Many Faces reads ladders in both the tree and the play outs. In play-outs
Aya reads ladders only in tree. In play-outs Aya checks killing
two libs stones without search. So it can understand only easy
cases up to 3 plies, but it was effective. I tried ladder in
play-outs before, but I could not get good result.
Regards,
Hiroshi Yamashita
----- Original Message -----
From: "David Fotland" <[email protected]>
To: <[email protected]>
Sent: Wednesday, May 15, 2013 10:45 AM
Subject: Re: [Computer-go] ladder
Many Faces reads ladders in both the tree and the play outs. In play-outs
we already had a rule "don't play self atari (with many exceptions)". A
similar rule is "don't play a move that is captured in a ladder (with many
exceptions)". The moves that play out the ladder are not made in the
play-out itself, but ladders are evaluated as mart of the play-out move
generation policy. Once you have heavy play-outs, the overhead of reading
ladders is not very high.
In the tree portion, I use the Many faces of Go engine to bias moves, and it
does tactical local search for up to 3 liberties, not just simple ladders.
David
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