Halldor Jonsson
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| ISL-ch | ??/??/1972 | 0 | Iceland |
| ISL-ch | ??/??/1969 | 0 | Iceland |
Most Played Openings as White
| ECO | Opening | Games |
| B25 | Sicilian, closed | 2 games |
| E34 | Nimzo-Indian, classical, Noa variation | 1 games |
| E60 | King's Indian defence | 1 games |
| E01 | Catalan, closed | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| B23 | Sicilian, closed | 1 games |
| E30 | Nimzo-Indian, Leningrad variation | 1 games |
| B02 | Alekhine's defence | 1 games |
| A14 | English, Neo-Catalan declined | 1 games |


Iceland