Author: Paulo Soares
Date: 19:32:37 02/12/99
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On February 12, 1999 at 18:21:16, Jeremiah Penery wrote: >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 Jeremiah, Which is the Hardware that you are using? I find impossible that until monday the problem can be solved, even so has been surprised with #13 found by Crafty. What version of Crafty? Best regards, Paulo Soares,from Brazil
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