Am 12.07.2011 11:54, schrieb Petr Baudis:
Hi!
On Tue, Jun 21, 2011 at 02:13:50PM +0200, Olivier Teytaud wrote:
I have posted too quickly - after all I have something which works both for
black and white and for various board sizes, using
the "rule 42" spirit. Good news :-)
Glad you got it to work! I updated the preprint on my homepage, now it
also contains a graph for handicap games when taking white and shows
great effectivity of value-based situational dynamic komi. :-)
Have you gotten some significant improvements from applying this in
even games as well? I managed to get only small performance boost, even
though my feeling is the whole search process behaves quite differently.
Also, are you using a ratchet-like mechanism like I described in my
paper? Exactly why it works the way I found it does is still somewhat
a mystery for me...
Just a hand waving explanation for the ratchet: you simply cannot afford
to cede ground to black when giving a handicap.
Even though the playouts do not model a weak response by black, a
winrate of 42% implicitly does assume a weaker opponent.
When the winrate starts dropping at the current komi level, that
probably means that the weaker player is going head to head instead of
retreating.
It that situation white must conquer or perish.
Stefan
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