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Created page with "'''Home * Engines * Pachera''' '''Pachera''',<br/> a chess program for the TRS-80 by Paul Ramsteijn which played the DOCCC 1983 in [https://en.w..."
'''[[Main Page|Home]] * [[Engines]] * Pachera'''
'''Pachera''',<br/>
a chess program for the [[TRS-80]] by [[Paul Ramsteijn]] which played the [[DOCCC 1983]] in [https://en.wikipedia.org/wiki/Leiden 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|assembly]] featured a 5 [[Ply|ply]] [[Alpha-Beta|alpha-beta]] search using the [[Killer Heuristic|killer heuristic]] <ref>[[Paul Ramsteijn]] ('''1984'''). ''Pachera''. in [[Roger Hünen]], [[Sicco Kooi]] (eds.) ('''1984'''). ''CSVN computerschaak toernooi Leiden 1983''. [http://www.schaakcomputers.nl/hein_veldhuis/database/files/08-1984,%20toernooibulletin%20van%20het%20Nederlands%20kampioenschap%20computerschaak%201983.pdf pdf] hosted by [[Hein Veldhuis]]</ref>.
=Selected Games=
<span id="Rebel"></span>[[DOCCC 1983]], round 4, [[Rebel]] - [[Pachera]] <ref>[[Roger Hünen]], [[Sicco Kooi]] (eds.) ('''1984'''). ''CSVN computerschaak toernooi Leiden 1983''. [http://www.schaakcomputers.nl/hein_veldhuis/database/files/08-1984,%20toernooibulletin%20van%20het%20Nederlands%20kampioenschap%20computerschaak%201983.pdf pdf] hosted by [[Hein Veldhuis]]</ref>
<pre>
[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
</pre>
=External Links=
* [https://en.wiktionary.org/wiki/pacher%C3%A0 pacherà - Wiktionary]
* [https://en.wikipedia.org/wiki/Antonio_Pachera Antonio Pachera from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
'''Pachera''',<br/>
a chess program for the [[TRS-80]] by [[Paul Ramsteijn]] which played the [[DOCCC 1983]] in [https://en.wikipedia.org/wiki/Leiden 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|assembly]] featured a 5 [[Ply|ply]] [[Alpha-Beta|alpha-beta]] search using the [[Killer Heuristic|killer heuristic]] <ref>[[Paul Ramsteijn]] ('''1984'''). ''Pachera''. in [[Roger Hünen]], [[Sicco Kooi]] (eds.) ('''1984'''). ''CSVN computerschaak toernooi Leiden 1983''. [http://www.schaakcomputers.nl/hein_veldhuis/database/files/08-1984,%20toernooibulletin%20van%20het%20Nederlands%20kampioenschap%20computerschaak%201983.pdf pdf] hosted by [[Hein Veldhuis]]</ref>.
=Selected Games=
<span id="Rebel"></span>[[DOCCC 1983]], round 4, [[Rebel]] - [[Pachera]] <ref>[[Roger Hünen]], [[Sicco Kooi]] (eds.) ('''1984'''). ''CSVN computerschaak toernooi Leiden 1983''. [http://www.schaakcomputers.nl/hein_veldhuis/database/files/08-1984,%20toernooibulletin%20van%20het%20Nederlands%20kampioenschap%20computerschaak%201983.pdf pdf] hosted by [[Hein Veldhuis]]</ref>
<pre>
[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
</pre>
=External Links=
* [https://en.wiktionary.org/wiki/pacher%C3%A0 pacherà - Wiktionary]
* [https://en.wikipedia.org/wiki/Antonio_Pachera Antonio Pachera from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
