a chess program written by Gerardo Castaño Recio. Zeus played various Spanish Computer Chess Championships and won the SCCC 1994 in Valencia. Zeus further participated at the WCCC 1995 in Shatin, Hong Kong, the WMCCC 1995 in Paderborn and the WMCCC 1996 in Jakarta.
Gerardo Castano works as a medical doctor and writes computer chess programs as a hobby. Zeus 1.0 was written in Basic and finished fifth out of seven in the First Spanish Computer Chess Championship in 1993. The program was rewritten in C in 1994 and uses the standard techniques of alpha-beta search, selective extensions, minimal PVS, transposition tables, killer heuristic, history heuristic, null-move pruning and quiescence search. Capturing moves, checks, promotions, mate threats are all considered in the search. Zeus 2.0 used 256KB hash tables and searched 3000 nodes per second. It won the Second Spanish Computer Chess Championship in 1994 with a perfect score of 7/7. Zeus 3.0 uses massive hash tables (32MB), and contains extensive chess knowledge (pawn structure, strong squares, bad bishop etc). The opening book contains about 300,000 positions and recognizes move and color transpositions. The endgame database is being developed and the evaluation function, although large, has thus far produced good results...
[Event "WCCC 1995"] [Site "Shatin, Hong Kong -China"] [Date "1995.05.28"] [Round "4"] [White "Zeus 3.0"] [Black "Phoenix 1989"] [Result "1-0"] 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nc3 e6 5.g4 Bg6 6.Nge2 c5 7.Be3 Nc6 8.dxc5 Nxe5 9.Nf4 d4 10.Nxg6 hxg6 11.Bb5+ Ke7 12.Bf4 f6 13.Bxe5 fxe5 14.Qf3 Rb8 15.O-O-O a6 16.Bc4 Qc7 17.Ne4 Nf6 18.Ng5 Qxc5 19.Bxe6 Qd6 20.Qd3 Rh6 21.Rde1 Nh7 22.Nf3 Rh3 23.Bc4 Nf6 24.Rxe5+ Kd8 25.Rhe1 Kc7 26.Be6 g5 27.Bf5 b5 28.Kb1 Ra8 29.a3 Rb8 30.Re6 Qd5 31.Qd2 Bd6 32.Nxd4 Bc5 33.Rxf6 gxf6 34.Nxb5+ Kc6 35.Be4 Qxe4 36.Rxe4 Rxb5 37.Re6+ Kc7 38.Qd5 1-0