Martin Owen Costley
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| BCF-chT2 0708 (4NCL) | 09/15/2007 | 2156 |  United Kingdom |
| Hastings Challengers | 12/29/1999 | 2112 | United Kingdom |
| Sutton op | ??/??/1999 | 2003 | United Kingdom |
Martin Owen Costley Repertoire with White pieces (most played)
| ECO | Opening | Games |
| D15 | Queen's Gambit Declined Slav, 4.Nc3 | 1 games |
| E43 | Nimzo-Indian, Fischer variation | 1 games |
| C15 | French, Winawer (Nimzovich) variation | 1 games |
| A58 | Benko gambit accepted | 1 games |
Martin Owen Costley Repertoire with Black pieces (most played)
| ECO | Opening | Games |
| B12 | Caro-Kann defence | 1 games |
| C12 | French, MacCutcheon variation | 1 games |
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