Don Dailey wrote:
You can use Zobrist hashing for maintaining all 8 keys incrementally,
but you probably need a fairly good reason to do so. Incrementally
updating of 1 key is almost free, but 8 might be noticeable if you are
doing it inside a tree search or play-outs.
Yes. Don is right. Of course that is not part of the real program, but
of a program that searches the book. In my case (19x19 only) I play a
maximum of 20 moves (10 per player) from the book and then switch to
the "real" program.
I never shared the naif idea that some openings (played by high dan) are
better than others and that finding a correlation between a given move
and the result of the game was meaningful. I consider all "popular"
openings equally balanced and playable. Finding a move in the book
just saves you the time of 4-5 moves (10 if you are really lucky), gives
you a straightforward way to randomize the opening (drawing between all
moves in the book uniformly) and makes the board contain some information
when the real thing starts.
Jacques.
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