Author: Howard Exner
Date: 01:47:52 01/10/98
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On January 10, 1998 at 04:06:40, Ed Schröder wrote: >>Posted by Howard Exner on January 09, 1998 at 21:03:51: > >>>r3rk2/ppq2pbQ/2p1b1p1/4p1B1/2P3P1/3P1B2/P3PPK1/1R5R w - - id"Seiriwan - >>>Sokolov,A" bm Qxg7+; > >>I am always interested in the problems that program X finds quickly >>while program Y struggles. It makes me curious as to what makes them >>tick. Rebel 8 for example finds WAC 141 rather quickly but has a very >>hard time finding this above mate in 7. I think it is the quiet move, >>Bf6 that is the stumbling block for Rebel. > >I checked with Rebel9. Rebel9 needs 22:00 and 11 plies. > >The "killer" here is not 3.Bf6 but 6.Rh1 > >The main variation found: > >1.Qxg7 Kxg7 2.Rh7+ Kxh7 3.Bf6 g5 4.Be4+ Bf5 5.Bxf5+ Kg8 6.Rh1 and >mate on the next move. > >I am currently working on a better tactical version. It finds 1.Qxg7 >in 3:28 on ply 9 but the version in question is 25-30% slower in normal >positional play. > >As always the big question remains if "improved" tactics will result >in an overall improvement. > >For the moment I have baptized this version as Rebel Turtle and I hope >auto232 will tell me more. > >I receive a lot of input from customers. Sometimes they tell you >something you will not forget your whole life. One of them once said: > > "You guys release new versions and every new version only does > better on points where it was already good" > >While I believe this is not the entire truth the man has a point :)) > >Or? Rebel 8 fairs a bit better on this one. Mate in 7 at ply 10 in 6:42. Lately I've been playing Rebel 8 with my preferred setting of Selection set to 4 combined with Agressive mode. With these settings it finds it at ply 9 in 2:24 (K6-233 MHz).
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