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-1.000 equity no matter what?

Posted By: leobueno
Date: Sunday, 3 July 2011, at 12:49 p.m.

This position is a variant of one Stick posted a while back (shown below).

Note that GNUbg says the three candidates are equally bad. Is this because we are going to get double/drop next play?

The score (after 0 games) is: gnubg 16, leo 7

Move number 3: leo to play 16

gnubg	103
leo	157
Position ID: NrsDgwCwz8EAQw Match ID: cIkYAAABOAAA

• leo moves bar/24 13/7*

Cube decision
4-ply cubeless equity		-0.745
	23.1 3.0 0.0 - 76.9 23.4 0.4
Cubeful equities:
	4-ply cubeful prune
1.	No double	-0.971
2.	Double, pass	+1.000	+1.971
3.	Double, take	-2.002	-1.031
Proper cube action:		No double, take (34.3%)

#		Ply	Move	Equity
•	1	R	bar/24 13/7*	-1.000
			28.6 5.2 0.1 - 71.4 31.4 1.4 -0.704 -1.000 0.0 0.0 0.0 - 0.0 0.0 0.0 0.000 0.000
			Full cubeful rollout with var.redn.
			3600 games, Mersenne Twister dice gen. with seed 925775484 and quasi-random dice
			Stop when best play is enough JSDs ahead: limit 4 (min. 360 games)
			Play: 4-ply cubeful prune
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			keep the first 0 2-ply moves and up to 4 more moves within equity 0.08
			Skip pruning for 3-ply moves.
			Cube: 4-ply cubeful prune
	2	R	bar/24 8/2	-1.000 ( +0.000)
			21.7 2.8 0.0 - 78.3 19.8 0.3 -0.739 -1.000 0.0 0.0 0.0 - 0.0 0.0 0.0 0.000 0.000
			Full cubeful rollout with var.redn.
			3600 games, Mersenne Twister dice gen. with seed 925775484 and quasi-random dice
			Stop when best play is enough JSDs ahead: limit 4 (min. 360 games)
			Play: 4-ply cubeful prune
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			keep the first 0 2-ply moves and up to 4 more moves within equity 0.08
			Skip pruning for 3-ply moves.
			Cube: 4-ply cubeful prune
	3	R	bar/24 21/15	-1.000 ( +0.000)
			19.3 3.2 0.1 - 80.7 43.8 1.3 -1.032 -1.000 0.0 0.0 0.0 - 0.0 0.0 0.0 0.000 0.000
			Full cubeful rollout with var.redn.
			3600 games, Mersenne Twister dice gen. with seed 925775484 and quasi-random dice
			Stop when best play is enough JSDs ahead: limit 4 (min. 360 games)
			Play: 4-ply cubeful prune
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			keep the first 0 2-ply moves and up to 4 more moves within equity 0.08
			Skip pruning for 3-ply moves.
			Cube: 4-ply cubeful prune

The score (after 0 games) is: gnubg 16, leo 7

Move number 3: leo to play 16

gnubg	140
leo	157
Position ID: xjbwjACwz8EAQw Match ID: cIkYAAABOAAA

• leo moves bar/24 13/7*

Cube decision
4-ply cubeless equity		-0.256
	38.3 9.3 0.2 - 61.7 11.5 0.3
Cubeful equities:
	4-ply cubeful prune
1.	No double	-0.377
2.	Double, pass	+1.000	+1.377
3.	Double, take	-0.945	-0.568
Proper cube action:		No double, beaver (29.2%)

#		Ply	Move	Equity
•	1	R	bar/24 13/7*	-0.494
			37.3 11.1 0.4 - 62.7 16.3 0.8 -0.310 -0.494 0.2 0.2 0.0 - 0.2 0.2 0.1 0.005 0.017
			Full cubeful rollout with var.redn.
			777 games, Mersenne Twister dice gen. with seed 885366813 and quasi-random dice
			Play: 3-ply cubeful prune [grandmaster]
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			keep the first 0 2-ply moves and up to 4 more moves within equity 0.08
			Cube: 3-ply cubeful prune [grandmaster]
	2	R	bar/24 8/2	-0.506 ( -0.012)
			36.0 8.8 0.2 - 64.0 11.5 0.5 -0.311 -0.506 0.1 0.2 0.0 - 0.1 0.2 0.0 0.003 0.010
			Full cubeful rollout with var.redn.
			777 games, Mersenne Twister dice gen. with seed 885366813 and quasi-random dice
			Play: 3-ply cubeful prune [grandmaster]
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			keep the first 0 2-ply moves and up to 4 more moves within equity 0.08
			Cube: 3-ply cubeful prune [grandmaster]
	3	2	bar/24 21/15	-0.626 ( -0.132)
			35.3 9.3 0.3 - 64.7 22.3 1.2
			2-ply cubeful prune [world class]

Messages In This Thread

• -1.000 equity no matter what?
  leobueno -- Sunday, 3 July 2011, at 12:49 p.m.
  • -1.000 equity no matter what?
    Christian Plenz -- Sunday, 3 July 2011, at 4:23 p.m.