Author: Dusan Dobes
Date: 23:45:05 01/23/01
Go up one level in this thread
On January 23, 2001 at 11:53:04, Robert Hyatt wrote: >On January 23, 2001 at 10:36:04, Uri Blass wrote: > >>On January 23, 2001 at 10:12:24, Robert Hyatt wrote: >> >>>On January 23, 2001 at 03:06:53, Dusan Dobes wrote: >>> >>>>On January 22, 2001 at 15:57:52, Dann Corbit wrote: >>>> >>>>>>I am interested if "your" engine could resist to play 46.Qe6+ in a blitz game. >>>>>> >>>>>>[D]6k1/2pq4/5Q2/p2PPP2/1p1P4/8/P6P/7K w >>>>>> >>>>>>Best wishes, >>>>>>Steffen. >>>>>> >>>>>>[Event "ICS rated blitz match"] >>>>> >>>>>Phalanx has a time of it: >>>>> >>>>>[ white, 1 ] >>>>>6k1/2pq4/5Q2/p2PPP2/1p1P4/8/P6P/7K w >>>>> >>>>>6k1/2pq4/5Q2/p2PPP2/1p1P4/8/P6P/7K w >>>>> -> increment adds 1440 s to soft time limit >>>>> -> soft time limit 3154.28 s >>>>> -> hard time limit 41599.9 s >>>>> 6 654 112 213089 Qf6-e6 Qd7-f7 Pf5-f6 Pa5-a4 Qe6-c8 Kg8-h7 >>>>> Pe5-e6 Qf7xf6 Qc8xc7 Kh7-g6 >>>>> 6 -> 0:01.60 305919 0 turns >>>>> 7 654 583 1226489 Qf6-e6 ?? >>>>> 7 352 742 1585651 Qf6-e6 Qd7xe6 Pf5xe6 Pa5-a4 Pd5-d6 Pc7xd6 >>>>> Pe5xd6 Kg8-f8 Pd6-d7 Kf8-e7 Pd7-d8B Ke7xd8 >>>>> Ph2-h4 Kd8-e7 >>>>> 7 357 762 1623830 Qf6-g6 ! >>>>> 7 525 919 1926808 Qf6-g6 Kg8-f8 Qg6-h6 Kf8-g8 Qh6-g5 Kg8-f8 >>>>> Kh1-g1 Qd7xd5 >>>>> 7 -> 0:10.26 2108193 1 turn >>>>> 8 525 1161 2360687 Qf6-g6 Kg8-f8 Qg6-h6 Kf8-g8 Qh6-g5 >>>>> 8 -> 0:23.94 4694659 0 turns >>>>> 9 525 2935 5710337 Qf6-g6 Kg8-f8 Qg6-h6 Kf8-g8 Qh6-g5 >>>>> 9 526 3916 7666834 Qf6-g5 Kg8-f8 Pd5-d6 Pc7xd6 >>>>> 9 -> 1:10.73 13328419 1 turn >>>>> 10 526 8747 16329005 Qf6-g5 Kg8-f8 Pd5-d6 Pc7xd6 Pe5-e6 Qd7-b7 >>>>> Kh1-g1 Qb7-g7 Qg5xg7 Kf8xg7 Pe6-e7 Kg7-f7 >>>>> 10 -> 3:58.68 42938008 0 turns >>>>> 11 526 40425 71196909 Qf6-g5 Kg8-f8 Pd5-d6 Pc7xd6 Qg5-h6 Kf8-g8 >>>>> Pe5-e6 Qd7-b7 Kh1-g1 Qb7-g7 >>>>> 11 -> 17:32.80 184157117 0 turns >>>> >>>>So that's 7.62 seconds to switch to a different move. >>>>Phalanx has special knowledge that helps it to see >>>>those things quickly. It has huge extensions (like several >>>>full plies) on piece exchanges leading to pawn-only endgames. >>>> >>>>Dusan >>> >>> >>>I think you are overlooking the PV. IE it is _still_ showing a queen exchange, >>>just not instantly. IE at depth=10. Trading on g7. Doesn't matter where >>>you trade, white loses this if the b-pawn stays on the board. >> >>I think that programs have not time to extend enough in positions that are at >>distance of 10 plies from the root. >> >>Practically it can see that Qe6 is not good at the root and I guess that in a >>practical game it will also see 10 plies later the same problem. >> >>Uri > > >Maybe not. IE it doesn't seem to understand that the b-pawn is going to >win the game if queens come off. It doesn't matter whether you see it at >the root or at the tips. You either have to search deep enough to see this >problem, or realize that there are other moves that prevent it from happening, >completely. You are right. It does not understand it in the static evaluation function. I feel good detection of candidates is so difficult that you have to mimic a search in the static eval anyway. I think using extensions on right moves is better solution. > >I'm going to file this one away as it is critical to get these right. I have >the necessary code to detect this as won for black with no queens on, but I >don't quite do it yet for safety reasons. But it has to be done eventually. > >IE if you back those white pawns up and block them with black pawns, Crafty >will _instantly_ know to not trade queens as white, and will try to trade as >black. But that isn't enough to offset the passed pawns white has, yet... >yet being the operative word. :)
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