Nikolai Kostov
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| BUL-ch Veterans | 05/05/2007 | 1409 |  Bulgaria |
| Baharov mem 13th | 11/25/2005 | 1886 | Bulgaria |
| Grigorov mem 3rd | 12/10/2004 | 1561 | Bulgaria |
| Sofia Hemus op 15th | 10/09/2004 | 2011 | Bulgaria |
Most Played Openings as White
| ECO | Opening | Games |
| A19 | English, Mikenas-Carls, Sicilian variation | 1 games |
| A53 | Old Indian defence | 1 games |
| B38 | Sicilian, accelerated fianchetto, Maroczy bind, 6.Be3 | 1 games |
| A28 | English, four knights system | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| C15 | French, Winawer (Nimzovich) variation | 1 games |
| C06 | French, Tarrasch, closed variation, main line | 1 games |
| E02 | Catalan, open, 5.Qa4 | 1 games |
| E90 | King's Indian, 5.Nf3 | 1 games |
