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Re: [Bug-gnubg] GnuBG
Re: [Bug-gnubg] GnuBG
Sat, 24 Feb 2018 22:03:31 +0100
On Sat, Feb 24, 2018 at 02:38:22AM +0400, gela devadze wrote:
> When I am setting up a difficult of game on "Grand Master" mode,
> that I am pressing button (CHANGE), after that I dont know how to set up
> movements layer.
> for example: - 1ply - 2ply - 3ply - 4ply.
I don't see a "change" button, I suppose you mean "modify" in the Move
filter part of the settings (or use another language than the default).
The play level setting is a combination of a lookahead depth (the plies
number) and a move filter. The idea of the latter is that since
lookahead takes time (every additional ply is about 21 times slower
than the preceding one), moves are evaluated at 0-ply, without
lookahead, first and only those that don't seem hopeless at this level
are evaluated more thoroughly.
Grandmaster is 3 plies with a "large" move filter. The modify button
shows what large means here. Since this is a 3 plies evaluation, the
relevant part is the 3-ply one. It should have the 0-ply filter enabled
with : "always accept 0 moves, accept extra 16 moves within 0.32"
That means that if one move is better than all other at 0-ply by at
least 0.32, it will be played without further evaluations. If there are
other choices worse by less than 0.32, up to 16 of them will be
evaluated at a higher level.
The 1-ply filter is not enabled. That means all the up-to-16 moves above
will pass it and be evaluated further.
The 2-ply filter is enabled with "always accept 0 moves, accept extra 4
moves within 0.08" so the moves that have passed the earlier filters
will be evaluated at 2-ply, if one seems better by at least 0.08 it will
be played else up to 4 of them will be evaluated at 3-ply.
> Please let me know how to set up everything on sure, that will work to
> set the proggrams gameplay mode maximally difficult.
The most important factor for the program strength is the plies number
but as a sparring partner it doesn't make a big difference. O-ply
(expert) is already stronger on average than the best human players but
occasionally makes obvious errors. 2-ply and 3-ply (world class to
grandmaster) make less such errors but if you didn't know which setting
is in use you probably wouldn't be able to guess against which one you
were playing. 4-ply is probably too slow to play against but can be used
to analyse positions or matches.
The move filters are mostly a trick to have faster evaluations. When
there are many plausible candidate moves, like playing small doublets in
some cases, a larger filter may find a better move than a narrower one
but these cases will be rare. On the other hand, if the speed is still
fine with you, it doesn't hurt to do so.