Author: Mike S.
Date: 11:04:03 04/30/04
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On April 30, 2004 at 12:01:53, fabio calamassi wrote: >Everything is possible, however i'm surprised; in these simple positions the >engines have an elemental work to make!! Fritz 8 and Shredder 8 are the best or >not? There is a search technique which makes engines better in most of the cases, but is a problem when there is *zugzwang*. Then, it can be counterproductive (some engines handle that in an improved way, but obviously it can't be done perferctly). It is possible that in your position, the nullmove problem prevents the engines from finding the fast mate whith Qa2! (puts black in zugzwang). If Black wouldn't have to move now, White would need two more moves to mate (not one). - Although, when some engines simply switch off nullmove below a certain material value on the board, it shouldn't be affected, assuming this position has less material than that threshold usually is (?). (Programmers would be able to explain that better or verify my assumptions :-)) [D]8/8/7p/4K1kb/8/7R/7Q/8 w - - 0 1 Analysis by Chess Tiger 14.0: 1.Rxh5+ Kg6 2.Rxh6+ Kf7 3.Rh8 Ke7 4.Qh7# +- (#4) Depth: 7 00:00:00 350kN 1.Qa2 Bg4 2.Qg8# +- (#2) Depth: 7 00:00:00 416kN +- (#2) Depth: 9 00:00:02 1916kN Tiger is usually very good in finding fastest mates, but still, it has to calculate to depth 7 here for a #2. Analysis by Fritz 7: 1.Qa2! +- (#2) Depth: 4/13 00:00:00 7kN +- (#2) Depth: 4/13 00:00:00 7kN (no problem yet with F7) Regards, M.Scheidl
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