Re: [gnugo-devel] Level and time_left

[david doshay]

On Saturday, February 7, 2004, at 10:03  AM, Evan Berggren Daniel wrote:

> Be aware that levels above 10 are "unsupported."  What this means is 
> that
> there is no particular guarantee that GNU Go will do what you want it 
> to,
> though it is likely that it will play better at higher levels.

From small runs of 8 or 10 game each, GG black playing against clusterGG
with global lookahead playing at level 10, we would agree:

1.1.1)  Log:    jan_29_01.log

                BLACK_HANDICAP  = 2
                BLACK_LEVEL     = 10

        Results:
                Game 1: W+37.5
                Game 2: W+62.5
                Game 3: W+12.5
                Game 4: W+10.5
                Game 5: B+11.5
                Game 6: W+4.5
                Game 7: W+44.5
                Game 8: W+14.5


1.1.2)  Log:    jan_30_01.log

	Note:	Only change compared with test 1.1.1 is increase the BLACK_LEVEL 
to 15.

                BLACK_HANDICAP  = 2
                BLACK_LEVEL     = 15

        Results:
                Game 1: B+51.5
                Game 2: W+15.5
                Game 3: W+10.5
                Game 4: B+1.5
                Game 5: W+26.5
                Game 6: W+18.5
                Game 7: W+22.5
                Game 8: B+56.5

We have done many runs and these results are typical.

> In testing, I have had games (at level 18) where GNU Go spent many 
> hours
> per move.  This is a problem when playing on servers, because (I 
> believe)
> GNU Go currently only changes level settings between moves, so if
> something of the sort happened it could lose on time.
>
> All that said, I would be surprised if there was a problem setting the 
> max
> level to something a little conservative, like 12.

Here are some times. All times are cumulative for an 8 game set running 
on
a 1.25GHz dual G4 tower:

BLACK_LEVEL     = 10
NUM_GAMES       = 8

max black time: 23 sec
total black time: 3554 sec = 0 hr : 59 min : 14 sec

max black time: 22 sec
total black time: 2979 sec = 0 hr : 49 min : 39 sec

max black time: 21 sec
total black time: 2999 sec = 0 hr : 49 min : 59 sec

Max black time: 38 sec
Total black time: 2936 sec = 0 hr : 48 min : 56 sec

Max black time: 17 sec
Total black time: 3180 sec = 0 hr : 53 min : 0 sec

Max black time: 35 sec
Total black time: 3209 sec = 0 hr : 53 min : 29 sec

Max black time: 22 sec
Total black time: 2924 sec = 0 hr : 48 min : 44 sec

Max black time: 31 sec
Total black time: 2748 sec = 0 hr : 45 min : 48 sec

Max black time: 27 sec
Total black time: 2691 sec = 0 hr : 44 min : 51 sec

Average time per game = 6 min 20 sec

BLACK_LEVEL     = 15
NUM_GAMES       = 8

max black time: 224 sec
total black time: 14080 sec = 3 hr : 54 min : 40 sec

So, with much smaller statistics for level 15 we have an
average near 30 minutes a game, or about 4.75 times
as long.

Cheers,
David