Author: Bruce Moreland
Date: 14:38:06 04/17/99
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On April 15, 1999 at 18:18:50, Peter McKenzie wrote: >The Nolot test suite is a set of 11 very hard test positions, with the 11th >position being one of the easier ones. I tried it on lambchop last night, chop >managed to solve it in about 3000sec (50min) on my 133mhz Pentium with 32mb RAM. > The solution was found at ply 11. How do other programs go on this one? > >r1b3k1/p2p1nP1/2pqr1Rp/1p2p2P/2B1PnQ1/1P6/P1PP4/1K4R1 w - - >Solution: Rxh6 My most recent version on a quad Xeon 450 finds this in 54 seconds (ply 12). The is actually kind of unlucky. I ran this on one of my last good single-processor versions, on a P6/200, and it found this in 1:44, so you'd think that the multiprocessor version should find it in like 15 seconds, but it misses it and has to pick it up in the next ply. When it finds it it's like -1, then comes up to a draw score after a couple of minutes. I haven't run it long enough to find a win. The next Nolot for you to try is 10, and after that 2 or perhaps 1. I don't think that all of them are sound, but I think that DT II found a few others after several hours of search time. bruce r3qb1k/1b4p1/p2pr2p/3n4/Pnp1N1N1/6RP/1B3PP1/1B1QR1K1 w - - bm Nxh6; id "Position 1"; r4rk1/pp1n1p1p/1nqP2p1/2b1P1B1/4NQ2/1B3P2/PP2K2P/2R5 w - - bm Rxc5; id "Position 2"; r2qk2r/ppp1b1pp/2n1p3/3pP1n1/3P2b1/2PB1NN1/PP4PP/R1BQK2R w KQkq - bm Nxg5; id "Position 3"; r1b1kb1r/1p1n1ppp/p2ppn2/6BB/2qNP3/2N5/PPP2PPP/R2Q1RK1 w kq - bm Nxe6; id "Position 4"; r2qrb1k/1p1b2p1/p2ppn1p/8/3NP3/1BN5/PPP3QP/1K3RR1 w - - bm e5; id "Position 5"; rnbqk2r/1p3ppp/p7/1NpPp3/QPP1P1n1/P4N2/4KbPP/R1B2B1R b kq - bm axb5; id "Position 6"; 1r1bk2r/2R2ppp/p3p3/1b2P2q/4QP2/4N3/1B4PP/3R2K1 w k - bm Rxd8+; id "Position 7"; r3rbk1/ppq2ppp/2b1pB2/8/6Q1/1P1B3P/P1P2PP1/R2R2K1 w - - bm Bxh7+; id "Position 8"; r4r1k/4bppb/2n1p2p/p1n1P3/1p1p1BNP/3P1NP1/qP2QPB1/2RR2K1 w - - bm Ng5; id "Position 9"; r1b2rk1/1p1nbppp/pq1p4/3B4/P2NP3/2N1p3/1PP3PP/R2Q1R1K w - - bm Rxf7; id "Position 10"; r1b3k1/p2p1nP1/2pqr1Rp/1p2p2P/2B1PnQ1/1P6/P1PP4/1K4R1 w - - bm Rxh6; id "Position 11";
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