J. Piersma
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Alkmaar ACCOM op | ??/??/1993 | 0 | Netherlands |
| Alkmaar ACCOM op | ??/??/1992 | 75 | Netherlands |
| Haarlem ACCOM op | ??/??/1991 | 245 | Netherlands |
| ACCOM op2 | ??/??/1990 | 0 | Netherlands |
Most Played Openings as White
| ECO | Opening | Games |
| E83 | King's Indian, Saemisch, 6...Nc6 | 2 games |
| D58 | Queen's Gambit Declined, Tartakower (Makagonov-Bondarevsky) system | 1 games |
| A85 | Dutch with c4 & Nc3 | 1 games |
| E14 | Queen's Indian, 4.e3 | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| D53 | Queen's Gambit Declined, 4.Bg5 Be7 | 2 games |
| C02 | French, advance variation | 2 games |
| C11 | French defence | 2 games |
| A28 | English, four knights system | 2 games |


Netherlands