International master Ricardo De Guzman of the Philippines scored a hat trick between Sept. 15 and Oct. 7, winning three Northern California tournaments in four weeks. At the Mechanics’ Institute Howard Donnelly Memorial, the Sacramento Chess Club Weekend Swiss No. 7, and the LERA Sunnyvale Championship , De Guzman won 11 games (six against masters) against no losses and one draw with 1763-rated Yefim Bukh in the last round of the Donnelly.