Author: Jim Monaghan
Date: 12:30:55 07/29/02
Hi everyone, I've been debugging the IQ suite lately. The following 10 positions need to be replaced. With the first nine lines, I've found alternate solutions. So the second solution just needs to be added. The 10th position had missed the "+" symbol in the solution. 2rr2k1/pb3p1p/1pq3p1/4R1N1/2n5/P4P2/BP2Q1PP/4R2K w - - bm Nxf7 Re7; id "IQ.932"; 2r1k1nr/3bbpp1/p2p2P1/4pP2/1pqNP3/2N1B3/PPP3Q1/1K1R2R1 w k - bm b3 Nd5; id "IQ.964"; 1kqr2r1/ppp5/2nb1p2/1Q1N2pb/P2P4/1RN1P3/3B1PP1/5R1K b - - bm Be2 Rh8; id "IQ.1011"; 5rk1/5pp1/3b4/1pp2qB1/4R2Q/1BPn4/1P3PPP/6K1 b - - bm Bf4 Ra8; id "IQ.1091"; 5b2/pr4pk/4P1Rp/1pppBPP1/8/1P2P3/P6K/8 w - - bm Rxh6+ gxh6; id "IQ.1123"; 2kr2r1/Qpq2p1p/1n2p3/2b2p2/8/2B2PP1/PPPN3P/R3K2R b - - bm Rxd2 Rxg3; id "IQ.1204"; r1b2k1r/1p4pp/p4B2/2bpN3/8/q2n4/P1P2PPP/1R1QR1K1 w - - bm Bxg7+ Qh5; id "IQ.1244"; r1n1nrk1/p4p1p/1q4pQ/2p1pN2/1pB1P1P1/5P2/PPP4P/1K1R3R w - - bm Rd6 Rhg1; id "IQ.1276"; r3r1k1/bpp1q1pp/p3bp2/2p4Q/4N3/1P2PP2/PB3P1P/R2R3K w - - bm Nxf6+ Rg1; id "IQ.1287"; r4rk1/4ppbp/1q2bnp1/n1p4P/4P1P1/2NBBP2/PP1Q4/1K1R2NR b - - bm Bxa2+; id "IQ.1290"; I've also been working a little more with the really tough positions. I thought I'd post a couple with the solutions to see if anyone out there can solve them. A good test position is always interesting. If there's interest I'll post others. On a Cel 1.3 Ghz/256 with 32MB hash after 5 minutes Shredder misses these: [D]4k3/pp2pp2/4n1p1/3RP1P1/2r1N3/P1P5/1P2q3/1K5Q w - - 4k3/pp2pp2/4n1p1/3RP1P1/2r1N3/P1P5/1P2q3/1K5Q w - - bm Nc5; id "IQ.1081"; Dzhindzhikhashvili-Tukmakov, Leningrad 1971 1. Nc5!! Rf4 (1... Rxc5 2. Qh8+ Nf8 3. Rxc5) 2. Qh8+ Nf8 3. Rd8+! Kxd8 4. Qf8+ Kc7 5. Qxe7+ Kc6 6. Qxb7+ (1-0) Engine: Shredder Paderborn by Stefan Meyer-Kahlen 15.01 3:47 +0.06 1.Nf6+ exf6 2.Qh8+ Nf8 3.Rd8+ Kxd8 4.Qxf8+ Kd7 5.Qd6+ Kc8 6.Qf8+ Kd7 7.Qd6+ Kc8 8.Qf8+ Kd7 9.Qd6+ (73.364.096) 322.6 best move: Ne4-f6 time: 5:03.667 min n/s: 321.569 CPU 99.2% nodes: 97.646.923 [D]4k3/pp2pp2/4n1p1/3RP1P1/2r1N3/P1P5/1P2q3/1K5Q w - - 8/5p1p/1n2p2P/1k1pPpP1/3K4/4N3/2P5/8 w - - bm Nxf5; id "IQ.1139"; Salo-Kupper, Amsterdam 1954 1. Nxf5!! exf5 2. e6! fxe6 3. g6! e5+ 4. Kd3 hxg6 5. h7 Kc5 6. h8=Q (1-0) Engine: Shredder Paderborn by Stefan Meyer-Kahlen 20.01 3:52 +2.06 1.Nxd5 Nxd5 2.c4+ Kc6 3.cxd5+ Kd7 4.d6 Kc6 5.Kd3 Kd7 6.Kd2 Ke8 7.Kc1 Kf8 (94.720.586) 407.4 best move: Ne3xd5 time: 5:03.927 min n/s: 404.297 CPU 97.7% nodes: 122.876.950 TB: 45.811 In this last one, Shredder stumbles into a draw due to the strong passed black f-pawn. Any programs "understand" these two positions in a reasonable time, say within 5 minutes? Cheers, Jim
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