BGonline.org Forums

Rollout: Save a 6?

Posted By: Timothy Chow
Date: Sunday, 18 July 2010, at 12:52 a.m.

In Response To: Save a 6? (Timothy Chow)

Saving a 6 in this sort of position is usually worth it if you're far ahead enough in the race that you can afford to trash your board and bury checkers, since you're just trying to get past safely and are not expecting to hit a shot. Nominally my pipcount is lower here but I'm not really "ahead" because I have buried checkers and an anchor that's further back. Saving a 6 isn't worth it here, especially since I'd have to run on 6-4 anyway. Compare with the variant position below where saving a 6 is correct.

---

gnubg	75
tchow	71
Position ID: 27YFBgBv2wQwAA Match ID: cAkOAEAAKAAA

#		Ply	Move	Equity
•	1	R	7/3 5/2	-0.111
			0.455 0.001 0.000 - 0.545 0.025 0.001 -0.116 -0.111 0.001 0.000 0.000 - 0.001 0.001 0.000 0.001 0.003
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 890950775 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	7/4 5/1	-0.142 ( -0.031)
			0.447 0.001 0.000 - 0.553 0.028 0.001 -0.133 -0.142 0.001 0.000 0.000 - 0.001 0.001 0.000 0.001 0.003
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 890950775 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]
	3	R	5/2 5/1	-0.171 ( -0.059)
			0.435 0.002 0.000 - 0.565 0.013 0.000 -0.140 -0.171 0.001 0.000 0.000 - 0.001 0.000 0.000 0.002 0.003
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 890950775 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	81
tchow	65
Position ID: 27YFMABv2wQGAA Match ID: cAkOAEAAKAAA

#		Ply	Move	Equity
	1	R	5/2 5/1	+0.409
			0.635 0.002 0.000 - 0.365 0.012 0.000 +0.260 +0.409 0.001 0.000 0.000 - 0.001 0.001 0.000 0.002 0.004
			Full cubeful rollout with var.redn.
			468 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	7/3 5/2	+0.383 ( -0.026)
			0.623 0.019 0.000 - 0.377 0.031 0.000 +0.233 +0.383 0.001 0.001 0.000 - 0.001 0.002 0.000 0.003 0.006
			Full cubeful rollout with var.redn.
			468 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

• Save a 6?
  Timothy Chow -- Friday, 16 July 2010, at 10:12 p.m.
  • Rollout: Save a 6?
    Timothy Chow -- Sunday, 18 July 2010, at 12:52 a.m.
    • Rollout: Save a 6?
      Nack Ballard -- Sunday, 18 July 2010, at 1:02 a.m.