Author: leonid
Date: 11:02:05 09/21/99
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On September 21, 1999 at 10:45:58, Bernhard Bauer wrote: >On September 21, 1999 at 08:43:51, leonid wrote: > >>For those who like to solve an unusual mate position here is the next one. >>This is not that simple to find since this is the mate in 8 moves. Black >>goes and mate. >> >>Beyond the fun those positions are the best way to spot the bugs in the >>code. With positional move you can never say where your moves generator lies >>to you. With inevitable mate position you can verify it and feel you good. >> >>White pieces: >>1) Queens: F7,G7,H7,E6,F6,H6,F5,G5,H5. >>2) King on G6. >> >>Black pieces: >>1) Rooks: C7,D7.C4. >>2) Knights: G3,H3. >>3) Queens: F3,D2,E2,F2,F1. >>4) Bishops: B2,A1,B1. >>5) King: D1. >> >>I verified the position today. On AMD 400Mhz logic says that mate in 7 move >>do not exist. Took 9 minutes 5 second to say this. Solution in 8 moves was found >>through the brute force in 1 minute and 8 sec. Through "quick logic" solution in >>8 moves was found in 0.3 sec. >> >>Take care! This position can bring down your best game. >> >>Leonid. > >My best game (crafty16.18) running on a 450 MHz PC doesn't go down. > > 5-> 7.59 24.35 1. ... Qxf5+ 2. Qfxf5 Qxf5+ 3. Qexf5 > Rd6+ 4. Qg7f6 Qxf5+ 5. Kg7 Nxh5+ 6. > Qhxh5 Bxf6+ 7. Qxf6 Bxf6+ > 6 7.63 ++ 1. ... Qxf5+!! > 6 31.87 Mat08 1. ... Qxf5+ 2. Qfxf5 Qxf5+ 3. Qexf5 > Qxf5+ 4. Qfxf5 Nf4+ 5. Qxf4 Rxg7+ 6. > Q6xg7 Rxg7+ 7. Kh6 Qxf4+ 8. Qxf4 Qxh5# > 6-> 56.63 Mat08 1. ... Qxf5+ 2. Qfxf5 Qxf5+ 3. Qexf5 > Qxf5+ 4. Qfxf5 Nf4+ 5. Qxf4 Rxg7+ 6. > Q6xg7 Rxg7+ 7. Kh6 Qxf4+ 8. Qxf4 Qxh5# >Kind regards >Bernhard Very nice to hear. Between the games that likely to be very solid are: Chess Master, Genius and Rebel. Genius was the most helpful for me when I worked on my Mate Solving Logic. Few other games (around 50%) that I bought for verification of my logic (4 years ago) were useless. They not only managed to go down but make my system to be broken in few occasions as well. If somebody write in this moment his logic and want verify it by using the "inevitable mate positions" it can find them on address: http://www.geocities.com/iparticle Many of the positions that are there were found in all kind of books and Chess Life publications. Many positions are completely unique and done for fun and practical application. Leonid.
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