Author: Jeremiah Penery
Date: 22:41:38 11/18/99
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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. All of mine are run on a modified Crafty 16.19/17.1 hybrid, PII-300. >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; Plays Qxf7 from ply 2 on, fails high on almost every iteration thereafter. Score is +28 at ply 12, 5:46. >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; Can't decide what to play here. At ply 12 it finally chooses Rxf6 with +0.55. Changes to +0.43 at ply 13, and gives: 1. Rxf6 gxf6 2. Ned5 Qd8 3. Qh6 Be7 4. Nxe7+ Nxe7 5. Qxf6 Qd4+ 6. Kh1 Ng6 7. Nd1 Qd7 8. Bxe5 Nxe5 9. Qxe5. I didn't let it search further, but it may change its mind again at this ply. >1r1q1rk1/p3bp1p/2n1bp1Q/2pNp3/4P3/1PNP2P1/1BP3BP/5RK1 w - - id Chess Tiger 12.0 >K6 - Nimzo '99 P200MMX; bm f1f6; Switches between Rxf6 and Nxf6, then Nxe7. At ply 12, score is +0.02 for Rxf6. This is the line it gives: 1. Rxf6 Kh8 2. Nxe7 Qxe7 3. Nd5 Qd8 4. Rf2 Rg8 5. Nf4 Bd7 6. Qd6 f6. Later at this ply, it gives: 1. Nxe7+ Nxe7 2. Na4 Ng6 3. Nxc5 Qe7 4. Nxe6 fxe6 5. Qd2 Rfc8 6. Qf2 with +0.18. >2r2rk1/p2qbp1p/2n1bR1Q/1NpNp3/4P3/1P1P2P1/1BP3BP/6K1 w - - id Chess Tiger 12.0 >K6 - Nimzo '99 P200MMX; bm g2h3; Locks on to Bh3 at ply 12, score is +4.48. Line: 1. Bh3 Bxh3 2. Qg5+ Kh8 3. Bxe5 Nxe5 4. Qxe5 Bxf6 5. Qxf6+ Kg8 6. Ne7+ Qxe7 7. Qxe7 a6 8. Na7 Rce8 9. Qxc5 Kh8 >[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; Pretty much likes Bxd6 from ply 2 on, but isn't too happy about the score. At ply 12 it has +0.15 with 1. Bxd6 Ra8 2. Bg2 Be6 3. Bf4 Bxf2+ 4. Qxf2 Nd4 5. Be5 Qb4 6. Nd1 Qa4 7. Nc3 >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; Picks Re1 at ply 12, score is -0.55. 1. Re1 Nxg2 2. Qxg2 b6 3. Nfd2 a5 4. Nc4 Nb4 5. Ned6 Bc6 6. Qf2 Qc7. It's not too happy with Nxc5. Score is near -1 at ply 14.
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