GJ. Martin
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Porz op 27th | ??/??/1991 | 501 |  Germany |
| Hoogovens-C | ??/??/1956 | 0 |  Netherlands |
| BCF-ch | 08/??/1955 | 0 |  United Kingdom |
| Beverwijk-B | ??/??/1955 | 0 | Netherlands |
GJ. Martin Opening Repertoire with White pieces
| ECO | Opening | Games |
| C27 | Vienna game | 1 games |
| B00 | King's pawn opening | 1 games |
| D88 | Gruenfeld, Spassky variation, main line, 10...cd, 11.cd | 1 games |
GJ. Martin Opening Repertoire with Black pieces
| ECO | Opening | Games |
| A52 | Budapest defence | 2 games |
| D05 | Queen's pawn game | 1 games |
| B91 | Sicilian, Najdorf, Zagreb (fianchetto) variation | 1 games |
| D30 | Queen's gambit declined | 1 games |
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