Author: leonid
Date: 11:07:27 04/29/01
Go up one level in this thread
On April 29, 2001 at 09:47:35, Uri Blass wrote: >On April 29, 2001 at 09:35:29, leonid wrote: > >>On April 29, 2001 at 08:46:37, Paul wrote: >> >>>On April 29, 2001 at 08:36:44, Uri Blass wrote: >>> >>>>On April 29, 2001 at 07:32:15, leonid wrote: >>>> >>>>>Hello! >>>>> >>>>>I know that I should never indicate here any position like this, but it is just >>>>>too seductive! Only really dedicated man or highly performant mate solver can >>>>>crunch it. >>>>> >>>>>[D]Qrbqkbr1/Qn3qPP/NQqQq1nB/1qNqQBq1/1Qq1q2Q/8/3RR3/4K3 w - - >>>>> >>>>>Please indicate your result. >>>>> >>>>>Thanks, >>>>>Leonid. >>>> >>>>Both Junior5.9 and chessmaster6000 believe that QxQ+ is an easy win. >>>> >>>>They do not suggest the same move but the evaluation of Junior5.9 is +3.31 pawns >>>>for white when the evaluation of chessmaster6000(ss=10) is +10.36 pawns for >>>>white. >>>> >>>>Junior5.9 says 1.Qexe6+ when Chessmaster6000(ss=10) says 1.Qbxd8+ >>>> >>>>Junior5.9 used 37 minutes and 11 seconds on p200 to get +3.31. >>>>Chessmaster6000(ss=10) needed 14 minutes and 58 seconds on PIII450 to get the >>>>+10.36. >>>> >>>> >>>>Uri >>> >>>I think it's a mate in 12, but can't participate coz I'm no champion ... :( >>> >>>Groetjes, >>>Paul >> >>If nobody will come with better result you will become champion by default. >> >>Salut to Champion! >> >>Leonid. > >I guess that it is mate in at most 11 moves. It could be so. Real number of moves I don't know. For sure, I can say that this is mate between 10 and 13 moves. If 12 moves, indicated by Paul, is not the guess but what really its program found, then it is mate in 10, 11 or 12 moves. I found mate for sure by selective in 13 moves. My program also searched position as far as 9 moves and indicated that mate in 9 do not existe. This is from where I became certain that this position is not easy. Will try, if I will have the chance, with my 600Mhz to look even 10 moves deep. Expected time is around 18 hours. It is difficult when you don't have free laptop for this work! >I have no idea what is the right move but I guess that it is not going to be >easy to prove that I am wrong. > >Junior5.9 likes Qexe6+ more and the score at iteration 11 is +3.61 for white. >Chessmaster6000(ss=10) suffered from an horrible branching factor at depth 6 >and needed almost 2 hours to get a score. For positions like this it is very possible. In previous position like the last one my branching factor went as far as 58. >The score at depth 6 is +10.60 so there is more evidence that Qbxd8+ is winning. I am looking here not for the move that is very promissing, because of its material advantage, but for move that lead to mate for sure. Salut, Leonid. >If it does not find a better move at this iteration I am going to stop it. > >Uri
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