Author: Wayne Lowrance
Date: 06:24:43 09/23/99
Go up one level in this thread
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
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