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Rollout: Go for the gammon?

Posted By: Timothy Chow
Date: Sunday, 18 July 2010, at 1:18 a.m.

In Response To: Go for the gammon? (Timothy Chow)

The rollout indicates that ripping one off is correct here. For comparison I have also rolled out the variant position where Blue's stack of three checkers is on the 6 point rather than the 5 point and the roll is 5-3. Then 6/3 rolls out very slightly better than 3/off.

---

gnubg	72
tchow	34
Position ID: 33cAADC+cwAAAA Match ID: QQkOAEAAMAAA

#		Ply	Move	Equity
•	1	R	3/off	+1.188
			0.967 0.260 0.005 - 0.033 0.000 0.000 +1.199 +1.188 0.000 0.000 0.000 - 0.000 0.000 0.000 0.001 0.001
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 890549765 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	5/2	+1.153 ( -0.035)
			0.972 0.215 0.004 - 0.028 0.000 0.000 +1.163 +1.153 0.000 0.000 0.000 - 0.000 0.000 0.000 0.000 0.001
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 890549765 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]

---

Variant position:

gnubg	72
tchow	37
Position ID: 33cAADC+4wAAAA Match ID: QYkVAEAAMAAA

#		Ply	Move	Equity
	1	R	6/3	+1.109
			0.964 0.190 0.003 - 0.036 0.000 0.000 +1.121 +1.109 0.000 0.001 0.000 - 0.000 0.000 0.000 0.001 0.001
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 896190332 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]
	2	R	3/off	+1.102 ( -0.007)
			0.955 0.204 0.004 - 0.045 0.000 0.000 +1.117 +1.102 0.000 0.001 0.000 - 0.000 0.000 0.000 0.001 0.001
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 896190332 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]

Messages In This Thread

• Go for the gammon?
  Timothy Chow -- Friday, 16 July 2010, at 10:15 p.m.
  • Go for the gammon?
    John O'Hagan -- Saturday, 17 July 2010, at 1:21 a.m.
  • Go for the gammon?
    Christian Munk-Christensen -- Saturday, 17 July 2010, at 8:06 a.m.
  • Go for the gammon?
    johnk -- Saturday, 17 July 2010, at 3:32 p.m.
  • Rollout: Go for the gammon?
    Timothy Chow -- Sunday, 18 July 2010, at 1:18 a.m.