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Proof bots don't play perfectly

Posted By: Daniel Murphy
Date: Friday, 14 October 2011, at 9:24 p.m.

In Response To: Proof bots don't play perfectly (Steve Mellen)

The original position:

The score is: White 5, Blue 2 (match to 7 points)

Move number 3: Blue to play 51

White82

2X5X2X2X '2X ' ' ' ' ' '

5O3O2O ' '1X ' ' ' ' ' '
Blue17
Position ID: +zYDgEDfDQAAAA Match ID: cInmAFAAEAAE

In a 10,000 trial Gnubg 2-ply supremo rollout, the actual result for 51: 3/off 1/off was:

Blue wins99.41%
1-cube97.21%
Single45.34%
Gammon51.41%
Backgammon00.46%
2-cube02.20%
Single02.14%
Gammon00.06%
White wins00.59%
1-cube00.00%
2-cube00.59%

Obtained by rolling out White's No Double cube action after Blue's play. There were no taken 4-cubes.

Bottom line: the aggressive play gains 2.3% or so more gammons, and risks not 5.9% or so cubeless losses, but only about 0.6% cubeful losses.

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