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Rating differences are important perhaps

Posted By: Ian Dunstan
Date: Saturday, 6 September 2008, at 9:01 a.m.

In Response To: 200+ rating points (Ian Dunstan)

Not much interest in this problem, perhaps it was too easy.

I have never been one to take the asymmetric MET's of Jacob and Trice particularly seriously even though I own the book and have studied it. In a race I will drop a borderline Take/Pass decision against a weaker player, but that is about it. Then this position came up and I sure didn't want to be taking an 8-cube here. I thought it was probably a technical Take, but I dropped this cube.

g11 states that it is a comfortable 0.9 Take, so I figured I was wrong to drop. However, I was curious enough to use J&C's Gnubg +100 table and see what the action was. It turned into a HUGE Pass, into double whopper territory after a short rollout.

Gnubg's rollout with the J&C +50 MET still has this a Pass.

The score is: White 2, Blue 4 (match to 21 points)

Move: White to play 31

White	80
Blue	76
Position ID: t3kHAECb8w5AAA Match ID: ApmlAiAAIAAA

• Blue accepts

Alert: wrong take ( -0.0652)! [doubtful]

Cube decision
Rollout cubeless equity		+0.4605	(Money: +0.4605)
Cubeful equities:
1.	Double, pass	+1.0000
2.	Double, take	+1.0652	+0.0652
3.	No double	+0.8081	-0.1919
Proper cube action:		Redouble, pass
Rollout details
Win W g W bg Lose L g L bg Cubeless Cubeful Player White owns 4-cube 72.88% 0.75% 0.01% - 27.12% 0.47% 0.00% +0.4605 +0.8081 Standard error 0.12% 0.04% 0.00% - 0.12% 0.05% 0.01% 0.0025 0.0042 Player Blue owns 8-cube 73.69% 0.65% 0.01% - 26.31% 0.39% 0.00% +1.1331 +1.0652 Standard error 0.22% 0.13% 0.01% - 0.22% 0.07% 0.01% 0.0086 0.0093
Full cubeful rollout with var.redn.
109 games, Mersenne Twister dice gen. with seed 837648578 and quasi-random dice
Stop when best play is enough JSDs ahead: limit 3.29 (min. 108 games)
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]
Different evaluations after 12 plies:
Play: 0-ply cubeful [expert]
Cube: 2-ply cubeful prune [world class]

Messages In This Thread

• 200+ rating points
  Ian Dunstan -- Friday, 5 September 2008, at 2:10 p.m.
  • 200+ rating points
    Petter Bengtsson -- Friday, 5 September 2008, at 3:35 p.m.
  • Rating differences are important perhaps
    Ian Dunstan -- Saturday, 6 September 2008, at 9:01 a.m.