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David B. Weller's first chess engine, written in C and compliant to the Chess Engine Communication Protocol aka WinBoard, first released in July 2004 [1]. GES uses PVS with aspiration, a main transposition table and pawn hash table [2], verified null move pruning, and a rudimentary SEE. GES' extension policy was to add one ply if any of the conditions met, which were checks, pawns to 2nd/7th rank, mate threats, one replies, and recaptures, and later tried aggregated but fractional extensions without obvious progress [3].

See also

Forum Posts



External Links


  1. ^ new win32 winboard engine by David B. Weller, CCC, July 07, 2004
  2. ^ GES 111 by David B. Weller, CCC, August 19, 2004
  3. ^ Limiting extensions by David B. Weller, Winboard Forum, February 23, 2005

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