Author: Pete Galati
Date: 20:03:46 01/18/01
Go up one level in this thread
On January 18, 2001 at 22:21:05, leonid wrote: >On January 18, 2001 at 22:06:37, leonid wrote: > >>On January 18, 2001 at 19:13:22, Paul wrote: >> >>>On January 18, 2001 at 19:01:08, Pete Galati wrote: >>> >>>>On January 18, 2001 at 18:44:05, leonid wrote: >>>> >>>>>Hi! >>>>> >>>>>If you would like to find a mate here is one position. It is very easy to solve >>>>>but not that simple to find shortest mate. >>>>> >>>>>I failed here even in 3 hours to find shortest mate through brute force search. >>>>>Maybe you will have better chance. >>>>> >>>>> 1k4q1/1pppPr2/PbbP1N1n/QP2rn1R/1q6/1q2RBB1/q1q2PPP/6NK black to go >>>>> >>>>>Leonid. >>>> >>>>Is this the right position? >>>> >>>>[D]1k4q1/1pppPr2/PbbP1N1n/QP2rn1R/1q6/1q2RBB1/q1q2PPP/6NK b - - 0 1 >>> >>>If so, then mine says it's a mate in 10 for black starting with Nxg3+ ... >>>It looks like a daily reverse auction ... Anyone lower, anyone? :) >>> >>>Paul >> >>Position is exact and response 10 moves must be or shortest possible, or very >>close move. Actually my program solved this position through selective search in >>11 moves. Solution was instant. Finding shortest mate is the other story. >>Through brute force program said in 8 mate is not there. Only 9 still could be >>looked. > > >Mistake! My program solved this position not by 11 moves selective search but by >10. Found this when I went to program and solved this position once again. My >mistake came probably from the fact that I created today around 5 or 6 different >positions. Few of them were solved by 12 and 11 moves. Only one, that I liked >the most, I put here. > >Leonid. I thought for a minute that the Chessbase native version of Comet had done it in 9 moves, but I was thinking, how could this be, but I took a closer look, and what Comet was calling 9 moves was 10 moves to everyone else. Oh well. 1...Nxg3+ 2.hxg3 Rxh5+ 3.Nxh5 Qh4+ 4.gxh4 Qxg2+ 5.Bxg2 Bxg2+ 6.Kh2 Ng4+ 7.Kg3 Qxe3+ 8.fxe3 Qf2+ 9.Kxg4 Qe6+ 10.Kg5 Qff5# -+ (-#9) Depth: 8/37 00:12:17 187568kN (Galati, ` 18.01.2001) Pete
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