Author: Uri Blass
Date: 07:48:45 07/20/04
Go up one level in this thread
On July 20, 2004 at 10:33:04, Uri Blass wrote: >On July 20, 2004 at 10:13:37, Uri Blass wrote: > >>On July 19, 2004 at 07:31:35, Omid David Tabibi wrote: >> >>>It is well known that the ECM test suite has a large number of erros and >>>inaccuracies. GCP has compiled a test suite which doesn't include the more >>>problematic positions. But I wanted to take a look at all 879 positions of ECM >>>and correct them. >>> >>>On my AMD64 3200+, I ran Junior 8, Deep Fritz 8, Shredder 8, and Falcon for 10 >>>seconds per position. Results were: >>> >>>Shredder 8: 696 >>>Deep Fritz 8: 696 >>>Falcon: 680 >>>Junior 8: 637 >>> >>>Next, I analyzing all the positions were all the engines failed to solve (about >>>100 positions). The resived test suite can be downloaded from: >>> >>>http://www.cs.biu.ac.il/~davoudo/pubs/ecmx.epd >>> >>>Each of these 100 positions was of one of the following types: >>> >>>1. Correct move, but requires very deep search. Naturally I didn't change >>>anything. >>> >>>2. Correct move, but there are additional winning moves. I added the other >>>winning moves. Sometimes the alternative winning moves were much better, but I >>>didn't remove the original move, as long as it was not a blunder. >>> >>>3. Blunder or bad moves. Some suggested best moves are simply blunders. It seems >>>that these moves have been introduced as a result of typos (e.g. Bd4 instead of >>>Bc4). In some other cases the best move is wrong because the defending side has >>>a nice (and usually deep) defense, apparently not taken into consideration when >>>compiling the test suite. >>> >>>4. I didn't find any win for the suggested best move, or am not sure whether it >>>is indeed the best move. There are 26 such positions which appear below. It >>>would be nice if you could analyze them longer and see whether the suggested >>>best move is indeed the best, or alternatives should be added: >>> >>>r3r1k1/pp3ppp/1qp5/2bbNQ2/5B2/2P5/PP3PPP/3RR1K1 w - - bm Rxd5; id "ECM.349"; >>>1k2rb1r/pbp1q1pp/2pp4/2PnpP2/Q7/1P3NP1/PB5P/2KR1B1R w - - bm Rxd5; id "ECM.371"; >>>2bq1b2/1p3k2/1r1p1p1p/pNpP1PpP/P1P3P1/6B1/1P5Q/2K1R3 w - - bm Re6; id "ECM.396"; >>>rq1r2k1/3nbp1p/p2p2p1/1p1Pp1P1/3B1P2/3B3Q/PPP4P/2KR2R1 w - - bm f5; id >>>"ECM.497"; >>>r3k1r1/pb1qpp1p/1pnp1n1B/2p2R2/3PP3/2P3PN/P1P3BP/R2Q3K b q - bm Nxe4; id >>>"ECM.561"; >>>8/p5k1/2p2p2/4p1p1/1p2P3/1P4PP/1PP5/5K2 b - - bm g4; id "ECM.601"; >> >>Movei found the move and based on another post it may be one of the moves that >>leads to draw. >> >>>8/8/4b1p1/2Bp3p/5P1P/1pK1Pk2/8/8 b - - bm g5; id "ECM.605"; >>>4r2k/3n1Qpp/1pRP1p2/p4P2/1p1P2P1/6rP/P3q1B1/6RK w - - bm Qe6; id "ECM.624"; >>>r1b2rk1/2q1bppp/p1n1p3/1p1np1P1/5P2/1NNBBQ2/PPP4P/R4RK1 w - - bm Bxh7+; id >>>"ECM.665"; >>>2rqr1k1/1p1bbppp/p3p3/n7/3P2Q1/2PB1N2/P4PPP/R1B1R1K1 w - - bm Bxh7+; id >>>"ECM.673"; >>>r1b2r1k/ppppq1pp/2n1n3/6N1/2B2P2/4B3/PPP3PP/R2Q1RK1 w - - bm Nxh7; id "ECM.674"; >>>rn1q1rk1/pb1p1ppp/4p3/2pnP3/1bp5/2N2N2/PP3PPP/RBBQK2R w KQ - bm Bxh7+; id >>>"ECM.675"; >>>r1b2rk1/1pq2ppp/p1p1p3/2n1P3/2N2P2/3B4/PPP3PP/R2Q1RK1 w - - bm Bxh7+; id >>>"ECM.677"; >>>2k3r1/ppq2p1p/n1Pb1p2/8/6r1/4BN1b/PPQ2PPP/R3RBK1 b - - bm Bxh2+; id "ECM.698"; >>>r5k1/pn1q1rpp/2pp4/5R1N/bP6/4BQ2/P4PPP/2R3K1 w - - bm Nxg7; id "ECM.714"; >>>4kbr1/pp1bpp1p/3p1p2/3N4/1PBQP3/q7/P1r2PPP/R4RK1 b - - bm Rxg2+; id "ECM.725"; >>>r3r1k1/pbq1ppbp/1pp2np1/4N3/3P4/2P5/PPB1QPPP/R1B1R1K1 w - - bm Nxf7; id >>>"ECM.762"; >>>2rqr1k1/pb2bp1p/1pn1pnpB/4N3/3P4/P1N3R1/1P3PPP/RB1Q2K1 w - - bm Rxg6+; id >>>"ECM.810"; >>>1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - - bm Rxf6; id "ECM.825"; >>>rr4k1/5p1p/n2p1npQ/q1pP4/6P1/2N2P1N/PP1R3P/2K4R b - - bm Rxb2; id "ECM.853"; >>>5rk1/5rp1/p2qb3/R2Np2Q/3bP2B/7P/P5PK/1R6 b - - bm Rf1; id "ECM.856"; >>>3r1rk1/p3q1pp/2Rb4/3P4/8/1P2Qp2/PB3PPP/3R2K1 b - - bm Bxh2+; id "ECM.858"; >>>8/2q1np1k/6p1/1PPn3p/8/P2Q3P/6P1/2R4K b - - bm Nf5; id "ECM.864"; >>>7R/1p1r4/2b2p2/2Pp1qk1/3P1bp1/3N4/2Q2PB1/6K1 w - - bm Rg8+; id "ECM.866"; >> >>It is one of the problems that Movei needs slightly more than 10 seconds to find >>the suggested move. >>Is there a better move than Rg8? >> >>Movei's score at depth 14 is 0.04 pawns against white. >>I will give it to continue to search because it may change it's mind. >> >>Uri > >The score of Movei was 0.00 at depth 15 and 16 >Now I ask Fritz to see if it suggests a better move. > >Fritz8 suggests Qe2 0.22/14 0.25/15 and I will give it more time. > >Uri I will continue to analyze with Fritz. The evaluation is going down at depth 16 to 0.16(it never was smaller than it) amd the score is not changed at depth 17. If it continues to go down behind 0 then it may understand that it needs Rg8+ in order to force a draw. New game [D]7R/1p1r4/2b2p2/2Pp1qk1/3P1bp1/3N4/2Q2PB1/6K1 w - - 0 1 Analysis by Fritz 8: 1.Qe2 Rg7 2.Nxf4 Qxf4 3.Qd3 Qc1+ 4.Bf1 Qf4 5.Be2 ± (0.94) Depth: 7/22 00:00:00 139kN 1.Qe2 Rg7 2.Nxf4 Qxf4 3.Qd3 Qc1+ 4.Bf1 Qf4 5.Be2 Bd7 ± (0.94) Depth: 8/24 00:00:00 296kN 1.Qe2 Rg7 2.Nxf4 Qxf4 3.Qd3 f5 4.Qc3 Kf6 5.Rf8+ Rf7 6.Rh8 ± (0.75) Depth: 9/26 00:00:00 738kN 1.Qe2 Rg7 2.Nxf4 Qxf4 3.Qd3 f5 4.Qc3 Kf6 5.Rh4 Kf7 6.Qb2 ² (0.56) Depth: 10/27 00:00:01 2338kN 1.Qe2 Rg7 2.Qd1 Kg6 3.Qb3 Bd2 4.Qc2 Bg5 5.Qb1 g3 6.Qd1 gxf2+ ² (0.38) Depth: 11/33 00:00:05 7758kN 1.Qe2 Rg7 2.Qd1 Kg6 3.Qb3 Bd2 4.Qc2 Bg5 5.Qb1 g3 6.Qd1 gxf2+ 7.Nxf2 Rh7 = (0.22) Depth: 12/33 00:00:16 22694kN 1.Qc3! = (0.25) Depth: 12/33 00:00:18 24428kN 1.Qc3 Rg7 2.Qb3 Bc7 3.Nb4 Re7 4.Qd1 Kg6 5.Rg8+ Rg7 6.Rxg7+ Kxg7 7.Qb3 Qh7 8.Nxd5 Qh2+ ² (0.28) Depth: 12/33 00:00:20 28048kN 1.Qd1! ² (0.31) Depth: 12/35 00:00:28 37678kN 1.Qd1 Kg6 2.Rh4 Kg5 3.Rh1 Kg6 4.Nb4 Bg5 5.Bf1 Kg7 6.Nxc6 bxc6 7.Be2 Re7 8.Bxg4 = (0.16) Depth: 13/38 00:00:53 70986kN 1.Qe2! = (0.19) Depth: 13/38 00:00:59 79339kN 1.Qe2 Rg7 2.Qd1 Kg6 3.Qc2 Bg5 4.Qb1 Bd2 5.Rh4 Kg5 6.Rh1 Rh7 = (0.22) Depth: 13/38 00:01:04 85388kN 1.Qe2 Rg7 2.Qd1 Kg6 3.Qc2 Bg5 4.Qb1 Bd2 = (0.22) Depth: 14/36 00:01:47 144812kN 1.Qe2 Rg7 2.Qd1 Kg6 3.Qb1 Bc7 4.Ne5+ fxe5 5.Rh6+ Kxh6 6.Qxf5 e4 7.Qf6+ Kh7 8.Bf1 = (0.25) Depth: 15/41 00:03:30 287733kN 1.Qe2 Rg7 2.Qd1 Ba4 3.Qb1 Rh7 4.Rg8+ Kh6 5.Bxd5 Bc6 6.Bxc6 bxc6 7.Qb3 Bd2 8.Re8 Qf3 = (0.16) Depth: 16/42 00:08:05 666983kN 1.Qe2 Rg7 2.Qd1 Ba4 3.Qb1 Bc6 4.Qb3 Bc7 = (0.16) Depth: 17/47 00:19:11 1596981kN (, MyTown 20.07.2004)
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