Jonsson
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Avesta op | ??/??/1993 | 815 | Sweden |
| ISL-ch | ??/??/1980 | 1365 | Iceland |
| US op | ??/??/1977 | 178 | United States |
| Stockholm op | ??/??/1972 | 0 | Sweden |
Most Played Openings as White
| ECO | Opening | Games |
| B32 | Sicilian defence | 1 games |
| B38 | Sicilian, accelerated fianchetto, Maroczy bind, 6.Be3 | 1 games |
| A22 | English opening | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| C18 | French, Winawer, advance variation | 2 games |
| B93 | Sicilian, Najdorf, 6.f4 | 1 games |
| B92 | Sicilian, Najdorf, Opovcensky variation | 1 games |


Sweden
Iceland
United States