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Rollout: Offense, defense, or a bit of both?

Posted By: Timothy Chow
Date: Saturday, 28 August 2010, at 6:48 p.m.

In Response To: Offense, defense, or a bit of both? (Timothy Chow)

OTB I ran with 22/14(2), reasoning much as Chuck did. GNU 2-ply thought my play was a 0.044 error, preferring (as many responders did) 22/18(2) 13/9(2), but it seems to reverse its preference upon rollout (though maybe this rollout should be extended). It seems not uncommon for GNU to change its mind upon rollout with these kind of midgame doublets; I think I've posted one or two other examples here in the past.

gnubg	146
tchow	154
Position ID: 2M7BASiw5+ABDA Match ID: cAkSAHABYAAA

• tchow moves 22/14(2)

#		Ply	Move	Equity
•	1	R	22/14(2)	+0.453
			0.620 0.082 0.003 - 0.380 0.061 0.002 +0.262 +0.453 0.001 0.002 0.000 - 0.001 0.001 0.000 0.003 0.007
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 894559817 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	22/18(2) 13/9(2)	+0.435 ( -0.019)
			0.609 0.147 0.005 - 0.391 0.088 0.003 +0.278 +0.435 0.001 0.002 0.000 - 0.001 0.001 0.000 0.004 0.009
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 894559817 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	22/18(2) 13/5	+0.392 ( -0.061)
			0.591 0.146 0.004 - 0.409 0.089 0.003 +0.240 +0.392 0.001 0.002 0.000 - 0.001 0.002 0.000 0.003 0.008
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 894559817 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]
	4	R	8/4(2) 6/2*(2)	+0.365 ( -0.088)
			0.571 0.237 0.008 - 0.429 0.114 0.005 +0.269 +0.365 0.002 0.002 0.000 - 0.002 0.001 0.000 0.004 0.011
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 894559817 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]
	5	R	22/18(2) 6/2*(2)	+0.318 ( -0.136)
			0.573 0.152 0.005 - 0.427 0.109 0.004 +0.190 +0.318 0.001 0.002 0.000 - 0.001 0.002 0.000 0.004 0.010
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 894559817 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

• Offense, defense, or a bit of both?
  Timothy Chow -- Friday, 27 August 2010, at 12:36 a.m.
  • Offense, defense, or a bit of both?
    Leonardo Jerkovic -- Friday, 27 August 2010, at 1:59 a.m.
  • Offense, defense, or a bit of both?
    Casper van der Tak -- Friday, 27 August 2010, at 1:59 a.m.
  • Offense, defense, or a bit of both?
    garyo -- Friday, 27 August 2010, at 5:59 a.m.
  • Offense, defense, or a bit of both?
    Chuck Bower -- Friday, 27 August 2010, at 6:45 p.m.
  • Rollout: Offense, defense, or a bit of both?
    Timothy Chow -- Saturday, 28 August 2010, at 6:48 p.m.
    • XG RO
      Petter Bengtsson -- Saturday, 28 August 2010, at 6:54 p.m.
      • XG RO
        Timothy Chow -- Sunday, 29 August 2010, at 2:14 a.m.