Author: John Merlino
Date: 08:59:52 07/25/02
Go up one level in this thread
On July 24, 2002 at 17:56:04, Nolan Denson wrote: >Ok i was trying to read up on extension and ran across this conversation. So >what I am wondering how much have we improved with todays programs and faster >computers ... ( This post will be the first time that i see this position) it >may be a test problem now. > >>Posted by Howard Exner on January 09, 1998 at 21:03:51: > >[D]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 :)) Chessmaster 9000 says Mate in 7 in 2 seconds on a PIII-733: Time Depth Score Positions Moves 0:00 1/3 0.66 2942 1.Bh6 Bxh6 2.Qxh6+ Ke7 3.Qg5+ Kd7 0:00 1/4 0.77 9436 1.Bh6 Bxh6 2.Qxh6+ Ke7 3.Qg5+ Kf8 4.Rh8+ Kg7 5.Qh6+ Kf6 0:00 1/5 0.76 33149 1.Bh6 Bxh6 2.Qxh6+ Ke7 3.Qg5+ Kd7 4.e3 0:00 1/6 0.78 51968 1.Bh6 Bxh6 2.Qxh6+ Ke7 3.Qg5+ Kd7 4.Rh7 Kc8 5.e3 0:01 1/7 0.64 118731 1.Bh6 Bxh6 2.Qxh6+ Ke7 3.Qd2 b6 4.Qg5+ Kd7 5.Rh7 Kc8 0:02 1/7 Mate08 156536 1.Qh8+ Bxh8 2.Rxh8+ Kg7 3.Rh7+ Kxh7 4.Bf6 Bxg4 5.Bxg4 g5 6.Bf5+ Kg8 7.Rh1 e4 8.Rh8# 0:02 1/7 Mate07 168411 1.Qxg7+ Kxg7 2.Rh7+ Kxh7 3.Bf6 Bxg4 4.Bxg4 g5 5.Bf5+ Kg8 6.Rh1 e4 7.Rh8# 0:02 1/8 Mate07 216345 1.Qxg7+ Kxg7 2.Rh7+ Kxh7 3.Bf6 Bxg4 4.Bxg4 g5 5.Bf5+ Kg8 6.Rh1 e4 7.Rh8# 0:03 1/9 Mate07 364005 1.Qxg7+ Kxg7 2.Rh7+ Kxh7 3.Bf6 Bxg4 4.Bxg4 g5 5.Bf5+ Kg8 6.Rh1 e4 7.Rh8# jm
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