Author: Dann Corbit
Date: 14:00:52 09/12/01
Go up one level in this thread
On September 12, 2001 at 16:45:15, Uri Blass wrote: >On September 12, 2001 at 16:08:11, Dann Corbit wrote: > >>On September 12, 2001 at 10:45:44, leonid wrote: >> >>>On September 12, 2001 at 10:34:41, leonid wrote: >>> >>>>[D]Q6r/1prpbqk1/1Q4q1/1Q1nn1p1/1Q1NN1p1/1R4q1/1BBQQRp1/K6b w - - >>>> >>>>Please indicate your result. >> >>According to chest, it's not a mate in 8. >> >>Crafty can't spot it, but I did not expect 17+ ply to be exhausted: >>EPD Kit revision date: 1996.04.21 >>unable to open book file [e:\crafty\release/books.bin]. >>hash table memory = 192M bytes. >>pawn hash table memory = 80M bytes. >>EGTB cache memory = 32M bytes. >>draw score set to 0.00 pawns. >>choose from book moves randomly (using weights.) >>choose from 5 best moves. >>book learning enabled >>result learning enabled >>position learning enabled >>threshold set to 9 pawns. >>5 piece tablebase files found >>19045kb of RAM used for TB indices and decompression tables >> >>Crafty v18.10 >> >>White(1): st 999 >>search time set to 999.00. >>White(1): epdpfga \t.epd t.out >>PFGA: EPD record: 1 >>middle-game phase >> clearing hash tables >> time surplus 0.00 time limit 16:39 (16:39) >> nss depth time score variation (1) >> 1 0.03 26.76 1. Rxf7+ Qxf7 >> 1-> 0.05 26.76 1. Rxf7+ Qxf7 >> 2 0.05 26.75 1. Rxf7+ Qxf7 2. Rxg3 Rxa8+ >> 2-> 0.19 26.75 1. Rxf7+ Qxf7 2. Rxg3 Rxa8+ >> 3 0.20 -- 1. Rxf7+ >> 3 0.23 24.14 1. Rxf7+ Qxf7 2. Qxh8+ Kxh8 3. Qh6+ >> Kg8 4. Rxg3 Bxb4 5. Qdxg5+ >> 3-> 0.63 24.14 1. Rxf7+ Qxf7 2. Qxh8+ Kxh8 3. Qh6+ >> Kg8 4. Rxg3 Bxb4 5. Qdxg5+ >> 4 0.79 24.14 1. Rxf7+ Qxf7 2. Qxh8+ Kxh8 3. Qh6+ >> Kg8 4. Rxg3 Bxb4 5. Qdxg5+ >> 4-> 2.13 24.14 1. Rxf7+ Qxf7 2. Qxh8+ Kxh8 3. Qh6+ >> Kg8 4. Rxg3 Bxb4 5. Qdxg5+ >> 5 2.17 ++ 1. Rxf7+!! >> 5 3.91 26.23 1. Rxf7+ Qxf7 2. Qxh8+ Kxh8 3. Rxg3 >> Bxb4 4. Qh6+ Kg8 5. Qdxg5+ Ng6 6. Qbxd5 >> 5-> 8.16 26.23 1. Rxf7+ Qxf7 2. Qxh8+ Kxh8 3. Rxg3 >> Bxb4 4. Qh6+ Kg8 5. Qdxg5+ Ng6 6. Qbxd5 >> 6 8.37 ++ 1. Rxf7+!! >> 6 19.60 26.77 1. Rxf7+ Qxf7 2. Qxh8+ Kxh8 3. Qh6+ >> Kg8 4. Nf6+ Nxf6 5. Qdxg5+ Ng6 6. Qhxg6+ >> Qxg6 7. Qxg6+ Kh8 8. Rxg3 Bxb4 9. Qxb4 >> 6-> 38.74 26.77 1. Rxf7+ Qxf7 2. Qxh8+ Kxh8 3. Qh6+ >> Kg8 4. Nf6+ Nxf6 5. Qdxg5+ Ng6 6. Qhxg6+ >> Qxg6 7. Qxg6+ Kh8 8. Rxg3 Bxb4 9. Qxb4 >> 7 40.59 ++ 1. Rxf7+!! >> 7 2:39 28.64 1. Rxf7+ Qxf7 2. Nf5+ Qxf5 3. Qxh8+ >> Kxh8 4. Qh6+ Qh7 5. Qxh7+ Kxh7 6. Nxg3+ >> Ng6 7. Qbd4 Bc5 >> 7-> 3:37 28.64 1. Rxf7+ Qxf7 2. Nf5+ Qxf5 3. Qxh8+ >> Kxh8 4. Qh6+ Qh7 5. Qxh7+ Kxh7 6. Nxg3+ >> Ng6 7. Qbd4 Bc5 >> 8 3:37 ++ 1. Rxf7+!! >> time=16:39 cpu=99% mat=22 n=589487968 fh=99% nps=590k >> ext-> chk=80125742 cap=1032919 pp=36146 1rep=5779692 mate=87 >> predicted=0 nodes=589487968 evals=3796048 >> endgame tablebase-> probes done=0 successful=0 >> >>So tell me, what's the solution? >> >>Pretty diagram, by the way. > >Crafty can solve it. > >I gave it the first move in the main line(Rxf7+) >and after every legal move it can see a forced mate > >1.Rxf7+ Qxf7 [1...Kxf7 2.Qxd5+ #4/5 2 ; >1...Kh6 2.Qxh8# #1/5 2 ; >1...Nxf7 2.Nf5+ #6/5 2 ] 2.Qxh8+ #10/8 1:47 > >1.Rxf7+ Qxf7 is the main line and it needs some time to >see mate in 10 after 1.Rxf7+ Qxf7 > >It has no problem to see shorter mate after all the other legal moves. Unforutnately, that's NOT the solution. It's Qxg6 according to leonid.
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