Author: Mike Adams
Date: 18:01:49 09/22/00
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I have done some modifications in pulsars mate detection which seems to
help. to early to see how it affects icc ratings. Pulsar will not try to get
out of check necesarily in qsearch but it will return checkmate now rather than
being allowed to pass on the move when in checkmate in qsearch. With this
improvement pulsar avoides the mate with a depth 4 search without nullmove and
depth 5 with null move. This is a lot better than depth 7 it was before.
The position actually was a rook sack not a queen sack. The queen at issue
was pulsar's meaning that pulsar could delay the mate by 2 moves if it gave up
its queen otherwise it was mate in 3 after pulsar's bad move. But your point
probably applies just as well since a rook sack would probably have a similar
affect to a queen sack on null move. I think one additional modification that
would help is that if pulsar searches depth 4 and all is dandy then it searches
3 moves in depth 5 and gets the abort search command but all 3 moves on depht 5
return checkmate for pulsar, pulsar should continue to search the current depth
and use more than its alloted time in the hopes of finding its way out of the
checkmate. I noticed that depth 5 was a very slow search since its move
ordering at the root was invalidated once it realized that its depht 1 2 3 and 4
search results were no good. So it may help to have more time for such
dangerous positions.
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