Bulgaria
Male
FIDE ID:
Deyan Samuil Kostov
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| 6th Paul Keres Open A | 08/11/2025 | 2246 |  Estonia |
| 3rd Munich Whitsun Open A | 06/08/2025 | 2275 |  Germany |
| IV Menorca Open A 2025 | 04/22/2025 | 2391 |  Spain |
| Basel Christmas Open 2024 | 12/26/2024 | 2232 |  Switzerland |
Deyan Samuil Kostov Opening Repertoire with White pieces
| ECO | Opening | Games |
| D35 | Queen's Gambit Declined, 3...Nf6 | 6 games |
| A45 | Queen's pawn game | 6 games |
| E48 | Nimzo-Indian, 4.e3 O-O, 5.Bd3 d5 | 4 games |
| E49 | Nimzo-Indian, 4.e3, Botvinnik system | 3 games |
Deyan Samuil Kostov Opening Repertoire with Black pieces
| ECO | Opening | Games |
| B48 | Sicilian, Taimanov variation | 5 games |
| D02 | Queen's pawn game | 4 games |
| D27 | Queen's Gambit Accepted, classical, 6...a6 | 4 games |
| B40 | Sicilian defence | 3 games |
