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BGonline.org Forums
interesting
Posted By: Daniel Murphy In Response To: interesting (Misja)
Date: Friday, 29 June 2007, at 3:29 a.m.
Are the gammon, backammon etc. percentages shown in the rollout result cubeless?
Sort of. Not really. Stick's rollout (http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=7378) was cubeful, so the cube is getting turned, and the "cubeless" numbers are not truly cubeless. If you run a cubeless rollout, you get different game breakdowns and different "cubeless" equities.
Here's a cubeless rollout with the same seed and parameters as Stick's cubeful rollout, obtaining different cubeless equities, and more games won, fewer gammons won and fewer gammons lost, with either play, 8/2 6/2 or 13/9 13/7.
The differences are not due to the difference in number of trials (meaining, if you extend this rollout, you won't get Stick's rollout's numbers).
The score (after 0 games) is: White 0, Me7 10 (match to 15 points)
Move number 3: Me7 to play 46
White 147
Me7 121 Position ID: 4HM2A0CDr4MxAA Match ID: cAn6AQAAUAAA
• Me7 moves 8/2 6/2
Cube decision 2-ply cubeless equity +0.5972 (Money: +0.5971) 0.7038 0.2392 0.0020 - 0.2962 0.0510 0.0007 Cubeful equities: 1. No double +0.6764 2. Double, pass +1.0000 +0.3236 3. Double, take +0.6400 -0.0364 Proper cube action: No double, take (10.1%)
Alert: doubtful move ( +0.000)
# Ply Move Equity • 1 R 8/2 6/2 +0.6337
0.7078 0.2711 0.0036 - 0.2922 0.0533 0.0029 +0.6337 0.0022 0.0038 0.0005 - 0.0022 0.0017 0.0005 0.0052 Full cubeless rollout (trunc. at exact bearoff) with var.redn. 987 games, Mersenne Twister dice gen. with seed 1062582678 and quasi-random dice Play: 2-ply cubeless prune keep the first 0 0-ply moves and up to 8 more moves within equity 0.16 Skip pruning for 1-ply moves. Cube: 2-ply cubeful prune 2 R 13/9 13/7 +0.5818 ( -0.0519)
0.7143 0.1962 0.0026 - 0.2857 0.0437 0.0021 +0.5818 0.0020 0.0031 0.0004 - 0.0020 0.0016 0.0004 0.0046 Full cubeless rollout (trunc. at exact bearoff) with var.redn. 986 games, Mersenne Twister dice gen. with seed 1062582678 and quasi-random dice Play: 2-ply cubeless prune keep the first 0 0-ply moves and up to 8 more moves within equity 0.16 Skip pruning for 1-ply moves. Cube: 2-ply cubeful prune
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