Author: Gerd Isenberg
Date: 12:40:12 08/30/04
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On August 30, 2004 at 14:03:49, Dan Honeycutt wrote: >In spite of Dr. Hyatt's admonishment that this was a loser in Crafty, I'm bent >on trying it. Since I do legal move generation I can do the pins for half price >- I either have or can use the pin data for one side in conjunction with >generating moves. I just finished the routine. My NPS dropped by just over 4% >on bench test psitions. I've just started testing an hope to have some >indication if pin detection is a win, lose or draw in a few days. > >One aside - the pin detection is not always more accurate (or mine isn't). In >the following position for the move Nxg5 the no-pin SEE correctly returns +1 >where the pin-detection SEE comes back with -2. > >[D] 7k/4q3/8/6p1/4N3/5N2/8/4K3 w - - > >Fixing this would require keeping track if the pinning piece enters the >exchange, which I'm afraid would bee too expensive. Probably smarter not to consider pins with your SEE implementation. If you try mirrored positions, i guess Nxg4 or Nxb5 returns a correct +1 SEE. There are errors in qsearch anyway. Missing a good capture is probably worse than sometimes trying a "bad" one. OTOH if you already have computed pinned pieces, it makes sense to use that information not only for move generation. Gerd > >Dan H.
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