Author: Uri Blass
Date: 22:51:48 07/29/02
Go up one level in this thread
On July 29, 2002 at 15:30:55, Jim Monaghan wrote: >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? Movei understand nothing and knows nothing about passed pawns but can see Nxf5 in less than 5 minutes on p850(32 mbytes hash) (it does not mean that it is not going to change it's mind if it gets depth 20). Movei use no hash to prune the tree so it has problems to get as deep as shredder. 14 152 27040 68171663 e3f5 b5c6 f5d6 b6d7 d6f7 d7f8 c2c3 f8g6 f7d8 c6d7 d8b7 d7c6 b7d6 g6f4 c3c4 f4e2 d4d3 14 152 27045 68178700 e3f5 b5c6 f5d6 b6d7 d6f7 d7f8 c2c3 f8g6 f7d8 c6d7 d8b7 d7c6 b7d6 g6f4 c3c4 f4e2 d4d3 15 150 36235 88288386 e3f5 b6d7 f5d6 b5c6 d6f7 d7f8 c2c3 f8g6 c3c4 d5c4 d4c4 g6h4 f7d6 h4f3 d6f7 c6b6 15 150 40348 99039787 e3f5 b6d7 f5d6 b5c6 d6f7 d7f8 c2c3 f8g6 c3c4 d5c4 d4c4 g6h4 f7d6 h4f3 d6f7 c6b6 Uri
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