Ronald Weyerstrass
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| W/EU-ch U20 7677 | 12/??/1976 | 676 | Netherlands |
| Blaricum m2 | ??/??/1974 | 0 | Netherlands |
| Huizen m | ??/??/1974 | 0 | Netherlands |
| Blaricum m1 | ??/??/1974 | 0 | Netherlands |
Most Played Openings as White
| ECO | Opening | Games |
| A63 | Benoni, fianchetto, 9...Nbd7 | 4 games |
| D46 | Queen's Gambit Declined semi-Slav, 6.Bd3 | 3 games |
| A16 | English opening | 2 games |
| A26 | English, closed system | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| C01 | French, exchange variation | 2 games |
| A14 | English, Neo-Catalan declined | 2 games |
| E37 | Nimzo-Indian, classical, Noa variation, main line, 7.Qc2 | 2 games |
| A41 | Queen's Pawn | 2 games |


Netherlands