Author: Robert Hyatt
Date: 06:43:20 09/23/99
Go up one level in this thread
On September 23, 1999 at 09:24:43, Wayne Lowrance wrote: >On September 22, 1999 at 22:54:07, Robert Hyatt wrote: > >>On September 22, 1999 at 20:25:56, Howard Exner wrote: >> >>>On September 22, 1999 at 13:42:26, Robert Hyatt wrote: >>> >>>>On September 22, 1999 at 13:40:37, Robert Hyatt wrote: >>>> >>>>>On September 22, 1999 at 11:46:29, Howard Exner wrote: >>>>> >>>>>>Do any of the programs with endgame tablebases solve this position? >>>>>> >>>>>>8/6Bp/6p1/2k1p3/4PPP1/1pb4P/8/2K5 b - - id Pos 111 - ECM98H.EPD; bm b3b2 >>>>>> >>>>>>It looks too difficult for non tablebase programs. >>>>> >>>>> >>>>>Crafty solves it, but it takes longer than I would like to see... 11 minutes. >>>>> >>>>>here is the output: (quad xeon with all the 5 piece ending databases). >>>>> >>>>> 15-> 1:46 -0.09 1. ... Kd6 2. Bf8+ Ke6 3. f5+ Kf6 4. >>>>> Kb1 Bd4 5. Ba3 h6 6. Bb2 h5 7. Bxd4 >>>>> exd4 8. Kb2 hxg4 9. hxg4 d3 10. Kxb3 >>>>> d2 11. Kc2 >>>>> 16 2:21 -0.17 1. ... Kd6 2. Bf8+ Ke6 3. f5+ gxf5 >>>>> 4. gxf5+ Kf6 5. Bc5 h5 6. Kb1 Kf7 7. >>>>> Ba3 Kf6 8. Kc1 h4 9. Bb2 Be1 10. Kd1 >>>>> Bf2 >>>>> (3) 16-> 4:07 -0.17 1. ... Kd6 2. Bf8+ Ke6 3. f5+ gxf5 >>>>> 4. gxf5+ Kf6 5. Bc5 h5 6. Kb1 Kf7 7. >>>>> Ba3 Kf6 8. Kc1 h4 9. Bb2 Be1 10. Kd1 >>>>> Bf2 >>>>> (2) 17 6:09 -0.26 1. ... Kd6 2. Bf8+ Ke6 3. f5+ Kf6 4. >>>>> Ba3 Bd4 5. Kb1 Bc3 6. g5+ Kf7 7. f6 >>>>> Bd2 8. Bc1 <HT> >>>>> 17 11:26 0.00 1. ... b2+ 2. Kc2 exf4 3. Bxc3 f3 4. >>>>> Be1 Kd4 5. Bf2+ Kxe4 6. Ba7 Kf4 7. >>>>> Bf2 Ke4 >>>>> (4) 17-> 11:42 0.00 1. ... b2+ 2. Kc2 exf4 3. Bxc3 f3 4. >>>>> Be1 Kd4 5. Bf2+ Kxe4 6. Ba7 Kf4 7. >>>>> Bf2 Ke4 >>>>> >>>>>Don't know whether it will fail high at 18 or not, however... >>>> >>>> >>>>depth 18 analysis: >>>> >>>> (3) 18 13:55 0.31 1. ... b2+ 2. Kc2 exf4 3. Bxc3 f3 4. >>>> Be1 Kd4 5. Bf2+ Kxe4 6. Ba7 b1=Q+ 7. >>>> Kxb1 Kd3 8. h4 Ke2 9. h5 gxh5 10. gxh5 >>>> f2 11. Bxf2 Kxf2 12. Kc2 Ke3 >>> >>>I tried this on CM6000 and Rebel 10c but stopped after 30 minutes(this >>>on an AMD 233). The 11 minutes looks impressive to me. In your final analysis >>>on move number 9 rather than capturing with gxh5 the winning move is g5, >>>so that the black king can capture both of white's pawns. However in an actual >>>game Crafty would no doubt see that when it reached that point in the game. >>> >>>My guess is that we won't see to many people posting that program X >>>finds this one. Hope I'm wrong in this guess. >>> >>>Now I'm also wondering if tablebases will help here as after the initial >>>exchanges there remain two pawns each on the king's side? >> >> >>It was definitely probing tablebases during the search. The disk was very >>active due to the captures... > >Yes, Hiarcs was probing table bases during its search as well. Hiarcs found the >solution at the 21:04 minute mark and made the move shortly there after. The >Table Base print out that followed the Hiarcs search listing was: > >=+ (-0.26) depth 13/30 00:21:04 72203kn, tb=12 what does "tb=12" mean? My program did over 60,000 probes. If that means only 12 were done, something is not done right in Hiarcs...
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