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interesting

Posted By: Daniel Murphy
Date: Friday, 29 June 2007, at 3:29 a.m.

In Response To: interesting (Misja)

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

White147


 ' ' ' ' '5X '3X2O2X2X2O

2O ' ' ' '5O1O3O ' ' '2X

Me7121

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
0.70780.27110.0036-0.29220.05330.0029 +0.6337
0.00220.00380.0005-0.00220.00170.0005 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)
0.71430.19620.0026-0.28570.04370.0021 +0.5818
0.00200.00310.0004-0.00200.00160.0004 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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