Author: Ed Schröder
Date: 11:18:45 10/08/97
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>In Reply to: Re: Mate in 4 explanation posted by Ed Schröder on October 08, >1997 at 04:14:12: >On October 08, 1997 at 04:14:12, Ed Schröder wrote: >>>5rk1/1pnqb1r1/p2pRp2/2pP1PpQ/P1P1NpP1/3B1P2/1P1K4/7R w - - id=Shirov,A - >>>Lillo Ferrer,J; bm=e4g5; >>>I was reviewing this game with analysis mode with Rebel 8(K6-200) >>>when the above position arose. For some reason Rebel could not find >>>the mate in 4 move Ne4xg5. What is it about this position that might >>>explain this? When I set Rebel 8 to "find mate in 4" mode it is found >>>instantly. >>This is one of the rare cases Rebel selective search fails. >>You can check this to set Rebel8 on "brute force", see options. >>Rebel8 will find Nxg5 M4 on ply 5. >>Also SEL=1 / SEL=2 etc. will give improvements. >>- Ed - >>BTW, thanks for the position. I collect them and if there is a pattern >>it's not so difficult to make improvements. >Ed, >Can Rebel9 quickly find the mate in 4 move Ne4xg5 using Normal >Selection? No, also Rebel9 suffers here. Same story as Rebel8. >Can Rebel9 find the mate in any move in other games using Normal >Selection much faster and much better than Rebel8? Set "Combination=ON" in the OPTION menu. Rebel8/9 will find combinations generally 20-30% faster by special pruning. During this year I have done some experiments finding combinations faster. The idea: if the current game is a position and no moves played yet, extend *some* moves from the move list with 3 plies. I got wonderful solution times but if the algorithm failed a slow down of 50-100% was noticed. I finally rejected implementation of the idea because people would consider it as cheating. - Ed - >I don't expect Rebel chess program to be perfect, but I always feel >better when Rebel chess program gradually gets closer and closer to >perfection. :) >Thanks, >Eran :) >Considering about buying Rebel9 in the future.
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