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New version chess engine: Tcheran 4.0

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Tcheran - UCI chess engine  Author: Jonathan Gilchrist
Rating Chess Engines Diary CEDR=2242

If you want to know what the ranking of the Tcheran engine is, we encourage you to visit the website with the monthly updated CEDR ranking - RATING page.

v.4.0:
Add late move reductions (100.80 +- 22.10 Elo)
Use SEE to order bad captures later in moves to try (6.69 +- 4.80 Elo)
Do not allow TT cutoffs in PV nodes (~0 Elo)
Misc
Avoid locking up the UCI thread if the 'Hash' option is set during a search
Add a new Github Action for building and publishing new releases

Elo   | 94.32 +- 8.83 (95%)
Conf  | 8.0+0.08s Threads=1 Hash=16MB
Games | N: 4102 W: 1938 L: 851 D: 1313
Penta | [90, 240, 655, 625, 441]
Elo   | 97.85 +- 16.25 (95%)
Conf  | 60.0+0.60s Threads=1 Hash=128MB
Games | N: 1024 W: 459 L: 178 D: 387
Penta | [11, 61, 167, 182, 91]


Tcheran 2.5 - results:
OpponentScore+-Games
Oxidation 0.7.25/8+28 Games
Schoenemann 0.2.03/8-28 Games
Rengar 2.0.01/8-68 Games
4ku 5.10/8-88 Games
Radiance 3.36/6+66 Games
CT800 1.461/6-46 Games
Knightx 4.110.5/6-56 Games
Cwtch 10.5/6-56 Games
Integral v40/6-66 Games
Amelia 0.122/2+22 Games
Nectar 0.1.72/2+22 Games
StoneChess 2024-09-132/2+22 Games
Heimdall 1.0 JA0/2-22 Games
Fidelio 17 MPV0/2-22 Games
Fidelio 170/2-22 Games
Patricia 3.10/2-22 Games
Rems 1508240/2-22 Games
Rems MPV Sep240/2-22 Games
Rems Sep240/2-22 Games
Roc 2024Aug240/2-22 Games
RubiChess 202408170/2-22 Games

 

Sample game from the Tcheran engine:


Partia mi si� podoba�a (ChessBase 16)
[Event "2024.09.14.NewEnginesTest"] [Site "Chess Engines Diary"] [Date "2024.09.17"] [Round "1.32"] [White "Tcheran 3.0"] [Black "StoneChess 2024-09-13"] [Result "1-0"] [ECO "B00"] [PlyCount "72"] [EventDate "2024.??.??"] {[%evp 0,72,19,31,42,25,25,33,56,29,66,76,56,24,36,21,11,4,-5,-3,16,4,10,-56,-5,-36,-18,-61,-61,-18,-15,-1,7,3,-6,-10,5,-13,9,3,10,13,10,49,46,43,67,31,56,45,49,47,71,43,90,58,61,73,114,133,184,186,153,187,235,243,654,652,873,1006,2044,2497,29979,29984,29985]} 1. e4 Nc6 2. d4 d5 3. e5 f6 4. Nf3 g5 5. h3 Bg7 6. Bb5 Nh6 7. O-O O-O 8. Re1 g4 9. hxg4 Bxg4 10. Bxc6 bxc6 11. e6 Qd6 12. Qe2 Nf5 13. c3 c5 14. Qc2 Bxf3 15. dxc5 Qc6 16. Qxf5 Be4 17. Qh3 Qxc5 18. Be3 Qb5 19. Nd2 Bg6 20. b3 Qd3 21. Nf3 c6 22. Rac1 Qa6 23. a4 Rfb8 24. Nd4 Rb7 25. b4 Rc8 26. a5 c5 27. bxc5 Rxc5 28. Nb3 Rcb5 29. Nc5 Qxa5 30. Nxb7 Rxb7 31. Red1 Rc7 32. Qf3 Be4 33. Qxe4 Rxc3 34. Qb1 Rxc1 35. Qb8+ Bf8 36. Rxc1 h5 1-0

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