Alexander Jongsma
Alexander Jongsma Repertoire with White pieces
| ECO | Opening | Games |
| A00 | Polish (Sokolsky) opening | 18 games |
| E61 | King's Indian defence, 3.Nc3 | 6 games |
| A04 | Reti opening | 4 games |
| C26 | Vienna, Falkbeer variation | 4 games |
Alexander Jongsma Repertoire with Black pieces
| ECO | Opening | Games |
| B29 | Sicilian, Nimzovich-Rubinstein variation | 13 games |
| B27 | Sicilian defence | 8 games |
| A54 | Old Indian, Ukrainian variation | 7 games |
| B33 | Sicilian defence | 7 games |
NETHERLANDS

