Author: Uri Blass
Date: 15:34:40 09/29/04
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On September 29, 2004 at 18:20:45, martin fierz wrote: >On September 29, 2004 at 16:21:43, Uri Blass wrote: > > >>I think that it is clear that extending every nate threat by a full ply will >>blow your search. >> >>If you do not use partial extensions then I suggest that you do not extend mate >>threats unless you have some conditions to extend them only near the root and >>not every where. >> >>Uri > >i extend mate threat by a full ply always. and my search isn't blowing up, at >least not that i notice. then again, WAC 141 shows some strange behavior with my >latest version: > >MUSE 0.89.10 UCI 30 MB: > > 1 00:00 -1.65 Kg2g1 > 2+ 00:00 -2.36 Kg2f1 > 2 00:00 -2.36 Kg2f1 Nf4d3 > 3 00:00 -1.22 Kg2f1 Re8b8 Kf1e1 > 4 00:00 -2.13 Kg2f1 Kg8h7 Bb3d1 Nf4d3 > 5 00:00 -2.16 Kg2f1 Re8e2 Kf1g1 Nf4d5 Kg1f1 > 6+ 00:00 -1.66 Qc1xf4 > 6 01:24 M6 Qc1xf4 Bd6xf4 Rh4xh5 g6xh5 Rh1xh5 Bf4h6 Rh5xh6 > >it sees Qxf4 after 0 seconds (this is on a slowly 1.4GHz P4), but needs a very >long time to resolve it. but at least it sees Qxf4 in 0 seconds :-) > >cheers > martin If you extend also checks by a full ply then there are cases when there is a long sequence check ,escape threat mate,check,escape threat mate and it means that you may have big problems to search deep in position when one side threats mate but the opponenthas a lot of checks because he tries to do perpetual checks. You can easily search some lines to more than 100 plies at small depth and I do not believe that it is a good idea. Uri Uri
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