I. Leather
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Amsterdam | 08/??/1889 | 0 | Netherlands |
Most Played Openings as White
| ECO | Opening | Games |
| A00 | Polish (Sokolsky) opening | 2 games |
| B23 | Sicilian, closed | 1 games |
| C49 | Four knights, double Ruy Lopez | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| B06 | Robatsch (modern) defence | 1 games |
| C53 | Giuoco Piano | 1 games |
| B00 | King's pawn opening | 1 games |


Netherlands