Pieter Jongsma
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| WchT U26 11th fin-B | 07/18/1964 | 0 | Poland |
| WchT U26 11th qual-A | 07/18/1964 | 0 | Poland |
Most Played Openings as White
| ECO | Opening | Games |
| E70 | King's Indian, 4.e4 | 1 games |
| A03 | Bird's opening | 1 games |
| A04 | Reti opening | 1 games |
| E61 | King's Indian defence, 3.Nc3 | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| E33 | Nimzo-Indian, classical, 4...Nc6 | 1 games |
| B24 | Sicilian, closed | 1 games |
| B25 | Sicilian, closed | 1 games |
| B75 | Sicilian, dragon, Yugoslav attack | 1 games |


Poland