Author: John Bartkiw
Date: 14:47:16 12/17/97
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>
>
>I use both, because I can try killers before I generate any moves. If I
>get a cutoff, it is really inexpensive. I didn't notice any particular
>tree size advantage when I added killers, but I noticed a 10% speed
>improvement because of trying them before generating any non-capture
>moves.
>
Just a question. How can you try killers if you don't know if the
move is valid? If the last move made the killer not legal.
I've just started working on my program and have noticed that a tonne of
my cycles are used generating moves. I'm using the bitboard approach
along with a make move and unmake move function.
To generate my list of moves I make every possible move to see if
it's valid (ie. doesn't reveal a check) and then after I've done that I
start the whole search. The making and unmaking of the moves twice
(once to check if it's valid and then later when actually searching) is
really killing my nps.
Is there a better approach??
John.
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