Author: Uri Blass
Date: 15:08:13 11/15/05
Go up one level in this thread
On November 15, 2005 at 17:36:37, Dieter Buerssner wrote: >On November 15, 2005 at 07:55:38, Bernhard Bauer wrote: > >>On November 14, 2005 at 11:25:28, Vincent Lejeune wrote: >> >>>[d]6k1/1p1r1pp1/3p3p/NP1Pp1n1/P3P2n/8/5K1P/4RB2 w - - 0 34 >>> >>>Nxb7! >>> >>>[Event "?"] >>>[Site "?"] >>>[Date "2005.11.06"] >>>[Round "3.8"] >>>[White "x"] >>>[Black "y"] >>>[Result "*"] >>>[SetUp "1"] >>>[FEN "6k1/1p1r1pp1/3p3p/NP1Pp1n1/P3P2n/8/5K1P/4RB2 w - - 0 34"] >>>[PlyCount "13"] >>> >>>34. Nxb7 Rxb7 35. a5 Rc7 36. b6 Rc2+ 37. Re2 Nxe4+ 38. Kg1 Nf3+ 39. Kh1 Rc1 40. >>>Rxe4 * >> >>Thank you for posting this position. >>For a human it is easy to see that the white a and b pawns are strong. So I >>changed the PastPawn parameter in Gambitfruit from 100 to 150. >>Nxb7 is found in 8 sec, however the engine switches to Nc6, which may be a good >>move too. Changing the the PastPawn parameter to a greater value will result in >>finding Nxb7 very early and give a good score too. > >I suspect, that Gambitfruit changed in this manner will not be able to win this >position (with not too much time against good defence). > >A couple of years ago, I made a similar change to Yace for one test position, >where an outside passed pawn would win the game. Yace had no problem to find the >correct move, and create that passed pawn. But it behaved very emberrassing. To >win, that passed pawn had to be given up later. But because of the high bonus, >Yace wanted to keep it ... > >>[D]8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1/ b > >I had tested this position rather often (the position was also discussed here >now and then). Some years ago, it seemed very difficult. I guess, with modern >hardware, many engines will solve it convincingly in short time. > >Regards, >Dieter I think that this position is one of the hardest positions in the ECMGCP Here is analysis by latest private Movei 16 13 65795 315616405 b6d8 h2h3 d8f6 g1f1 f6d4 g2g4 d2f2 f1e1 a7a5 b7a7 f2h2 a7a5 h2h3 e1e2 h7g6 a5a7 g6g5 16 14 75787 365947266 d2b2 16 43 79537 384327836 d2b2 16 220 282518 1292496939 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5 c3c2 b5h5 h7g6 h5d5 c2c1q b2d1 c4c3 d5d8 g6f5 d8d7 16 220 284237 1301029280 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5 c3c2 b5h5 h7g6 h5d5 c2c1q b2d1 c4c3 d5d8 g6f5 d8d7 17 234 318017 1441306426 d2b2 a4b2 c4c3 b7b6 c5c4 b6b4 a7a5 b4b5 c3c2 b5h5 h7g6 h5d5 c2c1q b2d1 c4c3 d5d6 g6f7 g2g4 c1f4 d6d7 f7f6 There are harder positions and here are the only 5 positions that latest movei did not solve(I did not give it fixed time but I gave at least 1417 seconds for every position and in some cases some hours as you can see based on the analysis and note that the positions are correct based on analysis). Note that latest movei is not compiled by dan Corbit and based on experience I expect 10-20% speed improvement from his compilation. Note that Nh5 is another winning move in position number 4 but Nxh7 is better In position number 3 it is less clear if Nxf2 is an alternative win inspite of the high score. 1) [D]2r1r1k1/pp1nbpp1/4pn1p/q3NN1P/P1pP1B2/2P5/1PQ2PP1/R3R1K1 w - - 0 1 bm Nxg7 15 72 51395 208365812 f5h6 g7h6 e5f7 a5h5 f7h6 g8h8 e1e3 e8g8 h6g8 c8g8 f4c7 f6d5 e3e6 g8g2 g1g2 h5g4 c7g3 d5f4 g2g1 f4h3 g1h1 g4e6 15 72 88225 384647084 f5h6 g7h6 e5f7 a5h5 f7h6 g8h8 e1e3 e8g8 h6g8 c8g8 f4c7 f6d5 e3e6 g8g2 g1g2 h5g4 c7g3 d5f4 g2g1 f4h3 g1h1 g4e6 16 61 117107 515011823 f5h6 g7h6 e5f7 a5h5 f7h6 g8g7 e1e3 e8h8 e3e6 e7d8 e6e3 d8c7 e3e7 g7f8 e7f7 f8e8 a1e1 e8d8 c2f5 h5f5 f4c7 d8c7 h6f5 16 61 311560 1404514827 f5h6 g7h6 e5f7 a5h5 f7h6 g8g7 e1e3 e8h8 e3e6 e7d8 e6e3 d8c7 e3e7 g7f8 e7f7 f8e8 a1e1 e8d8 c2f5 h5f5 f4c7 d8c7 h6f5 2) [D]1r3rk1/6p1/p1pb1qPp/3p4/4nPR1/2N4Q/PPP4P/2K1BR2 b - - 0 1 bm Rxb2 15 0 203065 819336855 b8b7 c1b1 e4c3 e1c3 d5d4 c3d2 d4d3 c2c3 f8b8 b2b3 b7b3 a2b3 b8b3 b1a2 b3a3 a2b1 a3b3 15 0 445545 1846126723 b8b7 c1b1 e4c3 e1c3 d5d4 c3d2 d4d3 c2c3 f8b8 b2b3 b7b3 a2b3 b8b3 b1a2 b3a3 a2b1 a3b3 16 0 918846 -519423971 b8b7 f4f5 f8b8 b2b3 d6b4 c1b2 b4a5 g4e4 d5e4 h3e3 f6e5 e1g3 a5c3 e3c3 e5c3 b2c3 b8f8 c3d4 b7b4 d4c5 b4b5 c5d4 3) [D]r1b2rk1/pp4bp/2p3p1/4q2n/NQPN1p1P/1P5n/P3PPB1/2BRRK2 b - - 0 1 bm f3 13 54 44654 174222149 g7f6 d4f3 e5e6 b4c5 e6g4 c1b2 f8e8 e2e4 f4e3 e1e3 c8e6 b2f6 h5f6 g2h3 g4h3 f1g1 13 55 56245 219831680 h3f2 13 84 58625 228875667 h3f2 13 178 71432 276971017 h3f2 f1f2 f4f3 e2f3 e5g3 f2g1 c8h3 e1e2 a8e8 d4e6 e8e6 e2f2 h3g2 f2g2 g3f3 13 178 86003 337230305 h3f2 f1f2 f4f3 e2f3 e5g3 f2g1 c8h3 e1e2 a8e8 d4e6 e8e6 e2f2 h3g2 f2g2 g3f3 14 148 89017 350884937 h3f2 14 200 121493 479079597 h3f2 f1f2 f4f3 g2f3 e5g3 f2e3 g3f4 e3d3 f4d4 d3c2 c8f5 e2e4 d4f2 c1d2 f2f3 e4f5 f3f5 c2c1 h5f4 d2f4 f5f4 c1b1 f4f5 b1c1 14 200 141700 567093775 h3f2 f1f2 f4f3 g2f3 e5g3 f2e3 g3f4 e3d3 f4d4 d3c2 c8f5 e2e4 d4f2 c1d2 f2f3 e4f5 f3f5 c2c1 h5f4 d2f4 f5f4 c1b1 f4f5 b1c1 4) [D]5r1k/ppp2qnp/1n1p1N1Q/3Ppb2/2P4P/7B/PP6/2KR2R1 w - - 0 1 bm Nxh7 15 114 59612 238350306 f6h5 g7h5 d1f1 h5f4 h3f5 f4e2 c1c2 f7e7 f5d3 e2f4 b2b3 f8f7 h6g5 e7f8 d3e4 f8e8 15 114 204059 790406482 f6h5 g7h5 d1f1 h5f4 h3f5 f4e2 c1c2 f7e7 f5d3 e2f4 b2b3 f8f7 h6g5 e7f8 d3e4 f8e8 5) [D]2rq1rk1/pp1bnpbp/4p1p1/3pP1N1/3P2Q1/2PB4/P4PPP/R1B1R1K1 w - - 0 1 bm Nxh7 17 60 148132 578611666 c1d2 h7h6 g5f3 e7f5 g4h3 h6h5 a1b1 c8c7 d3f5 e6f5 d2f4 c7c3 b1b7 c3a3 f4g5 d8c8 b7b2 17 60 202439 796913103 c1d2 h7h6 g5f3 e7f5 g4h3 h6h5 a1b1 c8c7 d3f5 e6f5 d2f4 c7c3 b1b7 c3a3 f4g5 d8c8 b7b2 18 52 326940 1242033202 c1d2 h7h6 g5f3 e7f5 g4h3 h6h5 a1b1 b7b6 g2g4 h5g4 h3g4 d8e7 b1b4 g7h6 f3g5 f8e8 g1h1 h6g5 d2g5 18 52 480834 1881892578 c1d2 h7h6 g5f3 e7f5 g4h3 h6h5 a1b1 b7b6 g2g4 h5g4 h3g4 d8e7 b1b4 g7h6 f3g5 f8e8 g1h1 h6g5 d2g5
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