Author: Robert Hyatt
Date: 07:16:13 01/13/04
Go up one level in this thread
On January 13, 2004 at 09:31:01, scott farrell wrote: >On January 13, 2004 at 09:24:56, Robert Hyatt wrote: > >>On January 13, 2004 at 03:48:32, Andreas Guettinger wrote: >> >>>On January 12, 2004 at 17:47:07, Robert Hyatt wrote: >>> >>>>On January 12, 2004 at 17:34:52, Uri Blass wrote: >>>> >>>>>I do not see when it happens in crafty and note that it is not only a question >>>>>of speed when it is not clear what is faster and if I understand correctly >>>>>crafty may be wrong when a sequence of captures that is finished in trading >>>>>kings happens and it may happen in the endgames. >>>>> >>>>>[D]8/5r2/5k2/3R1p2/5K2/8/8/8 w - - 0 1 >>>>> >>>>>Rxf5+ is a good capture but based on SEE that let trading kings it can be >>>>>pruned. >>>>> >>>>>Uri >>>> >>>>No. It is not very frequent and doing the test will burn more time than >>>>avoiding the test saves, since the occurrence is so tiny. I simply ignore >>>>it totally... >>> >>>A gave my kings a value of +-Infinity. >>>Now, in such a case, wouldn't it stand pat anayway instead of capturing the >>>king? Because loosing a rook seems better than loosing a king. >>> >>>regards >>>Andy >> >> >>I do the same, so actually you might be correct, in that losing one king will >>stop the captures there in the minimax phase... > >I think you'll find URI set this up specifically, notice the rook _behind_ the >king, ready for an xray attack. > >if you take my King, I'll take yours with my rook !!! > >Scott I understood that for this case. And, as I said, it doesn't work correctly. However, for the _far_ more common case where a king is one of the attackers/ defenders, and only one king is involved, it works fine, even though it has the x-ray attacker/defender behind the king. I don't consider this to be significant enough to think about, myself. It would be easy to fix, but it would be a tad slower. SEE is already wrong too many times, such as with overloaded and pinned pieces...
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