Author: Robert Hyatt
Date: 18:49:28 03/07/06
Go up one level in this thread
On March 07, 2006 at 19:16:31, Stuart Cracraft wrote: >On March 07, 2006 at 15:47:26, Robert Hyatt wrote: > >>On March 07, 2006 at 14:13:48, Uri Blass wrote: >> >>>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 >> >> >>Latest Crafty looks like this: >> >>starting thread 1 >> 8 0.19 +1 1. Kf1!! >> 8 0.80 -1.51 1. Kf1 Rc8 2. Rg1 a5 3. Bg5 Nd5 4. >> Kg2 Re8 5. Bxd5 cxd5 >> 8-> 0.82 -1.51 1. Kf1 Rc8 2. Rg1 a5 3. Bg5 Nd5 4. >> Kg2 Re8 5. Bxd5 cxd5 >> 9 1.55 -1.22 1. Kf1 Ra8 2. Bc2 Rc8 3. Be4 Nd5 4. >> Bxd5 cxd5 5. Qh6 >> 9 1.83 +1 1. Qxf4!! >> 9 1.89 +3 1. Qxf4!! >> 9 2.02 +M 1. Qxf4!! >> 9 9.87 Mat06 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6 >> 4. Rxh6 Qh2+ 5. Kxh2 Kf8 6. Rh8# >> 9-> 9.88 Mat06 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6 >> 4. Rxh6 Qh2+ 5. Kxh2 Kf8 6. Rh8# >> 10 10.18 Mat06 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6 >> 4. Rxh6 Qh2+ 5. Kxh2 Kf8 6. Rh8# >> 10-> 10.20 Mat06 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6 >> 4. Rxh6 Qh2+ 5. Kxh2 Kf8 6. Rh8# >> >>It sometimes does not find the mate at depth 9 due to late move reductions >>interfering somewhere along the way. but it always finds the move Qxf4 very >>quickly, and always has a score of +10 or better even when it fails to find the >>mate, which is enough for me... >> >>The above on my dual xeon 2.8ghz hardware... > >Bob - you're slacking. I always remember you talking about your >quad xeon in the past. I used to have a quad 700mhz xeon. A few years back I replaced it with a dual 2.8, which is at least 2x faster...
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