Juan Carlos Klein
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| ARG-ch | ??/??/1963 | 0 | Argentina |
| Fortaleza zt | ??/??/1963 | 0 | Brazil |
| ARG-ch playoff | ??/??/1963 | 0 | Argentina |
| Santa Fe | ??/??/1961 | 0 | United States |
Most Played Openings as White
| ECO | Opening | Games |
| B28 | Sicilian, O'Kelly variation | 2 games |
| B32 | Sicilian defence | 2 games |
| B94 | Sicilian, Najdorf, 6.Bg5 | 2 games |
| B00 | King's pawn opening | 2 games |
Most Played Openings as Black
| ECO | Opening | Games |
| A65 | Benoni, 6.e4 | 4 games |
| A66 | Benoni, pawn storm variation | 2 games |
| A60 | Benoni defence | 1 games |
| B41 | Sicilian, Kan variation | 1 games |


Argentina
Brazil
United States