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RO

Posted By: Chuck Bower
Date: Tuesday, 11 November 2008, at 8:46 p.m.

In Response To: Dusting off another old position (Chuck Bower)

Deyong got this one right (an exception). And Gnu-bg 2-ply and 3-ply evals got it wrong. (4-ply got it right, but barely -- saying D is right by 0.014.)

The score (after 0 games) is: White 0, Blue 0

Move number 3: White on roll, cube decision?


2O '3X4X1O2X2X1X ' '1O2O

' ' '2O2O2O1O2O ' ' '3X

Pip counts: White 98, Blue 161
Position ID: 2NZggTDcswUHAA Match ID: MAEAAAAAAAAA

• White doubles

Alert: wrong double ( -0.0933)!

Cube decision
Rollout cubeless equity +0.3941
Cubeful equities:
1.No double +0.5281
2.Double, pass +1.0000 +0.4719
3.Double, take +0.4347 -0.0933
Proper cube action:No double, take (16.5%)
Rollout details
WinW gW bg LoseL gL bgCubelessCubeful
Centered 1-cube0.59080.25180.0281-0.40920.06480.0027 +0.3941 +0.5281
Standard error0.00120.00120.0005-0.00120.00080.0002 0.0028 0.0075
Player Blue owns 2-cube0.58480.26870.0339-0.41520.06660.0029 +0.8054 +0.4347
Standard error0.00140.00120.0007-0.00140.00080.0002 0.0068 0.0106
Full cubeful rollout with var.redn.
3746 games, Mersenne Twister dice gen. with seed 809263105 and quasi-random dice
Play: world class 2-ply cubeful prune [world class]
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 [world class]

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