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Pachera,
a chess program for the TRS-80 by Paul Ramsteijn which played the DOCCC 1983 in Leiden, and became 6th of 14 with respectable 4½ out of 8. Motivated by the programmers of Dappet while visiting the DOCCC 1981, Paul Ramsteijn studied some literature on the topic, and began to write his own chess program. Version 1.0 finished in January 1982 was written in Pascal, version 2.0 in Z80 assembly featured a 5 ply alpha-beta search using the killer heuristic [1].

Selected Games

DOCCC 1983, round 4, Rebel - Pachera [2]
[Event "DOCCC 1983"]
[Site "Leiden NED"]
[Date "1983.08.21"]
[Round "4"]
[White "Rebel"]
[Black "Pachera"]
[Result "1/2-1/2"]
 
1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bb4+ 7.Bd2 Nxd2 8.Nbxd2 Nc6 
9.c3 Bd6 10.O-O Qf6 11.Qb3 Ne7 12.Rae1 Bf4 13.Qxd5 Bxd2 14.Nxd2 Qf4 15.Qb5+ c6 
16.Qb4 Qc7 17.Nc4 a5 18.Qd6 Qd8 19.Qe5 Kf8 20.Nb6 Ra7 21.Qxe7+ Qxe7 22.Nxc8 Qc7 
23.Nxa7 b6 24.Nb5 cxb5 25.Bxb5 g6 26.Re8+ Kg7 27.Rfe1 Rxe8 28.Rxe8 Qf4 29.Re3 Qf5 
30.Bd3 Qd5 31.Bb1 a4 32.g3 Qb5 33.b3 axb3 34.axb3 Qxb3 35.Be4 g5 36.d5 g4 37.Kg2 
f5 38.Bxf5 Qxd5+ 39.Be4 Qc5 40.Bd3 b5 41.Be2 h5 42.Rd3 Qe5 43.Rd2 Qe4+ 44.f3 Qc6 
45.Rb2 Kf7 46.Rb4 Kg8 47.Rb3 Qb6 48.Rb2 Kf7 49.Rb4 Kg8 50.Bxb5 gxf3+ 51.Kxf3 Qf6+ 
52.Ke4 Qxc3 53.Bc4+ Kf8 54.Rb8+ Ke7 55.Be2 Qc6+ 56.Ke3 Qc5+ 1/2-1/2

External Links


References

  1. ^ Paul Ramsteijn (1984). Pachera. in Roger Hünen, Sicco Kooi (eds.) (1984). CSVN computerschaak toernooi Leiden 1983. pdf hosted by Hein Veldhuis
  2. ^ Roger Hünen, Sicco Kooi (eds.) (1984). CSVN computerschaak toernooi Leiden 1983. pdf hosted by Hein Veldhuis

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