Author: Uri Blass
Date: 13:45:15 09/12/01
Go up one level in this thread
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. Uri
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