LChess (L-Chess, Schaakmeester),
a chess program by Lex Loep, which played the WCCC 1995, the UPCCC 1994, as well as various Dutch Open Computer Chess Championships and Aegon Tournaments. LChess was market as Schaakmeester in the Netherlands, running under DOS with an own GUI, and was later ported to natively run under Windows NT . In the late 90s, LChess aka Schaakmeester for Windows evolved to ChessPartner  with GUI and an protocol adapter compliant to the Chess Engine Communication and UCI protocols, to support other WinBoard and UCI Engines , market by Lokasoft and as Chess Champ by Phoenix Games .
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 search, iterative deepening, PVS, null moves for pruning and thread detection, history tables, killer heuristics, transposition tables and 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 Pentium 90. Search speed is 30,000 - 50,000 nodes/second. Ger Neef wrote the user interface.
[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
- LChess' ICGA Tournaments
- History of ChessPartner
- Download Chess Programs by Ed Schröder
- Chess Champ for Windows (2003) - MobyGames