Author: Robert Hyatt
Date: 09:34:52 06/24/05
Go up one level in this thread
On June 24, 2005 at 02:09:17, Dann Corbit wrote: >On June 24, 2005 at 00:57:35, Christophe Drieu wrote: > >>Hello, i asked Junior 9 to analysed the third Hydra Adams >>final position. Junior seems to have problem after depth 18. Is it a known >>problem ? >> >>Regards >> >>[D]2r2rk1/1q2bpp1/3R1n1B/3ppN2/2p1P3/2P4P/1P3PP1/3QR1K1 b - - 0 1 >> >>Analysis by Junior 9: >> >>1...g7xh6 2.Cf5xh6+ Rg8-h7 3.Td6xd5 Rh7xh6 >> µ (-1.40) Profondeur: 3 00:00:00 >>1...g7xh6 2.Dd1-f3 Cf6xe4 3.Df3-g4+ Ce4-g5 4.Td6xh6 e5-e4 >> = (-0.11) Profondeur: 6 00:00:00 23kN >>1...g7xh6 2.Dd1-f3 Cf6xe4 3.Df3-g4+ Fe7-g5 4.Cf5xh6+ Rg8-h7 5.Dg4-f5+ Rh7-h8 >>6.Te1xe4 d5xe4 7.Df5xg5 Db7-b5 >> ± (1.16) Profondeur: 9 00:00:00 615kN >>1...Fe7xd6 2.Fh6xg7 Fd6-e7 3.Fg7xf8 Fe7xf8 4.e4xd5 Tc8-d8 5.d5-d6 >> = (0.22) Profondeur: 9 00:00:01 960kN >>1...Fe7xd6 2.Fh6xg7 Fd6-e7 3.Fg7xf6 Fe7xf6 4.Dd1-g4+ Rg8-h7 5.Dg4-h5+ Rh7-g8 >>6.Dh5-h6 Ff6-h8 7.Dh6-g5+ Rg8-h7 8.Dg5-h4+ Rh7-g8 9.Cf5-e7+ Rg8-g7 10.Dh4-g5+ >>Rg7-h7 >> ² (0.67) Profondeur: 12 00:00:08 7567kN >>1...Fe7xd6 2.Fh6xg7 Db7-b3 3.Dd1-d2 Cf6-h7 4.Fg7-f6 Tf8-e8 5.Cf5xd6 d5xe4 >>6.Cd6xc8 Te8xc8 7.Dd2-d7 Ch7xf6 8.Dd7xc8+ Rg8-g7 9.h3-h4 Db3xb2 10.Dc8xc4 >> +- (3.59) Profondeur: 15 00:03:47 202881kN >>1...g7-g6 2.Fh6xf8 Tc8xf8 3.Cf5xe7+ Db7xe7 4.Td6-a6 d5xe4 5.Dd1-a4 Tf8-d8 >>6.Da4xc4 Rg8-g7 7.b2-b4 De7-d7 >> +- (3.01) Profondeur: 15 00:06:27 346121kN >>1...g7-g6 2.Fh6xf8 Tc8xf8 3.Cf5xe7+ Db7xe7 4.Td6-a6 d5xe4 5.Dd1-a4 Tf8-c8 >>6.Te1-d1 Cf6-h5 7.Ta6-a8 De7-f8 8.Ta8xc8 Df8xc8 9.Da4-a7 >> +- (3.24) Profondeur: 16 00:08:47 463306kN >>1...g7-g6 2.Fh6xf8 Tc8xf8 3.Cf5xe7+ Db7xe7 4.Td6-a6 d5xe4 5.Dd1-a4 e4-e3 >>6.Te1xe3 Cf6-d5 7.Te3-g3 Cd5-f4 8.Da4xc4 De7-d7 9.Tg3-g5 Dd7-d1+ 10.Rg1-h2 >>Dd1-e1 >> +- (3.22) Profondeur: 17 00:11:38 595169kN >>1...g7-g6 2.Fh6xf8 Tc8xf8 3.Cf5xe7+ Db7xe7 4.Td6-a6 d5xe4 5.Dd1-a4 Rg8-g7 >>6.Da4xc4 Tf8-b8 7.b2-b4 Tb8-d8 8.Dc4-c6 Td8-d2 >> +- (3.27) Profondeur: 18 00:18:11 900957kN >>1...g7-g6 2.Fh6xf8 Tc8xf8 3.Cf5xe7+ Db7xe7 4.Td6-a6 d5xe4 5.Dd1-a4 Rg8-g7 >>6.Da4xc4 Tf8-d8 7.Dc4-c6 Td8-d2 >> +- (3.32) Profondeur: 19 00:36:45 1782751kN >>1...g7-g6 2.Fh6-g5 >> +- (3.62) Profondeur: 20 01:44:25 777269kN >>1...g7-g6 2.Fh6-g5 >> +- (3.92) Profondeur: 21 04:09:25 3631450kN >>1...g7-g6 2.Fh6-g5 >> +- (4.22) Profondeur: 22 09:23:07 1898555kN, tb=36 > >That's not a problem, it's just a hash table hit. It looks like multiple fail-lows to me, followed by finally dropping the lower bound to -MATE which makes the resulting tree impossibly large to search. Apparently it is happy that g6 is the best move without actually knowing the true score...
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