Author: Uri Blass
Date: 12:52:01 12/02/02
Go up one level in this thread
On December 02, 2002 at 15:16:53, Uri Blass wrote: >On December 02, 2002 at 14:23:03, Jeremiah Penery wrote: > >>On December 02, 2002 at 13:28:25, Steffen Basting wrote: >> >>>Hi! >>>How long do your engines need to find Nc6! with a huge white advantage (at least >>>+2)? >>>[D] kb2r1qr/pp3b2/1p2p3/1Pn1pp1n/R2N2pP/1PN1BPP1/4PQB1/R4K2 w - - 0 1 >>> >>>Regards, Steffen >> >>A modified Crafty 18.15/19.1 sort of hybrid, with many additions, AthlonXP >>1600MHz. I get only about 275k NPS here. >> >> 7 1.01 0.36 1. Nxf5 exf5 2. Bxc5 Nxg3+ 3. Qxg3 >> bxc5 4. Rxa7+ Bxa7 5. f4 >> 7-> 1.68 0.36 1. Nxf5 exf5 2. Bxc5 Nxg3+ 3. Qxg3 >> bxc5 4. Rxa7+ Bxa7 5. f4 >> 8 2.61 ++ 1. Nxf5!! >> 8 3.97 1.44 1. Nxf5 exf5 2. Bxc5 bxc5 3. Rxa7+ >> Bxa7 4. Qxc5 Nxg3+ 5. Kf2 Nh1+ 6. Bxh1 >> g3+ 7. Kg2 b6 >> 8 9.58 2.29 1. Nc6 bxc6 2. fxg4 e4 3. Rxa7+ Bxa7 >> 4. Bxc5 bxc5 5. Rxa7+ Kxa7 6. gxh5 > >So fast and not 1.Nc6 Nxa4 >Is it speculative score or agrresive threat or singular extensions that help in >this position? > >I get even after Nc6 at 11,12 plies the following lines >so movei probably needs at least depth 14 in the original position to find >1.Nc6 with +2 score. > >depth=11 +1.32 c5a4 c3a4 b7c6 b5c6 b8d6 a4b6 a8b8 b6c4 d6c7 e3a7 b8c8 c4b6 c7b6 >a7b6 c8b8 c6c7 b8c8 a1a8 c8d7 f3g4 e8a8 g2a8 >Nodes: 21542228 NPS: 136420 >Time: 00:02:37.91 >depth=12 +0.00 c5a4 c3a4 b7c6 b5c6 b8c7 a4b6 c7b6 e3b6 g4f3 a1a7 a8b8 a7b7 b8c8 >b7c7 c8b8 c7b7 >Nodes: 47866431 NPS: 135957 >Time: 00:05:52.07 >depth=12 +0.00 c5a4 c3a4 b7c6 b5c6 b8c7 a4b6 c7b6 e3b6 g4f3 a1a7 a8b8 a7b7 b8c8 >b7c7 c8b8 c7b7 >Nodes: 156307601 NPS: 131313 >Time: 00:19:50.34 > >Uri Even depth 13 after Nc6 is not enough for latest movei to see more than +2 for white so I guess that it needs at least depth 15 from the root position that may mean many hours. depth=13 -1.85 c5a4 c3a4 b7c6 b5c6 b8c7 a4b6 c7b6 e3b6 h5g3 f2g3 e8e7 c6c7 a8b7 f3g4 b7b6 g3e3 b6c7 a1a7 c7d8 e3b6 d8c8 a7a8 c8d7 a8g8 h8g8 Nodes: 314049824 NPS: 132147 Time: 00:39:36.51 Uri
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