Author: Dave Gomboc
Date: 16:05:20 05/05/99
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On May 05, 1999 at 18:55:03, Paul Richards wrote: >Well, you can't help things scrolling away on these WebBBS things, >but yours looked like a new post, so it's probably better to make >it self-contained and include all the information. Looks sort of >funny just to say 18 f5!. ;) > >I played with the position for some time using Fritz 5.32 on a >fast machine, and at 15 ply it still liked N5e4 Nd5 f5, delaying >f5 by one move, but while white would probably still win eventually, >f5 looks best. I would probably have to let it run overnight for >Fritz to find it. > >Strange thing though, as is so often the case, once you supply >the correct move, it sees the continuations immediately at a much >shallower depth. So then why the hell doesn't it see it by 15 ply? >It really does seem as though correspondence analysis would find >these thing faster. In other words, at 15 ply it doesn't see f5 >as best, yet as soon as you supply f5, it sees it winning within >10 or 11 ply. It doesn't get confused by any drawing chances >either, it easily finds a clear win. Anyway here is Fritz 5.32 >analysis of the winning line: > >FEN "r4rk1/pp2qpp1/nnp1p2p/2b1P1N1/2P2P2/6N1/PP2Q1PP/R1B2R1K w - - 0 1" > >1. f5 hxg5 > (1... Qc7 2. N5e4 Qxe5 3. Qg4 Kh8 4. f6 Rg8 5. Qh4 Bf8 > 6. Ng5; +6.44 pawns) >2. f6 Qc7 > (2... gxf6 3. Ne4 f5 4. Nf6+ 4... Qxf6 losing the queen, > else 4...Kg7 leads to mate in 8, 4...Kh8 = mate in 2.) >3.fxg7 Kxg7 4. Bxg5 f5 5. exf6+ Kh8 6. Bh6 Rf7 7. Qh5 Rh7 >8. Bg7+ Kg8 9. f7+ Kxg7 10. Qg5+ Kf8 11. Qg8+ Ke7 12. f8=Q+ Rxf8 >13. Rxf8 +5.34 pawns. Pruning might be to blame. !? Dave
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