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Another rollout of an old position

Posted By: Timothy Chow
Date: Monday, 9 November 2009, at 9:55 p.m.

Here is the position from the Stick/MCG doubles training match that caused the most "violent disagreement". Again, if the rollout has already been posted, I missed it.

According to GNU, the pointing play slightly edges out the double hit. It took a pretty long rollout to establish this, though (2592 games wasn't enough). Either play will lead to a highly volatile position.

The score (after 3 games) is: gnubg 4, Stick/MCG 4 (match to 7 points)

gnubg	171
Stick/MCG	165
Position ID: 4G2MiCFsbmAALg Match ID: cAn3AEAAIAAA

#		Ply	Move	Equity
•	1	R	7/1* 6/1	-0.155
			0.444 0.225 0.010 - 0.556 0.163 0.014 -0.038 -0.155 0.001 0.001 0.000 - 0.001 0.001 0.001 0.003 0.008
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 869606356 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	13/8* 7/1*	-0.187 ( -0.032)
			0.443 0.220 0.012 - 0.557 0.175 0.019 -0.074 -0.187 0.001 0.002 0.001 - 0.001 0.002 0.001 0.004 0.011
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 869606356 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.