Author: Jeremiah Penery
Date: 15:21:16 02/12/99
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On February 12, 1999 at 17:27:10, Paulo Soares wrote: >On February 12, 1999 at 12:33:53, blass uri wrote: > >>8/p2q4/4pQ2/p2p4/p1pQ1K2/2p2b2/1N1N1n1p/2B4k b - - 0 1 >> >>This is a study I composed a few years ago. >> >>black say mate in 17.5 against itself. >>I used Genius3 for many hours to help me to compose and to check the endgame. >> >>The main line is 1...e5+ 2.Kxf3 Qh3+ 3.Kxf2 Qg2+ 4.Ke1 exd4 5.Qf1+ Qxf1 6.Kxf1 >>cxb2 7.Bxb2 c3 8.Nb1 cxb2 9.Kf2 a3 10.Nxa3 a4 11.Nb1 a3 12.Nxa3 d3 13.Nb1 a5 >>14.Nd2 b1Q 15.Nxb1 a4 16.Nd2 a3 17.Nf1 a2 18.Ng3# >> >>Uri > >Uri, > > Fritz5.32 has problems with the promotions and it does not >obtain. > Genius6 has more knowledge in that it says respect to the >promotions and goes more far, look: > > PII-300 Ht=64Mb > > After 8... cxb2 > 9.Kf2 #10 depth16 14sec. > > After 7... c3 > 8.Nb1 #11 depth18 133sec. > > After 6... cxb2 > 7.Bxb2 depth20 >1200sec. > > I do not believe a program can solve this problem. Repairs >that I gave up after 20 minutes when Genius6 probably would >find #12 but, which would be the time necessary to find mate in >17,5? probably many months (years?). It is a problem that requires >much depth of analysis, and still has possible promotions of >pions on the part of the blacks. I think Uri is right when he says 5. Qf1+ is the hardest move for the computer to find. After making this move for it, Crafty finds a -Mat13 (Mated in 13) with the exact PV that Uri gives above. It did take a while (Maybe an hour or so, but I don't remember). I'm running it now from the beginning position with a Crafty I modified specifically to try and solve this position. Currently it is on ply 10, resolving a fail low. Here's some output: 10 1:35 -- 1. ... e5+ 10 181:15 1/31 1. ... e5+ It got to this ply in about 1 minute, and has been resolving the fail low for the last 3 hours. :) Maybe it'll solve it by Monday. Jeremiah
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