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52D-41$-51S-52?

Posted By: Timothy Chow
Date: Sunday, 1 August 2010, at 3:05 a.m.

In Response To: RO at Gammon Go (6stones)

Interesting rollout..thanks!

In the position below, making the stronger point is enormously better, despite leaving a double direct shot instead of a double indirect shot. (The deck is somewhat stacked here since making the stronger point also creates a better distribution.)

One possible exception to the rule that a better point trumps better distribution may be when making the better point requires you to actually give up another point. For example suppose you have a 44 to play and, for two of the 4's, you have a choice between shifting your bar point to your 3 point and unstacking your 6 point to make your 2 point. Then I think it is often right to unstack.


Unlimited game: tchow to play 25

gnubg154


2O ' ' ' '5X '5X ' '1X4O

1X1X ' '1O4O '3O1O ' '2X

tchow162

Position ID: 4PORASjQc+EBMA Match ID: cAkVANAAQAAA

• tchow moves 9/4 6/4

# Ply Move Equity
1 R 9/4 6/4 +0.092
0.5220.1550.008-0.4780.1440.010 +0.054 +0.092
0.0020.0020.000-0.0020.0020.001 0.005 0.013
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 853983941 and quasi-random dice
Play: supremo 2-ply cubeful prune [world class]
keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
Skip pruning for 1-ply moves.
Cube: 2-ply cubeful prune [world class]
2 R 8/3 5/3 -0.054 ( -0.146)
0.4860.1450.007-0.5140.1540.009 -0.040 -0.054
0.0020.0020.000-0.0020.0020.000 0.004 0.012
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 853983941 and quasi-random dice
Play: supremo 2-ply cubeful prune [world class]
keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
Skip pruning for 1-ply moves.
Cube: 2-ply cubeful prune [world class]

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