Deyan Samuil Kostov
Country
BUL
Birth Year
2006
Gender
M
Title
FIDE Master
FIDE ID
30909015
FIDE Rating
2320
FIDE Rating Graph
Games
| # | Date | Event | Site | Round | White | Black | Result | Moves | View |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2025-11-27 | 1st 3-0 Thu 27th Nov 2025 | chess.com INT | 5 | Deyan Samuil Kostov | Vidip Kona | 0-1 | 47 | Open |
| 2 | 2025-11-27 | 1st 3-0 Thu 27th Nov 2025 | chess.com INT | 4 | Deyan Samuil Kostov | Timur Nurzhanov | 1-0 | 44 | Open |
| 3 | 2025-11-27 | 1st 3-0 Thu 27th Nov 2025 | chess.com INT | 3 | Dmitriy Kushko | Deyan Samuil Kostov | 1-0 | 27 | Open |
| 4 | 2025-11-27 | 1st 3-0 Thu 27th Nov 2025 | chess.com INT | 2 | Zsigmond Szajbely | Deyan Samuil Kostov | 0-1 | 41 | Open |
| 5 | 2025-11-27 | 1st 3-0 Thu 27th Nov 2025 | chess.com INT | 1 | Deyan Samuil Kostov | Matvey Galchenko | 0-1 | 31 | Open |
| 6 | 2025-10-03 | IV Mallorca Int. Masters | Inca ESP | 9.5 | Juan Alberto Gomez Aguirre | Deyan Samuil Kostov | 1-0 | 0 | Open |
| 7 | 2025-10-02 | IV Mallorca Int. Masters | Inca ESP | 8.2 | Deyan Samuil Kostov | Viktor Moskalenko | 1/2-1/2 | 39 | Open |
| 8 | 2025-10-02 | IV Mallorca Int. Masters | Inca ESP | 7.4 | Hristiyan Iliev | Deyan Samuil Kostov | 1-0 | 57 | Open |
| 9 | 2025-10-01 | IV Mallorca Int. Masters | Inca ESP | 6.3 | Deyan Samuil Kostov | Darius Zagorskis | 1/2-1/2 | 18 | Open |
| 10 | 2025-10-01 | IV Mallorca Int. Masters | Inca ESP | 5.3 | Ilmars Starostits | Deyan Samuil Kostov | 0-1 | 48 | Open |
| 11 | 2025-09-30 | IV Mallorca Int. Masters | Inca ESP | 4.4 | Deyan Samuil Kostov | Juan David Becerra | 1-0 | 71 | Open |
| 12 | 2025-09-30 | IV Mallorca Int. Masters | Inca ESP | 3.2 | Deniman Mamani Beltran | Deyan Samuil Kostov | 1-0 | 77 | Open |
| 13 | 2025-09-29 | IV Mallorca Int. Masters | Inca ESP | 2.5 | Deyan Samuil Kostov | Daniel Martin Rueda | 1-0 | 26 | Open |
| 14 | 2025-09-28 | IV Mallorca Int. Masters | Inca ESP | 1.1 | Deyan Samuil Kostov | Abdessadek Maalla | 1-0 | 39 | Open |
| 15 | 2025-08-17 | 6th Paul Keres Rapid 2025 | Parnu EST | 7.6 | Deyan Samuil Kostov | Arturs Neiksans | 0-1 | 40 | Open |
| 16 | 2025-08-17 | 6th Paul Keres Rapid 2025 | Parnu EST | 6.8 | Renars Muzis | Deyan Samuil Kostov | 1/2-1/2 | 26 | Open |
| 17 | 2025-08-17 | 6th Paul Keres Rapid 2025 | Parnu EST | 5.11 | Deyan Samuil Kostov | Kristaps Krustkalns | 1-0 | 48 | Open |
| 18 | 2025-08-16 | 6th Paul Keres Open A | Parnu EST | 9.9 | Ilja Haitin | Deyan Samuil Kostov | 1-0 | 87 | Open |
| 19 | 2025-08-15 | 6th Paul Keres Open A | Parnu EST | 8.7 | Deyan Samuil Kostov | Yury Lapshun | 1/2-1/2 | 52 | Open |
| 20 | 2025-08-15 | 6th Paul Keres Open A | Parnu EST | 7.7 | Deyan Samuil Kostov | Reinis Valdats | 1/2-1/2 | 27 | Open |
| 21 | 2025-08-14 | 6th Paul Keres Open A | Parnu EST | 6.7 | Henri Lahdelma | Deyan Samuil Kostov | 1/2-1/2 | 50 | Open |
| 22 | 2025-08-13 | 6th Paul Keres Open A | Parnu EST | 4.7 | Deniss Andrijashkin | Deyan Samuil Kostov | 1-0 | 43 | Open |
| 23 | 2025-08-12 | 6th Paul Keres Open A | Parnu EST | 3.11 | Deyan Samuil Kostov | Akaki Shalamberidze | 1-0 | 65 | Open |
| 24 | 2025-08-12 | 6th Paul Keres Open A | Parnu EST | 2.7 | Lorenz Wuethrich | Deyan Samuil Kostov | 1/2-1/2 | 32 | Open |
| 25 | 2025-08-11 | 6th Paul Keres Open A | Parnu EST | 1.1 | Deyan Samuil Kostov | Niko Rosenboom | 1-0 | 60 | Open |
| 26 | 2025-06-17 | Titled Tue 17th Jun Late | chess.com INT | 8 | Deyan Samuil Kostov | Giovanni Marchesich | 0-1 | 45 | Open |
| 27 | 2025-06-17 | Titled Tue 17th Jun Late | chess.com INT | 7 | Jose Felix Calvo Gonzalez | Deyan Samuil Kostov | 0-1 | 57 | Open |
| 28 | 2025-06-17 | Titled Tue 17th Jun Late | chess.com INT | 6 | Deyan Samuil Kostov | Ngoc Truong Son Nguyen | 0-1 | 46 | Open |
| 29 | 2025-06-17 | Titled Tue 17th Jun Late | chess.com INT | 5 | Deyan Samuil Kostov | Batyrkhan Muratov | 1-0 | 32 | Open |
| 30 | 2025-06-17 | Titled Tue 17th Jun Late | chess.com INT | 4 | Miguel Medina Paz | Deyan Samuil Kostov | 0-1 | 40 | Open |
| 31 | 2025-06-17 | Titled Tue 17th Jun Late | chess.com INT | 3 | Deyan Samuil Kostov | Leonardo Maglioni | 0-1 | 25 | Open |
| 32 | 2025-06-17 | Titled Tue 17th Jun Late | chess.com INT | 2 | David Paravyan | Deyan Samuil Kostov | 1-0 | 40 | Open |
| 33 | 2025-06-17 | Titled Tue 17th Jun Late | chess.com INT | 1 | Mariia Dolinskaia | Deyan Samuil Kostov | 0-1 | 44 | Open |
| 34 | 2025-06-14 | 3rd Munich Whitsun Open A | Munich GER | 9.7 | Anton Demchenko | Deyan Samuil Kostov | 1-0 | 53 | Open |
| 35 | 2025-06-13 | 3rd Munich Whitsun Open A | Munich GER | 8.16 | Prishita Gupta | Deyan Samuil Kostov | 0-1 | 39 | Open |
| 36 | 2025-06-12 | 3rd Munich Whitsun Open A | Munich GER | 7.7 | Deyan Samuil Kostov | Vitaliy Bernadskiy | 0-1 | 35 | Open |
| 37 | 2025-06-11 | 3rd Munich Whitsun Open A | Munich GER | 6.15 | Carlos Alvarez Serrano | Deyan Samuil Kostov | 0-1 | 64 | Open |
| 38 | 2025-06-10 | 3rd Munich Whitsun Open A | Munich GER | 5.24 | Deyan Samuil Kostov | Aarav Sarbalia | 1-0 | 43 | Open |
| 39 | 2025-06-09 | 3rd Munich Whitsun Open A | Munich GER | 4.2 | Nandish V S | Deyan Samuil Kostov | 1/2-1/2 | 51 | Open |
| 40 | 2025-06-09 | 3rd Munich Whitsun Open A | Munich GER | 3.2 | Deyan Samuil Kostov | Eltaj Safarli | 0-1 | 79 | Open |
| 41 | 2025-06-08 | 3rd Munich Whitsun Open A | Munich GER | 2.2 | Fiona Sieber | Deyan Samuil Kostov | 0-1 | 35 | Open |
| 42 | 2025-06-08 | 3rd Munich Whitsun Open A | Munich GER | 1.3 | Deyan Samuil Kostov | Darshan G | 1-0 | 42 | Open |
| 43 | 2025-05-20 | Titled Tue 20th May Early | chess.com INT | 1 | Juan Alejandro Leon Acevedo | Deyan Samuil Kostov | 1-0 | 32 | Open |
| 44 | 2025-04-27 | IV Menorca Open A 2025 | Ciutadella de Menorca ESP | 9.23 | Deyan Samuil Kostov | Jonasz Baum | 0-1 | 71 | Open |
| 45 | 2025-04-26 | IV Menorca Open A 2025 | Ciutadella de Menorca ESP | 8.16 | Deyan Samuil Kostov | Sebastian Dario Iermito | 1/2-1/2 | 40 | Open |
| 46 | 2025-04-26 | IV Menorca Open A 2025 | Ciutadella de Menorca ESP | 7.13 | Andy Woodward | Deyan Samuil Kostov | 1/2-1/2 | 54 | Open |
| 47 | 2025-04-25 | IV Menorca Open A 2025 | Ciutadella de Menorca ESP | 6.9 | Deyan Samuil Kostov | Viktor Matviishen | 1/2-1/2 | 32 | Open |
| 48 | 2025-04-23 | IV Menorca Open A 2025 | Ciutadella de Menorca ESP | 3.22 | Zhandos Agmanov | Deyan Samuil Kostov | 1/2-1/2 | 47 | Open |
| 49 | 2025-04-23 | IV Menorca Open A 2025 | Ciutadella de Menorca ESP | 2.27 | Deyan Samuil Kostov | Jose Fernando Cuenca Jimenez | 1-0 | 91 | Open |
| 50 | 2025-03-15 | 24th OGD Rapid 2025 | Delft NED | 7.2 | Alexandre Dgebuadze | Deyan Samuil Kostov | 1/2-1/2 | 7 | Open |
| 51 | 2025-03-15 | 24th OGD Rapid 2025 | Delft NED | 6.4 | Deyan Samuil Kostov | Manuel Bosboom | 1-0 | 43 | Open |
| 52 | 2025-03-15 | 24th OGD Rapid 2025 | Delft NED | 5.4 | Liam Vrolijk | Deyan Samuil Kostov | 0-1 | 31 | Open |
| 53 | 2025-03-15 | 24th OGD Rapid 2025 | Delft NED | 2.3 | Deyan Samuil Kostov | Velimir Ivic | 0-1 | 47 | Open |
| 54 | 2025-03-11 | Titled Tue 11th Mar Early | chess.com INT | 8 | Santiago Avila Pavas | Deyan Samuil Kostov | 1-0 | 48 | Open |
| 55 | 2025-03-11 | Titled Tue 11th Mar Early | chess.com INT | 7 | Deyan Samuil Kostov | Georgijs Germanovs | 1/2-1/2 | 123 | Open |
| 56 | 2025-03-11 | Titled Tue 11th Mar Early | chess.com INT | 6 | Kanan Garayev | Deyan Samuil Kostov | 1/2-1/2 | 78 | Open |
| 57 | 2025-03-11 | Titled Tue 11th Mar Early | chess.com INT | 5 | Deyan Samuil Kostov | Julian Antonio Rojas Alarcon | 1/2-1/2 | 53 | Open |
| 58 | 2025-03-11 | Titled Tue 11th Mar Early | chess.com INT | 4 | Deyan Samuil Kostov | Alexey Kovalchuk | 1-0 | 43 | Open |
| 59 | 2025-03-11 | Titled Tue 11th Mar Early | chess.com INT | 3 | William Coe | Deyan Samuil Kostov | 0-1 | 57 | Open |
| 60 | 2025-03-11 | Titled Tue 11th Mar Early | chess.com INT | 2 | Deyan Samuil Kostov | Judah Nathan Levitan | 1/2-1/2 | 60 | Open |
| 61 | 2025-03-11 | Titled Tue 11th Mar Early | chess.com INT | 1 | Almas Rakhmatullaev | Deyan Samuil Kostov | 1-0 | 36 | Open |
| 62 | 2025-03-04 | Titled Tue 4th Mar Early | chess.com INT | 7 | Aleksandra Goryachkina | Deyan Samuil Kostov | 1-0 | 88 | Open |
| 63 | 2025-03-04 | Titled Tue 4th Mar Early | chess.com INT | 6 | Luong Phuong Hanh | Deyan Samuil Kostov | 0-1 | 54 | Open |
| 64 | 2025-03-04 | Titled Tue 4th Mar Early | chess.com INT | 5 | Deyan Samuil Kostov | Kirill Kopjonkin | 1-0 | 45 | Open |
| 65 | 2025-03-04 | Titled Tue 4th Mar Early | chess.com INT | 4 | Deyan Samuil Kostov | Liam Putnam | 0-1 | 82 | Open |
| 66 | 2025-03-04 | Titled Tue 4th Mar Early | chess.com INT | 3 | Jose Garcia Molina | Deyan Samuil Kostov | 0-1 | 28 | Open |
| 67 | 2025-03-04 | Titled Tue 4th Mar Early | chess.com INT | 2 | Deyan Samuil Kostov | Jose Gabriel Casares Contreras | 1-0 | 15 | Open |
| 68 | 2025-03-04 | Titled Tue 4th Mar Early | chess.com INT | 1 | Ido Ben Artzi | Deyan Samuil Kostov | 1-0 | 33 | Open |
| 69 | 2025-02-04 | Titled Tue 4th Feb Early | chess.com INT | 5 | Deyan Samuil Kostov | Cristobal Henriquez Villagra | 0-1 | 34 | Open |
| 70 | 2025-02-04 | Titled Tue 4th Feb Early | chess.com INT | 4 | Deyan Samuil Kostov | Ivano Sundac | 1-0 | 56 | Open |
| 71 | 2025-02-04 | Titled Tue 4th Feb Early | chess.com INT | 3 | Hong Jun Lai | Deyan Samuil Kostov | 0-1 | 58 | Open |
| 72 | 2025-02-04 | Titled Tue 4th Feb Early | chess.com INT | 2 | Deyan Samuil Kostov | Alan Pichot | 0-1 | 57 | Open |
| 73 | 2025-02-04 | Titled Tue 4th Feb Early | chess.com INT | 1 | Ishvi Aggarwal | Deyan Samuil Kostov | 0-1 | 50 | Open |
| 74 | 2025-01-19 | Paracin Prestige Open | Paracin SRB | 9.3 | Deyan Samuil Kostov | Mohammad Al Saleh | 1-0 | 61 | Open |
| 75 | 2025-01-18 | Paracin Prestige Open | Paracin SRB | 8.1 | Junwei Xu | Deyan Samuil Kostov | 1-0 | 42 | Open |
| 76 | 2025-01-17 | Paracin Prestige Open | Paracin SRB | 7.3 | Deyan Samuil Kostov | Dejan Pikula | 1-0 | 34 | Open |
| 77 | 2025-01-16 | Paracin Prestige Open | Paracin SRB | 6.2 | Matei-Teodor Dodoi | Deyan Samuil Kostov | 1/2-1/2 | 42 | Open |
| 78 | 2025-01-15 | Paracin Prestige Open | Paracin SRB | 5.1 | Deyan Samuil Kostov | Haochen Jiang | 1/2-1/2 | 19 | Open |
| 79 | 2025-01-15 | Paracin Prestige Open | Paracin SRB | 4.1 | Bayarsaikhan Gundavaa | Deyan Samuil Kostov | 0-1 | 45 | Open |
| 80 | 2025-01-14 | Paracin Prestige Open | Paracin SRB | 3.1 | Deyan Samuil Kostov | Dejan Brankovic | 1/2-1/2 | 46 | Open |
| 81 | 2025-01-13 | Paracin Prestige Open | Paracin SRB | 2.4 | Aleksandar J Milosevic | Deyan Samuil Kostov | 0-1 | 39 | Open |
| 82 | 2025-01-11 | Paracin Prestige Open | Paracin SRB | 1.5 | Deyan Samuil Kostov | Slobodan D Radosavljevic | 1-0 | 39 | Open |
| 83 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 9 | Jegor Lashkin | Deyan Samuil Kostov | 1/2-1/2 | 47 | Open |
| 84 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 8 | Deyan Samuil Kostov | David Paravyan | 1-0 | 67 | Open |
| 85 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 7 | Fidel Corrales Jimenez | Deyan Samuil Kostov | 1-0 | 31 | Open |
| 86 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 6 | Deyan Samuil Kostov | Dmitry Goltsev | 1-0 | 67 | Open |
| 87 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 5 | Sediney Mari Da Silva Junior | Deyan Samuil Kostov | 0-1 | 38 | Open |
| 88 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 4 | Deyan Samuil Kostov | Bartosz Przybylski | 1-0 | 42 | Open |
| 89 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 3 | Arsen Kukhmazov | Deyan Samuil Kostov | 1-0 | 19 | Open |
| 90 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 2 | Deyan Samuil Kostov | Paul Rosales Campos | 1-0 | 56 | Open |
| 91 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 1 | Adan Alvarez Perez | Deyan Samuil Kostov | 1/2-1/2 | 66 | Open |
| 92 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 11 | Satria Duta Cahaya | Deyan Samuil Kostov | 0-1 | 69 | Open |
| 93 | 2025-01-07 | Titled Tue 7th Jan Late | chess.com INT | 10 | Deyan Samuil Kostov | Aleksey Dreev | 1/2-1/2 | 52 | Open |
| 94 | 2024-12-30 | Basel Christmas Open 2024 | Basel SUI | 8.7 | Deyan Samuil Kostov | Kenneth Hobson | 0-1 | 37 | Open |
| 95 | 2024-12-29 | Basel Christmas Open 2024 | Basel SUI | 7.3 | Andrei Shchekachev | Deyan Samuil Kostov | 1-0 | 40 | Open |
| 96 | 2024-12-29 | Basel Christmas Open 2024 | Basel SUI | 6.5 | Deyan Samuil Kostov | Selim Citak | 1-0 | 47 | Open |
| 97 | 2024-12-28 | Basel Christmas Open 2024 | Basel SUI | 5.9 | Deyan Samuil Kostov | Andreas Ciolek | 1-0 | 30 | Open |
| 98 | 2024-12-28 | Basel Christmas Open 2024 | Basel SUI | 4.2 | Matthieu Cornette | Deyan Samuil Kostov | 1-0 | 45 | Open |
| 99 | 2024-12-27 | Basel Christmas Open 2024 | Basel SUI | 3.6 | Deyan Samuil Kostov | Thomas Villiers | 1-0 | 60 | Open |
| 100 | 2024-12-27 | Basel Christmas Open 2024 | Basel SUI | 2.1 | Stefanos Kazantzoglou | Deyan Samuil Kostov | 1/2-1/2 | 71 | Open |
| 101 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 9 | Santiago Ospina Castro | Deyan Samuil Kostov | 0-1 | 56 | Open |
| 102 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 8 | Deyan Samuil Kostov | Cedric Chassard | 0-1 | 73 | Open |
| 103 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 7 | Carlos Alvarado | Deyan Samuil Kostov | 0-1 | 56 | Open |
| 104 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 6 | Tyrell Harriott | Deyan Samuil Kostov | 1-0 | 55 | Open |
| 105 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 5 | Deyan Samuil Kostov | Alisa Genrietta Yunker | 1/2-1/2 | 48 | Open |
| 106 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 4 | Deyan Samuil Kostov | Leonardo Cahuapaza Tarapaca | 1-0 | 57 | Open |
| 107 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 3 | Yasin Sari | Deyan Samuil Kostov | 1-0 | 55 | Open |
| 108 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 2 | Deyan Samuil Kostov | Marco Riehle | 0-1 | 52 | Open |
| 109 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 1 | Deyan Samuil Kostov | Marcel Winkels | 1-0 | 45 | Open |
| 110 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 11 | Deyan Samuil Kostov | Rafail Antoniou | 0-1 | 45 | Open |
| 111 | 2024-09-17 | Titled Tue 17th Sep Late | chess.com INT | 10 | Tiago Cunha Navarro | Deyan Samuil Kostov | 0-1 | 77 | Open |
| 112 | 2024-09-10 | Titled Tue 10th Sep Late | chess.com INT | 5 | Mariia Dolinskaia | Deyan Samuil Kostov | 1-0 | 39 | Open |
| 113 | 2024-09-10 | Titled Tue 10th Sep Late | chess.com INT | 4 | Deyan Samuil Kostov | Dario Alivodic | 1-0 | 30 | Open |
| 114 | 2024-09-10 | Titled Tue 10th Sep Late | chess.com INT | 3 | Djuro Skaric | Deyan Samuil Kostov | 1/2-1/2 | 74 | Open |
| 115 | 2024-09-10 | Titled Tue 10th Sep Late | chess.com INT | 2 | Deyan Samuil Kostov | Eduardo Gerbelli Neto | 1/2-1/2 | 52 | Open |
| 116 | 2024-09-10 | Titled Tue 10th Sep Late | chess.com INT | 1 | Conrad Thake | Deyan Samuil Kostov | 1-0 | 15 | Open |
| 117 | 2024-08-13 | Titled Tue 13th Aug Early | chess.com INT | 2 | Alberto Atoyan | Deyan Samuil Kostov | 1-0 | 39 | Open |
| 118 | 2024-08-13 | Titled Tue 13th Aug Early | chess.com INT | 1 | Deyan Samuil Kostov | Nikita Shandrygin | 0-1 | 38 | Open |
| 119 | 2024-08-11 | 13th Split Open 2024 | Split CRO | 10.4 | Masruri Rahman | Deyan Samuil Kostov | 1/2-1/2 | 1 | Open |
| 120 | 2024-08-10 | 13th Split Open 2024 | Split CRO | 9.1 | Eric Hansen | Deyan Samuil Kostov | 1-0 | 60 | Open |
| 121 | 2024-08-09 | 13th Split Open 2024 | Split CRO | 8.2 | Deyan Samuil Kostov | Aleksandr Volodin | 1/2-1/2 | 41 | Open |
| 122 | 2024-08-08 | 13th Split Open 2024 | Split CRO | 7.2 | Deyan Samuil Kostov | Novendra Priasmoro | 1-0 | 53 | Open |
| 123 | 2024-08-07 | 13th Split Open 2024 | Split CRO | 6.6 | Nomindalai Tumurbaatar | Deyan Samuil Kostov | 0-1 | 61 | Open |
| 124 | 2024-08-06 | 13th Split Open 2024 | Split CRO | 5.2 | Deyan Samuil Kostov | Jadranko Plenca | 0-1 | 74 | Open |
| 125 | 2024-08-05 | 13th Split Open 2024 | Split CRO | 4.5 | Mateusz Dubinski | Deyan Samuil Kostov | 0-1 | 33 | Open |
| 126 | 2024-08-04 | 13th Split Open 2024 | Split CRO | 3.7 | Deyan Samuil Kostov | Marin Grgantov | 1-0 | 34 | Open |
| 127 | 2024-08-04 | 13th Split Open 2024 | Split CRO | 2.9 | Kiril Kostov | Deyan Samuil Kostov | 0-1 | 70 | Open |
| 128 | 2024-08-03 | 13th Split Open 2024 | Split CRO | 1.11 | Deyan Samuil Kostov | Jonathan A Day | 1-0 | 57 | Open |
| 129 | 2024-07-14 | 5th Valencia Cuna Open | Valencia ESP | 9.9 | Julen Luis Arizmendi Martinez | Deyan Samuil Kostov | 1-0 | 58 | Open |
| 130 | 2024-07-11 | 5th Valencia Cuna Open | Valencia ESP | 6.1 | Deyan Samuil Kostov | Bartlomiej Niedbala | 0-1 | 39 | Open |
| 131 | 2024-07-09 | 5th Valencia Cuna Open | Valencia ESP | 4.6 | Deyan Samuil Kostov | Yuanhe Zhao | 1/2-1/2 | 67 | Open |
| 132 | 2024-06-23 | TCh-SUI 2024 | Switzerland SUI | 5.6 | Daniel Fischer | Deyan Samuil Kostov | 1-0 | 47 | Open |
| 133 | 2024-06-18 | Titled Tue 18th Jun Early | chess.com INT | 2 | Deyan Samuil Kostov | Turkan Mamedjarova | 0-1 | 38 | Open |
| 134 | 2024-06-18 | Titled Tue 18th Jun Early | chess.com INT | 1 | Zurab Javakhadze | Deyan Samuil Kostov | 1-0 | 53 | Open |
| 135 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 9 | Deyan Samuil Kostov | Shubhi Gupta | 1-0 | 47 | Open |
| 136 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 8 | Allahverdi Hamidov | Deyan Samuil Kostov | 1-0 | 34 | Open |
| 137 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 7 | Deyan Samuil Kostov | Marlon Jodar Arias | 1-0 | 39 | Open |
| 138 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 6 | Barlo A. Nadera | Deyan Samuil Kostov | 1-0 | 55 | Open |
| 139 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 5 | Deyan Samuil Kostov | Ivan Aldokhin | 0-1 | 36 | Open |
| 140 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 4 | Deyan Samuil Kostov | Aleksandra Goryachkina | 0-1 | 23 | Open |
| 141 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 3 | Atilla Eynullayev | Deyan Samuil Kostov | 0-1 | 54 | Open |
| 142 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 2 | Deyan Samuil Kostov | Richard Persson | 1-0 | 33 | Open |
| 143 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 1 | Dennis Wagner | Deyan Samuil Kostov | 1-0 | 51 | Open |
| 144 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 11 | Francesco Bettalli | Deyan Samuil Kostov | 0-1 | 38 | Open |
| 145 | 2024-05-28 | Titled Tue 28th May Early | chess.com INT | 10 | Deyan Samuil Kostov | Evgenij Shuvalov | 1-0 | 41 | Open |
| 146 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 9 | Ekaterina Goltseva | Deyan Samuil Kostov | 1/2-1/2 | 51 | Open |
| 147 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 8 | Nadya Toncheva | Deyan Samuil Kostov | 1/2-1/2 | 31 | Open |
| 148 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 7 | Deyan Samuil Kostov | Georgios Souleidis | 1/2-1/2 | 47 | Open |
| 149 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 6 | Eric Rosen | Deyan Samuil Kostov | 0-1 | 53 | Open |
| 150 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 5 | Deyan Samuil Kostov | Tamas Vanczak | 0-1 | 31 | Open |
| 151 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 4 | Diana Mirza | Deyan Samuil Kostov | 0-1 | 33 | Open |
| 152 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 3 | Deyan Samuil Kostov | Gulrukhbegim Tokhirjonova | 0-1 | 48 | Open |
| 153 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 2 | Nikita Matinian | Deyan Samuil Kostov | 0-1 | 42 | Open |
| 154 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 1 | Felix-Antonio Ilinca | Deyan Samuil Kostov | 1-0 | 60 | Open |
| 155 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 11 | Deyan Samuil Kostov | Kostya Kavutskiy | 1-0 | 35 | Open |
| 156 | 2024-05-21 | Titled Tue 21st May Early | chess.com INT | 10 | Deyan Samuil Kostov | Lenin Guerra Tulcan | 1-0 | 45 | Open |
| 157 | 2024-05-20 | 36th Geneva Open 2024 | Geneva SUI | 7.3 | R. Ashwath | Deyan Samuil Kostov | 1/2-1/2 | 31 | Open |
| 158 | 2024-05-20 | 36th Geneva Open 2024 | Geneva SUI | 6.4 | Deyan Samuil Kostov | Julien Joly | 1-0 | 62 | Open |
| 159 | 2024-05-18 | 36th Geneva Open 2024 | Geneva SUI | 3.4 | Samuel Malka | Deyan Samuil Kostov | 1-0 | 79 | Open |
| 160 | 2024-05-18 | 36th Geneva Open 2024 | Geneva SUI | 2.4 | Deyan Samuil Kostov | Manuel Lopez | 1-0 | 33 | Open |
| 161 | 2024-05-17 | 36th Geneva Open 2024 | Geneva SUI | 1.4 | Hugo Jelicic | Deyan Samuil Kostov | 0-1 | 44 | Open |
| 162 | 2024-04-01 | GRENKE Chess Open 2024 | Karlsruhe GER | 9.47 | Alex Krstulovic | Deyan Samuil Kostov | 0-1 | 59 | Open |
| 163 | 2024-04-01 | GRENKE Chess Open 2024 | Karlsruhe GER | 8.48 | Deyan Samuil Kostov | Leonid Milov | 1/2-1/2 | 27 | Open |
| 164 | 2024-03-30 | GRENKE Chess Open 2024 | Karlsruhe GER | 5.41 | Christopher Noe | Deyan Samuil Kostov | 1-0 | 67 | Open |
| 165 | 2024-03-30 | GRENKE Chess Open 2024 | Karlsruhe GER | 4.35 | Deyan Samuil Kostov | Philipp Schlosser | 1/2-1/2 | 38 | Open |
| 166 | 2024-02-04 | Basel Carnival Open 2024 | Basel SUI | 5.2 | Deyan Samuil Kostov | Harry Grieve | 1/2-1/2 | 32 | Open |
| 167 | 2024-02-04 | Basel Carnival Open 2024 | Basel SUI | 4.4 | Anuar Tureshbayev | Deyan Samuil Kostov | 0-1 | 63 | Open |
| 168 | 2024-02-03 | Basel Carnival Open 2024 | Basel SUI | 3.1 | Deyan Samuil Kostov | Himal Gusain | 1/2-1/2 | 56 | Open |
| 169 | 2024-02-03 | Basel Carnival Open 2024 | Basel SUI | 2.6 | Deyan Samuil Kostov | Helmut Locher | 1-0 | 32 | Open |
| 170 | 2024-02-02 | Basel Carnival Open 2024 | Basel SUI | 1.8 | Tim Betsche | Deyan Samuil Kostov | 0-1 | 21 | Open |
| 171 | 2024-01-02 | Titled Tue 2nd Jan Early | chess.com INT | 2 | Deyan Samuil Kostov | Gerardo Fernandez Hernandez | 0-1 | 14 | Open |
| 172 | 2024-01-02 | Titled Tue 2nd Jan Early | chess.com INT | 1 | Daniel Dardha | Deyan Samuil Kostov | 1-0 | 33 | Open |
| 173 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 9 | Deyan Samuil Kostov | Ward Al-Tarboush | 0-1 | 59 | Open |
| 174 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 8 | John Merriman | Deyan Samuil Kostov | 0-1 | 50 | Open |
| 175 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 7 | Jain Jeet | Deyan Samuil Kostov | 1-0 | 38 | Open |
| 176 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 6 | Deyan Samuil Kostov | Andrei Skvortsov | 1/2-1/2 | 69 | Open |
| 177 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 5 | Deyan Samuil Kostov | Matthias Bluebaum | 0-1 | 67 | Open |
| 178 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 4 | Dejan Tasev | Deyan Samuil Kostov | 1/2-1/2 | 44 | Open |
| 179 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 3 | Deyan Samuil Kostov | Mihailo Djokic | 1-0 | 33 | Open |
| 180 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 2 | Deyan Samuil Kostov | Lianet Mercedes Diaz Garcia | 1-0 | 27 | Open |
| 181 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 1 | Kamil Dragun | Deyan Samuil Kostov | 1-0 | 63 | Open |
| 182 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 11 | Nagare Kaivalya Sandip | Deyan Samuil Kostov | 1-0 | 39 | Open |
| 183 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 10 | Lorenzo Perea Fruet | Deyan Samuil Kostov | 0-1 | 26 | Open |
| 184 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 9 | Asa Hoffmann | Deyan Samuil Kostov | 0-1 | 52 | Open |
| 185 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 8 | Deyan Samuil Kostov | Juan Carlos Mesa Cruz | 0-1 | 55 | Open |
| 186 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 7 | Deyan Samuil Kostov | Fabiano Caruana | 0-1 | 70 | Open |
| 187 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 6 | Mario Andres Fernandez Sanchez | Deyan Samuil Kostov | 0-1 | 85 | Open |
| 188 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 5 | Marius Fromm | Deyan Samuil Kostov | 1-0 | 48 | Open |
| 189 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 4 | Deyan Samuil Kostov | Thomas E Rendle | 1/2-1/2 | 53 | Open |
| 190 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 3 | Deyan Samuil Kostov | Dmitrij Skurikhin | 1-0 | 50 | Open |
| 191 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 2 | Arsen Kukhmazov | Deyan Samuil Kostov | 1-0 | 45 | Open |
| 192 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 1 | Deyan Samuil Kostov | Vitaliy Bernadskiy | 1/2-1/2 | 48 | Open |
| 193 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 11 | Mika Karttunen | Deyan Samuil Kostov | 1-0 | 25 | Open |
| 194 | 2023-12-19 | Titled Tue 19th Dec Early | chess.com INT | 10 | Deyan Samuil Kostov | Lile Koridze | 1-0 | 32 | Open |
| 195 | 2023-10-21 | Hvar Open 2023 | Hvar CRO | 9.7 | Deyan Samuil Kostov | Nathan Ronce | 1-0 | 36 | Open |
| 196 | 2023-10-20 | Hvar Open 2023 | Hvar CRO | 8.3 | Yixing Wu | Deyan Samuil Kostov | 1/2-1/2 | 30 | Open |
| 197 | 2023-10-19 | Hvar Open 2023 | Hvar CRO | 7.4 | Deyan Samuil Kostov | Deniz Ozen | 1/2-1/2 | 20 | Open |
| 198 | 2023-10-18 | Hvar Open 2023 | Hvar CRO | 6.9 | Jon Underwood | Deyan Samuil Kostov | 0-1 | 36 | Open |
| 199 | 2023-10-18 | Hvar Open 2023 | Hvar CRO | 5.9 | Deyan Samuil Kostov | Ivan Ivancic | 1/2-1/2 | 84 | Open |
| 200 | 2023-10-17 | Hvar Open 2023 | Hvar CRO | 4.12 | Jakov Boric | Deyan Samuil Kostov | 0-1 | 56 | Open |
| 201 | 2023-10-16 | Hvar Open 2023 | Hvar CRO | 3.9 | Deyan Samuil Kostov | Ergit Ramaj | 0-1 | 59 | Open |
| 202 | 2023-10-16 | Hvar Open 2023 | Hvar CRO | 2.11 | Zain Patel | Deyan Samuil Kostov | 0-1 | 36 | Open |
| 203 | 2023-10-15 | Hvar Open 2023 | Hvar CRO | 1.12 | Deyan Samuil Kostov | Klara Begic | 1-0 | 45 | Open |
| 204 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 9 | Deyan Samuil Kostov | Raset Ziatdinov | 1-0 | 78 | Open |
| 205 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 8 | Thi Bao Tram Hoang | Deyan Samuil Kostov | 1-0 | 56 | Open |
| 206 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 7 | Deyan Samuil Kostov | Ilya Gutkin | 1-0 | 76 | Open |
| 207 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 6 | Havard Haug | Deyan Samuil Kostov | 1-0 | 50 | Open |
| 208 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 5 | Deyan Samuil Kostov | Hui Li | 1-0 | 47 | Open |
| 209 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 4 | Han Schut | Deyan Samuil Kostov | 0-1 | 42 | Open |
| 210 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 3 | Deyan Samuil Kostov | Miguel Angel Mateos Rozas | 0-1 | 52 | Open |
| 211 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 2 | Roman Zhenetl | Deyan Samuil Kostov | 1-0 | 68 | Open |
| 212 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 1 | Alexander Rustemov | Deyan Samuil Kostov | 1/2-1/2 | 49 | Open |
| 213 | 2023-08-22 | Titled Tue 22nd Aug Early | chess.com INT | 10 | Uurtsaikh Agibileg | Deyan Samuil Kostov | 1-0 | 21 | Open |
| 214 | 2023-08-13 | 12th Split Open 2023 | Split CRO | 9.2 | Deyan Samuil Kostov | Kiril Kostov | 1-0 | 1 | Open |
| 215 | 2023-08-12 | 12th Split Open 2023 | Split CRO | 8.9 | Lovro Novosel | Deyan Samuil Kostov | 1-0 | 47 | Open |
| 216 | 2023-08-11 | 12th Split Open 2023 | Split CRO | 7.1 | Deyan Samuil Kostov | Daniel Kopylov | 1/2-1/2 | 34 | Open |
| 217 | 2023-08-09 | 12th Split Open 2023 | Split CRO | 6.17 | Darko Kurtovic | Deyan Samuil Kostov | 0-1 | 47 | Open |
| 218 | 2023-08-08 | 12th Split Open 2023 | Split CRO | 5.4 | Deyan Samuil Kostov | Mladen Palac | 0-1 | 44 | Open |
| 219 | 2023-08-07 | 12th Split Open 2023 | Split CRO | 4.16 | Ivan Rasic | Deyan Samuil Kostov | 0-1 | 57 | Open |
| 220 | 2023-08-06 | 12th Split Open 2023 | Split CRO | 3.16 | Deyan Samuil Kostov | Matija Sakic | 1/2-1/2 | 40 | Open |
| 221 | 2023-07-11 | Titled Tue 11th Jul Early | chess.com INT | 4 | Tymur Keleberda | Deyan Samuil Kostov | 1-0 | 103 | Open |
| 222 | 2023-07-11 | Titled Tue 11th Jul Early | chess.com INT | 3 | Wojciech Przybylski | Deyan Samuil Kostov | 1-0 | 39 | Open |
| 223 | 2023-07-11 | Titled Tue 11th Jul Early | chess.com INT | 2 | Deyan Samuil Kostov | Anna Kubicka | 1-0 | 33 | Open |
| 224 | 2023-07-11 | Titled Tue 11th Jul Early | chess.com INT | 1 | Christos Krallis | Deyan Samuil Kostov | 1-0 | 47 | Open |
| 225 | 2023-05-13 | TCh-SUI 2023 | Switzerland SUI | 3.8 | Jose Ruiz | Deyan Samuil Kostov | 0-1 | 21 | Open |
| 226 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 9 | Martin Horak | Deyan Samuil Kostov | 0-1 | 40 | Open |
| 227 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 8 | Deyan Samuil Kostov | Dana Tuleyeva-Aketayeva | 1-0 | 49 | Open |
| 228 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 7 | Vladimir Goncharov | Deyan Samuil Kostov | 1-0 | 60 | Open |
| 229 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 6 | Pawel Flis | Deyan Samuil Kostov | 1/2-1/2 | 59 | Open |
| 230 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 5 | Deyan Samuil Kostov | Krishnan P. Saravana | 1/2-1/2 | 74 | Open |
| 231 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 4 | Aziz Degenbaev | Deyan Samuil Kostov | 1-0 | 27 | Open |
| 232 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 3 | Francisco Fiorito | Deyan Samuil Kostov | 0-1 | 68 | Open |
| 233 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 2 | Deyan Samuil Kostov | Bartosz Sowul | 0-1 | 36 | Open |
| 234 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 1 | Deyan Samuil Kostov | Karthik Rajaa | 0-1 | 55 | Open |
| 235 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 11 | Deyan Samuil Kostov | Sergei Ljukin | 1-0 | 58 | Open |
| 236 | 2023-04-18 | Titled Tue 18th Apr Early | chess.com INT | 10 | Maksim Omariev | Deyan Samuil Kostov | 0-1 | 44 | Open |
| 237 | 2023-04-16 | Dimitrovgrad Spring Vac | Dimitrovgrad SRB | 9.1 | Deyan Samuil Kostov | Nikolaos Koutlas | 1-0 | 33 | Open |
| 238 | 2023-04-15 | Dimitrovgrad Spring Vac | Dimitrovgrad SRB | 8.2 | Jonathan Pein | Deyan Samuil Kostov | 0-1 | 72 | Open |
| 239 | 2023-04-15 | Dimitrovgrad Spring Vac | Dimitrovgrad SRB | 7.1 | Deyan Samuil Kostov | Jordan Ivanov | 1/2-1/2 | 9 | Open |
| 240 | 2023-04-14 | Dimitrovgrad Spring Vac | Dimitrovgrad SRB | 6.3 | Zvonko Stanojoski | Deyan Samuil Kostov | 1-0 | 66 | Open |
| 241 | 2023-04-14 | Dimitrovgrad Spring Vac | Dimitrovgrad SRB | 5.3 | Deyan Samuil Kostov | Biser Georgiev | 1/2-1/2 | 56 | Open |
| 242 | 2023-04-13 | Dimitrovgrad Spring Vac | Dimitrovgrad SRB | 4.3 | Boil Banov | Deyan Samuil Kostov | 1/2-1/2 | 52 | Open |
| 243 | 2023-04-12 | Dimitrovgrad Spring Vac | Dimitrovgrad SRB | 3.1 | Deyan Samuil Kostov | Elif Mehmed | 0-1 | 60 | Open |
| 244 | 2023-04-11 | Dimitrovgrad Spring Vac | Dimitrovgrad SRB | 1.1 | Deyan Samuil Kostov | Mikhail Bryakin | 1/2-1/2 | 36 | Open |
| 245 | 2023-04-01 | TCh-SUI SGM 2022-23 | Switzerland SUI | 7.8 | Marc, Dr. Schwierskott | Deyan Samuil Kostov | 1/2-1/2 | 42 | Open |
| 246 | 2023-03-14 | Titled Tue 14th Mar Late | chess.com INT | 9 | Deyan Samuil Kostov | John Curtis | 1-0 | 46 | Open |
| 247 | 2023-03-14 | Titled Tue 14th Mar Late | chess.com INT | 8 | Josefine Safarli | Deyan Samuil Kostov | 1-0 | 47 | Open |
| 248 | 2023-03-14 | Titled Tue 14th Mar Late | chess.com INT | 7 | Deyan Samuil Kostov | Mikhail Popov | 0-1 | 37 | Open |
| 249 | 2023-03-14 | Titled Tue 14th Mar Late | chess.com INT | 6 | Ansh M Shah | Deyan Samuil Kostov | 0-1 | 37 | Open |
| 250 | 2023-03-14 | Titled Tue 14th Mar Late | chess.com INT | 5 | Deyan Samuil Kostov | Sven Tica | 0-1 | 33 | Open |
| 251 | 2023-03-14 | Titled Tue 14th Mar Late | chess.com INT | 4 | Vugar Rasulov | Deyan Samuil Kostov | 1-0 | 76 | Open |
| 252 | 2023-03-14 | Titled Tue 14th Mar Late | chess.com INT | 3 | Deyan Samuil Kostov | Roman Gavrilin | 1/2-1/2 | 40 | Open |
| 253 | 2023-03-14 | Titled Tue 14th Mar Late | chess.com INT | 2 | Alexey Averjanov | Deyan Samuil Kostov | 1-0 | 38 | Open |
| 254 | 2023-03-14 | Titled Tue 14th Mar Late | chess.com INT | 1 | Deyan Samuil Kostov | Jose Fernando Cuenca Jimenez | 1-0 | 49 | Open |
| 255 | 2023-03-12 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 10.171 | Deyan Samuil Kostov | Lachezar Yordanov | 1/2-1/2 | 58 | Open |
| 256 | 2023-03-11 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 9.162 | Nenad Panic | Deyan Samuil Kostov | 1-0 | 52 | Open |
| 257 | 2023-03-10 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 8.165 | Deyan Samuil Kostov | Beloslava Krasteva | 1/2-1/2 | 23 | Open |
| 258 | 2023-03-09 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 7.167 | Nikola Marcetic | Deyan Samuil Kostov | 1/2-1/2 | 37 | Open |
| 259 | 2023-03-08 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 6.137 | Deyan Samuil Kostov | Slaven Pastar | 0-1 | 43 | Open |
| 260 | 2023-03-07 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 5.178 | Marko Ivanovic | Deyan Samuil Kostov | 0-1 | 51 | Open |
| 261 | 2023-03-06 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 4.145 | Deyan Samuil Kostov | Aleksandra Maltsevskaya | 0-1 | 29 | Open |
| 262 | 2023-03-05 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 3.146 | Milan Zajic | Deyan Samuil Kostov | 1/2-1/2 | 47 | Open |
| 263 | 2023-03-04 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 2.131 | Deyan Samuil Kostov | Jakob Leon Pajeken | 1/2-1/2 | 61 | Open |
| 264 | 2023-03-03 | 23rd ch-EUR Indiv 2023 | Vrnjacka Banja SRB | 1.144 | Nderim Saraci | Deyan Samuil Kostov | 1/2-1/2 | 35 | Open |
| 265 | 2023-01-23 | Paracin Prestige Open | Paracin SRB | 9.9 | Aleksa Petrovic | Deyan Samuil Kostov | 1-0 | 55 | Open |
| 266 | 2023-01-21 | Paracin Prestige Open | Paracin SRB | 7.7 | Milos Milosevic | Deyan Samuil Kostov | 1-0 | 58 | Open |
| 267 | 2023-01-18 | Paracin Prestige Open | Paracin SRB | 3.5 | Nikola Radovanovic | Deyan Samuil Kostov | 1-0 | 70 | Open |
| 268 | 2022-12-20 | 9th Sunway Sitges 2022 | Sitges ESP | 8.84 | Deyan Samuil Kostov | Hugo Uber Gracia | 1/2-1/2 | 87 | Open |
| 269 | 2022-12-19 | 9th Sunway Sitges 2022 | Sitges ESP | 7.87 | Victor Daniel Pousada Garcia | Deyan Samuil Kostov | 1/2-1/2 | 93 | Open |
| 270 | 2022-12-17 | 9th Sunway Sitges 2022 | Sitges ESP | 6.58 | Deyan Samuil Kostov | Phileas Mathieu | 0-1 | 44 | Open |
| 271 | 2022-12-16 | 9th Sunway Sitges 2022 | Sitges ESP | 5.89 | David Maloberti | Deyan Samuil Kostov | 0-1 | 61 | Open |
| 272 | 2022-12-15 | 9th Sunway Sitges 2022 | Sitges ESP | 4.5 | Deyan Samuil Kostov | Antoine Bournel | 0-1 | 84 | Open |
| 273 | 2022-12-14 | 9th Sunway Sitges 2022 | Sitges ESP | 3.93 | Jordi Comellas Blanchart | Deyan Samuil Kostov | 0-1 | 24 | Open |
| 274 | 2022-12-13 | 9th Sunway Sitges 2022 | Sitges ESP | 2.43 | Deyan Samuil Kostov | Yagiz Kaan Erdogmus | 0-1 | 40 | Open |
| 275 | 2022-10-16 | 44th Arco Open 2022 | Arco ITA | 9.5 | Deyan Samuil Kostov | Bendeguz Bodrogi | 1/2-1/2 | 26 | Open |
| 276 | 2022-10-15 | 44th Arco Open 2022 | Arco ITA | 8.7 | Peter Klings | Deyan Samuil Kostov | 1/2-1/2 | 41 | Open |
| 277 | 2022-10-14 | 44th Arco Open 2022 | Arco ITA | 7.3 | Deyan Samuil Kostov | Oleg Korneev | 1/2-1/2 | 19 | Open |
| 278 | 2022-10-13 | 44th Arco Open 2022 | Arco ITA | 6.3 | Deyan Samuil Kostov | Nikoloz Chkhaidze | 1-0 | 60 | Open |
| 279 | 2022-10-12 | 44th Arco Open 2022 | Arco ITA | 5.8 | Christian Salerno | Deyan Samuil Kostov | 0-1 | 22 | Open |
| 280 | 2022-10-11 | 44th Arco Open 2022 | Arco ITA | 4.1 | Deyan Samuil Kostov | Irakli Akhvlediani | 0-1 | 37 | Open |
| 281 | 2022-10-10 | 44th Arco Open 2022 | Arco ITA | 3.9 | Bence Bernath | Deyan Samuil Kostov | 0-1 | 60 | Open |
| 282 | 2022-10-09 | 44th Arco Open 2022 | Arco ITA | 2.9 | Deyan Samuil Kostov | Aron Csontos | 1-0 | 58 | Open |
| 283 | 2022-10-08 | 44th Arco Open 2022 | Arco ITA | 1.9 | Walter De Reymaeker | Deyan Samuil Kostov | 0-1 | 36 | Open |
| 284 | 2022-08-27 | GP Romania Stage 3 2022 | Miercurea Ciuc ROU | 8.2 | Balazs Pasztor | Deyan Samuil Kostov | 1-0 | 59 | Open |
| 285 | 2022-08-26 | GP Romania Stage 3 2022 | Miercurea Ciuc ROU | 7.19 | Deyan Samuil Kostov | Mircea Talu | 1/2-1/2 | 35 | Open |
| 286 | 2022-08-24 | GP Romania Stage 3 2022 | Miercurea Ciuc ROU | 5.16 | Ioan Cosma | Deyan Samuil Kostov | 1-0 | 50 | Open |
| 287 | 2022-08-23 | GP Romania Stage 3 2022 | Miercurea Ciuc ROU | 4.19 | Deyan Samuil Kostov | George Stoleriu | 1/2-1/2 | 46 | Open |
| 288 | 2022-08-22 | GP Romania Stage 3 2022 | Miercurea Ciuc ROU | 3.14 | Branko Tadic | Deyan Samuil Kostov | 1/2-1/2 | 57 | Open |
| 289 | 2022-08-20 | GP Romania Stage 3 2022 | Miercurea Ciuc ROU | 1.7 | Bence Korpa | Deyan Samuil Kostov | 1-0 | 33 | Open |
| 290 | 2022-07-22 | 11th Split Open 2022 | Split CRO | 7.14 | Deyan Samuil Kostov | Marin Denic | 1/2-1/2 | 29 | Open |
| 291 | 2022-07-18 | 11th Split Open 2022 | Split CRO | 4.5 | Deyan Samuil Kostov | Ivan Zaja | 1/2-1/2 | 31 | Open |
| 292 | 2022-07-17 | 11th Split Open 2022 | Split CRO | 3.4 | Sven Tica | Deyan Samuil Kostov | 0-1 | 25 | Open |
| 293 | 2022-07-09 | 5th Solta Open 2022 | Grohote CRO | 8.7 | Ivan Zaja | Deyan Samuil Kostov | 1-0 | 40 | Open |
| 294 | 2022-07-06 | 5th Solta Open 2022 | Grohote CRO | 5.6 | Deyan Samuil Kostov | Oliver Zierke | 0-1 | 67 | Open |
| 295 | 2022-07-04 | 5th Solta Open 2022 | Grohote CRO | 4.16 | Marin Denic | Deyan Samuil Kostov | 0-1 | 49 | Open |
| 296 | 2022-07-04 | 5th Solta Open 2022 | Grohote CRO | 3.2 | Deyan Samuil Kostov | Vladimir Jr. Bukal | 0-1 | 38 | Open |
| 297 | 2022-06-12 | TCh-SUI 2022 | Switzerland SUI | 3.7 | Deyan Samuil Kostov | Thomas Heerd | 0-1 | 51 | Open |
| 298 | 2022-05-28 | ch-SUI Bundesturnier TP-1 | Payerne SUI | 6.7 | Deyan Samuil Kostov | Markus Loeffler | 1/2-1/2 | 64 | Open |
| 299 | 2022-05-27 | ch-SUI Bundesturnier TP-1 | Payerne SUI | 3.1 | Christian Bauer | Deyan Samuil Kostov | 1-0 | 41 | Open |
| 300 | 2021-09-18 | Primorsko Open 2021 | Primorsko BUL | 6.3 | Deyan Samuil Kostov | Martin Petrov | 0-1 | 42 | Open |
| 301 | 2021-09-17 | Primorsko Open 2021 | Primorsko BUL | 5.9 | Krasimir Stefanov | Deyan Samuil Kostov | 0-1 | 43 | Open |
| 302 | 2021-09-16 | Primorsko Open 2021 | Primorsko BUL | 4.19 | Deyan Samuil Kostov | Petya Karaivanova | 1-0 | 28 | Open |
| 303 | 2021-09-15 | Primorsko Open 2021 | Primorsko BUL | 3.1 | Lachezar Yordanov | Deyan Samuil Kostov | 1-0 | 44 | Open |
| 304 | 2021-09-14 | Primorsko Open 2021 | Primorsko BUL | 2.13 | Deyan Samuil Kostov | Todor Georgiev | 1/2-1/2 | 17 | Open |
| 305 | 2021-08-08 | 30th Kavala Open 2021 | Kavala GRE | 9.2 | Deyan Samuil Kostov | Dimitrios Stoimenidis | 1/2-1/2 | 37 | Open |
| 306 | 2021-08-05 | 30th Kavala Open 2021 | Kavala GRE | 6.12 | Nikolas Theodorou | Deyan Samuil Kostov | 1-0 | 53 | Open |
| 307 | 2021-08-03 | 30th Kavala Open 2021 | Kavala GRE | 4.13 | Dimitris Alexakis | Deyan Samuil Kostov | 1-0 | 60 | Open |
| 308 | 2021-08-02 | 30th Kavala Open 2021 | Kavala GRE | 2.1 | Athanasios Mastrovasilis | Deyan Samuil Kostov | 1-0 | 52 | Open |
| 309 | 2021-07-09 | 14th Paracin Summer Open | Paracin SRB | 1.9 | Misratdin Iskandarov | Deyan Samuil Kostov | 1-0 | 46 | Open |
| 310 | 2021-07-06 | Serbia Chess Open 2021 | Belgrade SRB | 6.115 | Adela Velikic | Deyan Samuil Kostov | 1-0 | 32 | Open |
| 311 | 2021-07-05 | Serbia Chess Open 2021 | Belgrade SRB | 5.132 | Deyan Samuil Kostov | Radmila Kovacevic | 1/2-1/2 | 51 | Open |
| 312 | 2021-07-04 | Serbia Chess Open 2021 | Belgrade SRB | 4.95 | Harry Grieve | Deyan Samuil Kostov | 1-0 | 61 | Open |
| 313 | 2021-07-03 | Serbia Chess Open 2021 | Belgrade SRB | 3.125 | Deyan Samuil Kostov | Mihail Jordanov | 1/2-1/2 | 58 | Open |
| 314 | 2021-07-03 | Serbia Chess Open 2021 | Belgrade SRB | 2.92 | Srdjan Zakic | Deyan Samuil Kostov | 1/2-1/2 | 45 | Open |
| 315 | 2021-07-02 | Serbia Chess Open 2021 | Belgrade SRB | 1.7 | Deyan Samuil Kostov | Martin Stukan | 0-1 | 44 | Open |
| 316 | 2021-05-08 | Titled Arena May 8th 2021 | lichess.org INT | - | Cristian Camilo Soto | Deyan Samuil Kostov | 0-1 | 18 | Open |
| 317 | 2021-05-08 | Titled Arena May 8th 2021 | lichess.org INT | - | Ermes Espinosa Veloz | Deyan Samuil Kostov | 1-0 | 44 | Open |
| 318 | 2021-05-08 | Titled Arena May 8th 2021 | lichess.org INT | - | Deyan Samuil Kostov | Fruzsina Szente Varga | 1/2-1/2 | 63 | Open |
| 319 | 2021-05-08 | Titled Arena May 8th 2021 | lichess.org INT | - | Deyan Samuil Kostov | Orkun Efe Alumert | 0-1 | 41 | Open |
| 320 | 2021-01-30 | Paracin Winter Amateur | Paracin SRB | 3.7 | Konstantin Kandjolas | Deyan Samuil Kostov | 0-1 | 50 | Open |
| 321 | 2021-01-30 | Paracin Winter Amateur | Paracin SRB | 2.9 | Deyan Samuil Kostov | Matej Zvezdakoski | 1-0 | 23 | Open |
| 322 | 2021-01-29 | Paracin Winter Amateur | Paracin SRB | 1.1 | Nikola Velikov | Deyan Samuil Kostov | 0-1 | 26 | Open |
| 323 | 2020-10-18 | 42nd Arco Open 2020 | Arco ITA | 9.7 | Deyan Samuil Kostov | Pia Marie Ruzic | 1/2-1/2 | 23 | Open |
| 324 | 2020-10-17 | 42nd Arco Open 2020 | Arco ITA | 8.6 | Peter Dittmar | Deyan Samuil Kostov | 1/2-1/2 | 62 | Open |
| 325 | 2020-10-16 | 42nd Arco Open 2020 | Arco ITA | 7.9 | Deyan Samuil Kostov | Alessio De Santis | 1-0 | 46 | Open |
| 326 | 2020-10-15 | 42nd Arco Open 2020 | Arco ITA | 6.14 | Sergey Perman | Deyan Samuil Kostov | 1/2-1/2 | 27 | Open |
| 327 | 2020-10-14 | 42nd Arco Open 2020 | Arco ITA | 5.9 | Deyan Samuil Kostov | Benjamin Ruecker | 1/2-1/2 | 12 | Open |
| 328 | 2020-10-13 | 42nd Arco Open 2020 | Arco ITA | 4.21 | Giorgio Modena | Deyan Samuil Kostov | 0-1 | 44 | Open |
| 329 | 2020-10-12 | 42nd Arco Open 2020 | Arco ITA | 3.14 | Deyan Samuil Kostov | Davide Podetti | 1/2-1/2 | 30 | Open |
| 330 | 2020-10-11 | 42nd Arco Open 2020 | Arco ITA | 2.3 | Oleg M Romanishin | Deyan Samuil Kostov | 1/2-1/2 | 27 | Open |
| 331 | 2020-10-10 | 42nd Arco Open 2020 | Arco ITA | 1.31 | Deyan Samuil Kostov | Silvano Bortolotti | 1-0 | 34 | Open |
| 332 | 2020-09-20 | Primorsko Open 2020 | Primorsko BUL | 7.11 | Deyan Samuil Kostov | Petar Hristov | 1-0 | 40 | Open |
| 333 | 2020-09-19 | Primorsko Open 2020 | Primorsko BUL | 6.1 | Deyan Samuil Kostov | Ivan Karadzhov | 0-1 | 32 | Open |
| 334 | 2020-09-18 | Primorsko Open 2020 | Primorsko BUL | 5.14 | Nikola Neshev | Deyan Samuil Kostov | 0-1 | 16 | Open |
| 335 | 2020-09-17 | Primorsko Open 2020 | Primorsko BUL | 4.7 | Deyan Samuil Kostov | Nurgyul Salimova | 0-1 | 41 | Open |
| 336 | 2020-09-15 | Primorsko Open 2020 | Primorsko BUL | 2.13 | Deyan Samuil Kostov | Nikola Kolev | 1/2-1/2 | 48 | Open |
| 337 | 2019-10-12 | 41st Arco Open 2019 | Arco ITA | 9.3 | Giuseppe Voltolini | Deyan Samuil Kostov | 1-0 | 34 | Open |
| 338 | 2019-10-11 | 41st Arco Open 2019 | Arco ITA | 8.34 | Deyan Samuil Kostov | Corrado Astengo | 1/2-1/2 | 42 | Open |
| 339 | 2019-10-10 | 41st Arco Open 2019 | Arco ITA | 7.38 | Robert Behling | Deyan Samuil Kostov | 1/2-1/2 | 55 | Open |
| 340 | 2019-10-09 | 41st Arco Open 2019 | Arco ITA | 6.35 | Deyan Samuil Kostov | Rudi Knors | 1/2-1/2 | 31 | Open |
| 341 | 2019-10-08 | 41st Arco Open 2019 | Arco ITA | 5.32 | Carsten Wollenweber | Deyan Samuil Kostov | 1/2-1/2 | 37 | Open |
| 342 | 2019-10-07 | 41st Arco Open 2019 | Arco ITA | 4.3 | Deyan Samuil Kostov | Henrik Bolding Pedersen | 1/2-1/2 | 29 | Open |
| 343 | 2019-10-06 | 41st Arco Open 2019 | Arco ITA | 3.67 | Rodrigo Gael Perez Valero | Deyan Samuil Kostov | 0-1 | 35 | Open |
| 344 | 2019-10-04 | 41st Arco Open 2019 | Arco ITA | 1.96 | Justin Sarkar | Deyan Samuil Kostov | 1-0 | 36 | Open |
| 345 | 2018-10-21 | 40th Arco Open 2018 | Arco ITA | 9.25 | Robert Behling | Deyan Samuil Kostov | 1/2-1/2 | 2 | Open |
| 346 | 2018-10-20 | 40th Arco Open 2018 | Arco ITA | 8.3 | Deyan Samuil Kostov | Maurizio Bevilacqua | 1-0 | 34 | Open |
| 347 | 2018-10-19 | 40th Arco Open 2018 | Arco ITA | 7.23 | Deyan Samuil Kostov | Rudi Knors | 0-1 | 58 | Open |
| 348 | 2018-10-18 | 40th Arco Open 2018 | Arco ITA | 6.3 | Raymond Schneider | Deyan Samuil Kostov | 0-1 | 30 | Open |
| 349 | 2018-10-17 | 40th Arco Open 2018 | Arco ITA | 5.48 | Stefano Roversi | Deyan Samuil Kostov | 0-1 | 31 | Open |
| 350 | 2018-10-16 | 40th Arco Open 2018 | Arco ITA | 4.34 | Deyan Samuil Kostov | Sebastian Voelker | 0-1 | 54 | Open |
| 351 | 2018-10-15 | 40th Arco Open 2018 | Arco ITA | 3.28 | Stephane Reinert | Deyan Samuil Kostov | 1/2-1/2 | 87 | Open |
| 352 | 2018-10-13 | 40th Arco Open 2018 | Arco ITA | 1.5 | Oleg M Romanishin | Deyan Samuil Kostov | 1-0 | 48 | Open |
| 353 | 2018-06-22 | 4th ad Gredine Open 2018 | Ortisei ITA | 7.39 | Deyan Samuil Kostov | Harald Niederstaetter | 1-0 | 21 | Open |
| 354 | 2018-06-21 | 4th ad Gredine Open 2018 | Ortisei ITA | 6.36 | Axel, Dr. Fehr | Deyan Samuil Kostov | 1-0 | 22 | Open |
| 355 | 2018-06-20 | 4th ad Gredine Open 2018 | Ortisei ITA | 5.38 | Deyan Samuil Kostov | Hans Karl | 1/2-1/2 | 31 | Open |
| 356 | 2018-06-17 | 4th ad Gredine Open 2018 | Ortisei ITA | 2.37 | Werner Riebel | Deyan Samuil Kostov | 1-0 | 30 | Open |
| 357 | 2017-10-15 | 39th Arco Open 2017 | Arco ITA | 9.27 | Gabriele Oppici | Deyan Samuil Kostov | 0-1 | 34 | Open |
| 358 | 2017-10-14 | 39th Arco Open 2017 | Arco ITA | 8.42 | Deyan Samuil Kostov | Antonio Pipitone | 1-0 | 28 | Open |
| 359 | 2017-10-13 | 39th Arco Open 2017 | Arco ITA | 7.4 | Wolfgang Schaberg | Deyan Samuil Kostov | 1/2-1/2 | 34 | Open |
| 360 | 2017-10-12 | 39th Arco Open 2017 | Arco ITA | 6.44 | Deyan Samuil Kostov | Christoph, Dr. Haenisch | 1/2-1/2 | 30 | Open |
| 361 | 2017-10-11 | 39th Arco Open 2017 | Arco ITA | 5.44 | Lena Wisheckel | Deyan Samuil Kostov | 1/2-1/2 | 27 | Open |
| 362 | 2017-10-10 | 39th Arco Open 2017 | Arco ITA | 4.34 | Deyan Samuil Kostov | Florian Jung | 0-1 | 39 | Open |
| 363 | 2017-10-09 | 39th Arco Open 2017 | Arco ITA | 3.19 | Fabrizio Molina | Deyan Samuil Kostov | 1-0 | 34 | Open |
| 364 | 2017-10-08 | 39th Arco Open 2017 | Arco ITA | 2.25 | Deyan Samuil Kostov | Stefano Vezzani | 1/2-1/2 | 31 | Open |
| 365 | 2017-10-07 | 39th Arco Open 2017 | Arco ITA | 1.43 | Fritz Maurer | Deyan Samuil Kostov | 0-1 | 36 | Open |
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