25,161
edits
Changes
Created page with " '''Home * Engines * LChess''' '''LChess''' (L-Chess, Schaakmeester), <br/> a chess program by Lex Loep, which played the WCCC 1995, the UPCCC 199..."
'''[[Main Page|Home]] * [[Engines]] * LChess'''
'''LChess''' (L-Chess, Schaakmeester), <br/>
a chess program by [[Lex Loep]], which played the [[WCCC 1995]], the [[UPCCC 1994]], as well as various [[Dutch Open Computer Chess Championship|Dutch Open Computer Chess Championships]] and [[Aegon Tournaments]]. LChess was market as ''Schaakmeester'' in the [https://en.wikipedia.org/wiki/Netherlands Netherlands], running under [[MS-DOS|DOS]] with an own [[GUI]], and was later ported to natively run under [[Windows|Windows NT]] <ref>[http://www.lokasoft.nl/history.htm History of ChessPartner]</ref>. In the late 90s, LChess aka ''Schaakmeester'' for Windows evolved to [[ChessPartner]] <ref>[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/ccff9c16b2022c6a ChessPartner 4.0 available] by [[Lex Loep]], [[Computer Chess Forums|rgcc]], October 9, 1998</ref> with GUI and an protocol adapter compliant to the [[Chess Engine Communication Protocol|Chess Engine Communication]] and [[UCI]] protocols, to support other [[WinBoard Engines|WinBoard]] and [[UCI Engines]] <ref>[http://www.lokasoft.nl/chesspartner.aspx ChessPartner 6.0]</ref>, market by [[Lokasoft]] and as ''Chess Champ'' by [https://en.wikipedia.org/wiki/Tuna_Technologies Phoenix Games] <ref>[http://www.mobygames.com/game/windows/chess-champ Chess Champ for Windows (2003) - MobyGames]</ref>.
=Description=
given in 1995 from the [[ICGA]] page <ref>[https://www.game-ai-forum.org/icga-tournaments/program.php?id=193 LChess' ICGA Tournaments]</ref>:
The first version of LChess was written in 1987. In 1988 it participated for the first time in the Dutch Computer Chess Championship, ending 13th in a field of 16; the best result was in 1990 when it ended on a shared 3rd place. Lex Loep has steadily worked on the chess engine and the version which is playing in the WCCC has been ported to Windows NT. Techniques used by the chess engine include [[Alpha-Beta|alpha-beta]] search, [[Iterative Deepening|iterative deepening]], [[Principal Variation Search|PVS]], [[Null Move|null moves]] for [[Null Move Pruning|pruning]] and [[Null Move Pruning#ThreatDetection|thread detection]], [[History Heuristic|history tables]], [[Killer Heuristic|killer heuristics]], [[Transposition Table|transposition tables]] and [[Refutation Table|refutation tables]]. Tactically the program plays very well, and is particularly good in finding mate threads. Positionally there is still a lot of work to do. On the Reinfeld test set it scores more than 80% with 1 minute CPU time on a [[x86|Pentium 90]]. Search speed is 30,000 - 50,000 [[Nodes per second|nodes/second]]. [[Ger Neef]] wrote the user interface.
=Selected Games=
[[DOCCC 1997]], round 2, [[LChess]] - [[Dappet]]
<pre>
[Event "DOCCC 1997"]
[Site "Alphen a/d Rijn NED"]
[Date "1997.11.22"]
[Round "02"]
[White "LChess 4.0"]
[Black "Dappet"]
[Result "1-0"]
1.d3 g6 2.Nf3 Nf6 3.c3 Bg7 4.e4 d5 5.e5 Nfd7 6.d4 f6 7.exf6 exf6
8.Qe2+ Kf7 9.Qd1 Ke8 10.Bd3 Kf7 11.O-O c5 12.dxc5 Nxc5 13.Bc2 Be6
14.Nd4 Qd6 15.b4 Ncd7 16.Na3 Na6 17.Nab5 Qb6 18.Bb3 Rae8 19.Nxe6
Qxb5 20.a4 Qc6 21.Nd8+ Rxd8 22.Bxd5+ 1-0
</pre>
=See also=
* [[ChessPartner]]
=Forum Posts=
* [http://www.talkchess.com/forum/viewtopic.php?t=22448 How strong is LCHESS 5.3.0.2] by [[Charles Roberson]], [[CCC]], July 19, 2008
=External Links=
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=193 LChess' ICGA Tournaments]
* [http://www.lokasoft.nl/history.htm History of ChessPartner]
* [http://www.top-5000.nl/cp.htm Download Chess Programs] by [[Ed Schroder|Ed Schröder]]
* [http://www.mobygames.com/game/windows/chess-champ Chess Champ for Windows (2003) - MobyGames]
: [http://www.mobygames.com/game/windows/chess-champ/screenshots/gameShotId,485483/ Chess Champ Screenshots for Windows - MobyGames]
=References=
<references />
'''[[Engines|Up one level]]'''
