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Rollout

Posted By: Timothy Chow
Date: Friday, 8 January 2010, at 11:28 p.m.

In Response To: Money-game prime versus prime (Timothy Chow)

GNU clearly favors blasting away with the double hit. The blot at the rear of White's prime is a crucial factor. Lift the blot and GNU radically reverses its preference, at least on 4-ply evaluation.

This position is actually a variant of a position that came up over the board. In the real position, the blot was not there. I considered the double hit for a long time but eventually settled (correctly, it seems) on 13/5. I came up with this variant while trying to figure out what changes might have made the double hit correct.

gnubg	140
tchow	132
Position ID: sN0tACLMboMBBg Match ID: UYkOAAAAAAAA

#		Ply	Move	Equity
•	1	R	7/4* 6/1*	+0.320
			0.497 0.238 0.010 - 0.503 0.129 0.005 +0.108 +0.320 0.002 0.002 0.000 - 0.002 0.002 0.000 0.005 0.009
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 846113603 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	13/5	+0.262 ( -0.059)
			0.506 0.151 0.004 - 0.494 0.085 0.002 +0.079 +0.262 0.002 0.002 0.001 - 0.002 0.002 0.001 0.004 0.007
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 846113603 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]

Messages In This Thread

• Money-game prime versus prime
  Timothy Chow -- Thursday, 7 January 2010, at 11:05 p.m.
  • Money-game prime versus prime
    MandM1951 -- Thursday, 7 January 2010, at 11:21 p.m.
  • Money-game prime versus prime
    Adam Versaw -- Friday, 8 January 2010, at 11:29 a.m.
  • Money-game prime versus prime
    neilkaz -- Friday, 8 January 2010, at 5:19 p.m.
  • Money-game prime versus prime
    Chuck Bower -- Friday, 8 January 2010, at 6:19 p.m.
  • Rollout
    Timothy Chow -- Friday, 8 January 2010, at 11:28 p.m.