Author: Peter McKenzie
Date: 20:34:02 11/18/99
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Thanks for an interesting post. I always like it when people put some thought into analysing actual chess positions and the play that results from them. Christophe, how about posting scores from Tiger? I have taken a bried look at these positions and quickly run them on LambChop for about 60sec on a PII 366mhz. Comments below: On November 18, 1999 at 17:33:57, Howard Exner wrote: >Here are a few examples of nice moves made by Tiger. Perhaps other programs make >these moves also. > >1. Of course in this example white can play anything and win but Tiger chooses >Qxf7. >Here Tiger readily enters an endgame with the move Qxf7. This is exactly how any >strong human would play. Most programs would most likely move the Queen. It is >for me at least, an indicator that something unique is going on with Tiger's >endgame eval. If it plays a move like Qxf7 >maybe it knows something about liquidating into completely won endgames. > >8/p2k1r2/1p2bQ2/3p4/8/1P4P1/1PP2R1P/6K1 w - - id Chess Tiger - Goldbar; bm f6f7; Yes, Qxf7 is the human move and a nice way to tidy up the game. My program kept switching between Qxf7, Qd4 and Qe5, in the end choosing Qe5 with a +10.9 score. Would be nice if it played Qxf7, but I'm not too worried when it sees such a big score. Food for though though. > >2. This game illustrates an excellent liquidation into a won endgame. Noteworthy >are the >two rook captures on f6. The move Bh3 is one of the nicest examples I've seen of >a program >swapping down into an easily won endgame. Here are the three moves and the >entire game. > >1rb2rk1/p1q2ppp/2nb1n2/2p1p3/4P3/1PNPN1P1/1BPQ2BP/R4RK1 w - - id Chess Tiger >12.0 K6 - Nimzo '99 P200MMX; bm f1f6; Initially Chop liked Nd5, but changed to Rxf6 after 6sec. Stayed with that move for the 60sec. Score +.98 pawns after 9ply search. >1r1q1rk1/p3bp1p/2n1bp1Q/2pNp3/4P3/1PNP2P1/1BP3BP/5RK1 w - - id Chess Tiger 12.0 >K6 - Nimzo '99 P200MMX; bm f1f6; Switching between Nxf6 and Rxf6 for a while. Locked onto Rxf6 after 7sec. Score +1.31 after 8ply. >2r2rk1/p2qbp1p/2n1bR1Q/1NpNp3/4P3/1P1P2P1/1BP3BP/6K1 w - - id Chess Tiger 12.0 >K6 - Nimzo '99 P200MMX; bm g2h3; I don't get Bh3 here, I'll have to take a longer look at it when I get home. I stay with Qg5+ from ply 2. I let it run for couple of min, the score was +3.74 after 9ply. PV starts with 1.Qg5+ Kh8 2.Bxe5+ Nxe5 3.Qxe5+ Kg8 4.Bh3 Does this transpose? Perhaps an improvement over Bh3 !? > >[Event "SSDF Game 40/2"] >[Site "Hans C."] >[Date "1999.11.07"] >[Round "22"] >[White "Chess Tiger 12.0 K6450"] >[Black "Nimzo '99 P200MMX"] >[Result "1-0"] >[WhiteElo "?"] >[BlackElo "?"] >[ECO "B24"] > >1. e4 c5 2. Nc3 Nc6 3. g3 Rb8 4. Bg2 b5 5. Nge2 b4 6. Nd5 e6 7. Ne3 Nf6 >8. d3 Be7 9. a3 bxa3 10. b3 O-O 11. O-O d6 12. Bxa3 e5 13. Bb2 Qc7 14. >f4 Bd7 15. fxe5 dxe5 16. Nc3 Bd6 17. Qd2 Bc8 18. Rxf6 gxf6 19. Ned5 Qd8 >20. Qh6 Be7 21. Rf1 Be6 22. Rxf6 Rc8 23. Nb5 Qd7 24. Bh3 Bxh3 25. Qg5+ >Kh8 26. Bxe5 Nxe5 27. Qxe5 Bxf6 28. Qxf6+ Kg8 29. Ne7+ Qxe7 30. Qxe7 f6 >31. Nxa7 Rf7 32. Nxc8 Rxe7 33. Nxe7+ Kf7 34. Nd5 Be6 35. Kf2 f5 36. Ke3 >h6 37. Nf4 Bd7 38. e5 Bc6 39. e6+ Ke7 40. c4 1-0 > >3. A nice move exploiting some of black's kingside weaknesses. > >1rb1r1k1/pp3p1p/2np2p1/q1p5/3bPB2/2NP1BP1/PPPQ1R1P/5RK1 w - - id Chess Tiger >12.0 K6 - Nimzo '99 P200MMX; bm f4d6; Chop locks on to Bxd6 straight away, and holds for 60sec. Score is only about +.26 though. > >4. Nxc5 leads to active piece play for white. The next few moves went 1 ... Nxf1 >2. Kxf1 Bc8 >and black's position is extremely cramped. Whether or not Nxc5 is the best move >is debatable(black's move Bc8 may not be the best defense)but it appears to >reveal an awareness of how the relative value of pieces change depending on >position. > >r2q1rk1/pp1b1pbp/2n1p1p1/2p1P3/P2pNP2/1P1PnNP1/2PQ2BP/R1B2RK1 w - - id Chess >Tiger 12.0 do - Shredder 2 P200MMX ; bm e4c5; Interesting. Chop wants to move its rook, switching between Re1 and Rf2 with a slight plus to white. I have a later version at home with better outpost scoring that might choose differently here. I doubt it will sac the change though. cheers, Peter
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