Author: J. Wesley Cleveland
Date: 16:33:02 05/01/04
Go up one level in this thread
On May 01, 2004 at 17:33:34, Vincent Lejeune wrote: >On May 01, 2004 at 17:05:27, J. Wesley Cleveland wrote: > >>On April 30, 2004 at 23:43:48, Robert Hyatt wrote: >> >>>On April 30, 2004 at 17:21:34, José Antônio Fabiano Mendes wrote: >>> >>>> [D]7k/6p1/2P3Qp/p3q2P/8/6P1/5K2/8 w >>>> Bogoljubow vs Stahlberg, Kemeri 1933 1. Qc2!! Qxh5 2. Qc4! >>> >>>This one takes crafty depth=16, not real quick. Almost 4 minutes to pick Qc2, >>>several more to see how good it really is... >>> >>[snip] >>While looking at this with crafty, I found the ugliest fail high I've seen with >>crafty. >> >>[D]2q4k/6p1/2P4p/p7/2Q5/6P1/6K1/8 w - - 0 4 >> >>hash table memory = 96M bytes. >>pawn hash table memory = 6M bytes. >> >>Crafty v19.10 >> >>White(1): sd 11 >>search depth set to 11. >>White(1): 2q4k/6p1/2P4p/p7/2Q5/6P1/6K1/8 w - - 0 4 >>White(1): analyze >>Analyze Mode: type "exit" to terminate. >>end-game phase >> clearing hash tables >> time surplus 0.00 time limit 22.50 (3:30) >> depth time score variation (1) >> 7-> 0.12 -0.14 1. Qb5 Qd8 2. Kf3 Qf8+ 3. Kg4 Qd6 4. >> Kf5 Qc7 >> 8 0.18 -0.15 1. Qb5 Qd8 2. Kf3 Qd6 3. Qc4 Qf6+ 4. >> Kg4 g6 5. Qd5 >> 8 0.46 -0.03 1. Kf3 Qd8 2. Qe4 Qd1+ 3. Kf4 Qd6+ >> 4. Kf3 Qc7 5. Qd5 <HT> >> 8-> 0.48 -0.03 1. Kf3 Qd8 2. Qe4 Qd1+ 3. Kf4 Qd6+ >> 4. Kf3 Qc7 5. Qd5 <HT> >> 9 0.95 -0.05 1. Kf3 Qf5+ 2. Ke3 Qe5+ 3. Kf3 Qf6+ >> 4. Ke4 Qe7+ 5. Kf3 Qa3+ 6. Kg2 Qf8 >> 7. c7 Qa8+ 8. Kf2 Qc8 >> 9 1.14 0.01 1. Qd5 a4 2. Qd7 Qa6 3. c7 Qe2+ 4. >> Kh3 Qh5+ 5. Kg2 Qe2+ >> 9-> 1.15 0.01 1. Qd5 a4 2. Qd7 Qa6 3. c7 Qe2+ 4. >> Kh3 Qh5+ 5. Kg2 Qe2+ >> 10 1.28 0.01 1. Qd5 a4 2. Qd7 Qa6 3. c7 Qe2+ 4. >> Kh3 Qh5+ 5. Kg2 Qe2+ >> 10 1.87 ++ 1. c7!! >> 10 17:13 1.45 1. c7 Qb7+ 2. Kh2 Qc8 3. Qc5 Kh7 4. >> g4 Kh8 5. Qxa5 <HT> >> 10-> 17:13 1.45 1. c7 Qb7+ 2. Kh2 Qc8 3. Qc5 Kh7 4. >> g4 Kh8 5. Qxa5 <HT> >> 11 17:14 ++ 1. c7!! >> 11 17:15 5.72 1. c7 Qb7+ 2. Kh2 Qc8 3. Qc5 Kh7 4. >> g4 a4 5. Qf5+ Qxf5 6. gxf5 a3 7. c8=Q >> a2 8. Qc3 >> 11-> 17:15 5.72 1. c7 Qb7+ 2. Kh2 Qc8 3. Qc5 Kh7 4. >> g4 a4 5. Qf5+ Qxf5 6. gxf5 a3 7. c8=Q >> a2 8. Qc3 >> time=17:15 cpu=88% mat=-1 n=1791242494 fh=99% nps=1.73M >> ext-> chk=381633369 cap=48652 pp=55417 1rep=27688883 mate=994 >> predicted=0 nodes=1791242494 evals=48417627 >> endgame tablebase-> probes=0 hits=0 >> hashing-> 65%(raw) 64%(depth) 99%(sat) 99%(pawn) >> hashing-> 0%(exact) 56%(lower) 1%(upper) > > >Shredder think it's a draw after 1.c7, some pertpetual missed to crafty I think. >Could you let crafty think a little longer ? I'm about sure you will see the >"ugliest fail low you've seen with crafty" ;) > Crafty fails low to a draw score quickly on the next ply. What makes this so ugly is that it takes 1.87 seconds to fail high, and 17:13 *minutes* to resolve the fail high.
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