William Batista Arruda
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Paulista-ch | 06/30/2005 | 1687 | Brazil |
| Pan American-ch U18 | 06/11/2005 | 1562 | Brazil |
| Paulista U20 | 02/14/2004 | 358 | Brazil |
| Itau Cup 8th | 09/04/2004 | 1562 | Brazil |
Most Played Openings as White
| ECO | Opening | Games |
| A04 | Reti opening | 3 games |
| B25 | Sicilian, closed | 2 games |
| B50 | Sicilian | 2 games |
| B89 | Sicilian, Sozin, 7.Be3 | 2 games |
Most Played Openings as Black
| ECO | Opening | Games |
| B76 | Sicilian, dragon, Yugoslav attack, 7...O-O | 3 games |
| E69 | King's Indian, fianchetto, classical main line | 2 games |
| B79 | Sicilian, dragon, Yugoslav attack, 12.h4 | 2 games |
| E94 | King's Indian, orthodox variation | 2 games |


Brazil