Author: blass uri
Date: 01:09:45 10/05/99
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On October 04, 1999 at 22:14:01, Stephen A. Boak wrote: >On October 04, 1999 at 20:24:14, blass uri wrote: > >>On October 04, 1999 at 15:11:45, Dave Gomboc wrote: >> >>>This might be a really interesting position to check out. Did you record it? >> >>Here is the relevant position: >>7k/4K2p/7P/3p4/8/4Q3/1q6/8 w - - 0 1 >> >>Fritz5 find the right move Ke6(leading to mate) but the evaluation is strange >>evaluations of Fritz5: >> >>depth 8 0.00 >>depth 9 5.16 >>depth 10 4.81 >>depth 11 4.50 >>depth 12 4.00 >>depth 13 3.69 >>depth 14 3.38 >>depth 15 3.06 >>depth 16 2.75 >>depth 17 2.44 >>depth 18 2.13 >>depth 19 1.81 >> >>Uri > >Seems like a bug (unintentional and bad) to me, not a feature. :) >Rebel10c finds White Ke6 in a split second, and after 13 seconds, on ply 9.00 it >finds and announces Mate in 8 for White. During the earlier ply searches, and >until the mate is discovered, it shows approx 1/3 pawn advantage for White. > >I wouldn't extrapolate what intentionally programmed features of the program >might cause this strange behavior of Fritz (a mix of Brute Force with Selective >Search, for one example) but instead would chalk it up to a bug in Fritz's >programming. If Fritz has reached 19 plies without discovering the mate (15 >plies only), there is obviously something wrong (my opinion only) with the >working of Fritz (whether intentional or unintentional). Maybe there is more >than one (or more than one successive) quiet move by white in the mate, which >cause Fritz to miss it (null-mover problem?). Ke6 threats nothing. Try the position after Ke6 with white to move and you can see that it is a null move problem Uri
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