Author: allan johnson
Date: 02:51:30 12/18/99
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On December 17, 1999 at 17:10:12, Albert Silver wrote: >I seem to have run across a bizarre problem and wonder if this might not be a >bug in Fritz (5 or 6) or one of the infamous null-move problems. I was analyzing >the following position which was part of some analysis done on >Yakovich-Stefanova, Sevilla op, 1999: > >r4rk1/p3bppp/nn6/1N6/Ppp1P3/1P2BP2/N3K1PP/R2R4 w - - 0 18 > >In this position the indicated move is 18.Nxa7! Fritz never finds this (at least >up to 14 plies) and I decided to check the lines which follow: 18...cxb3 and >here again, Fritz sees nothing for White and the eval drops with each ply; yet >as soon as I feed it the next move 19.Bxb6 its eval shoots up in White's favour. >What gives? > > Albert Silver Albert Rebel C on my Celeron 433 plays Nxa7 within 4 seconds with a score of 0.80.The score, however, goes down over the next few moves.(Nxa7 Rxa7 Bxb6 Rb7 Bd4 c3 Rac1 Rc8 f4 Rd7 0.24) CM6000 plays Nxa7 also but with an initial eval of 0.53.It,too,drops after Nxa7 cxb3 BxB6 bxa2 Rxa2. Is it supposed to be a win for white? Fritz 5.32 doesn't consider Nxa7 but maybe the move, as Paul says, is not winning. Cheers Allan
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