Author: Uri Blass
Date: 11:13:48 03/07/06
Go up one level in this thread
On March 07, 2006 at 10:39:40, Will Singleton wrote: >On March 07, 2006 at 03:33:12, Richard Pijl wrote: > >>On March 06, 2006 at 22:53:05, Dann Corbit wrote: >> >>>Lot's of programs have a problem with this one. It's a sacrifice leading to a >>>forced mate. I would not worry about this one too much: >>>[D] 4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - bm Qxf4 >> >>Single reply extensions, mate threat extensions and checks in quiescense search >>all help in finding this one quickly. Down-side: When used unrestricted, >>searches will explode. I agree here with Dann, don't worry about this one. >>The Baron finds the move in 7.6 seconds on a Xeon 2.8, reporting the mate in 48 >>seconds. >> >> ply time nodes score pv >> 2( 3)- 0:00.00 285 -1.23 Kg2-g1 (Re8-e2) >> 2( 3)& 0:00.00 383 -1.70 Kg2-f1 Kg8-f8 >> 2( 3). 0:00.00 414 -1.70 Kg2-f1 Kg8-f8 >> 3( 5)& 0:00.00 757 -1.44 Kg2-f1 Kg8-f8 Qc1-d2 >> 3( 5). 0:00.00 903 -1.44 Kg2-f1 Kg8-f8 Qc1-d2 >> 4( 7)& 0:00.02 2352 -1.58 Kg2-f1 Kg8-f8 Bf6-g5 Nf4-e2 >> 4( 7). 0:00.02 2880 -1.58 Kg2-f1 Kg8-f8 Bf6-g5 Nf4-e2 >> 5( 9)& 0:00.09 14038 -1.70 Kg2-f1 Re8-e2 Kf1-g1 Re2xf2 Qc1-e1 >> 5( 9). 0:00.09 15667 -1.70 Kg2-f1 Re8-e2 Kf1-g1 Re2xf2 Qc1-e1 >> 6(12)& 0:00.28 44250 -1.81 Kg2-f1 Re8-e2 Kf1-g1 Re2xf2 Qc1-e3 >> Rf2-g2 Kg1-f1 Kg8-h7 >> 6(12). 0:00.30 48368 -1.81 Kg2-f1 Re8-e2 Kf1-g1 Re2xf2 Qc1-e3 >> Rf2-g2 Kg1-f1 Kg8-h7 >> 7(13)& 0:00.97 153287 -1.93 Kg2-f1 Re8-e2 Rh1-h2 Kg8-f8 a2-a4 >> b5xa4 Bb3xa4 Nf4-d3 >> 7(13). 0:01.45 232925 -1.93 Kg2-f1 Re8-e2 Rh1-h2 Kg8-f8 a2-a4 >> b5xa4 Bb3xa4 Nf4-d3 >> 8(16)+ 0:04.75 784071 -1.58 Kg2-f1 (Re8-e2) (Rh4xf4) (Bd6xf4) (Qc1-b1) >> >> (Rd7-e7) (Qb1xg6) (Kg8-f8) (Bf6xe7) >>(Qc7xe7) (Qg6xf7) >> 8(16)& 0:07.05 1186288 -1.03 Kg2-f1 Rd7-e7 Bf6xe7 Re8xe7 Rh1-g1 >> Kg8-f8 Rg1-g5 f7-f6 Rg5-g3 >> 8(16)+ 0:07.61 1302604 -0.33 Qc1xf4 (Bd6xf4) (Rh4xh5) (g6xh5) (Rh1xh5) >> (Bf4-h6) (Rh5xh6) (Kg8-f8) (Rh6-h8) >> 8(17)& 0:47.89 10652406 MATE6 Qc1xf4 Bd6xf4 Rh4xh5 g6xh5 Rh1xh5 >> Bf4-h6 Rh5xh6 Qc7-h2 Kg2xh2 b5-b4 Rh6-h8 >> 8(17). 0:48.12 10697945 MATE6 Qc1xf4 Bd6xf4 Rh4xh5 g6xh5 Rh1xh5 >> Bf4-h6 Rh5xh6 Qc7-h2 Kg2xh2 b5-b4 Rh6-h8 > >Based on the performance of several progs, it's possible that this is a position >you should worry about. Most find the mate in 5 secs or less. > >Will I think that finding the mate fast is not very important. It is more important to find the move fast but it is also not the most important thing. public Movei is even slower than the baron in finding the move. Movei can find it relatively faster if I remove pruning based on evaluation but removing pruning based on evaluation is going to make it play weaker. Latest movei fail high on the move faster because I improved my condition of pruning based on evaluation but it still cannot find the mate fast and only find high score with no mate first. Uri
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