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Rollout: Weird endgame cube

Posted By: Timothy Chow
Date: Saturday, 11 September 2010, at 1:44 a.m.

In Response To: Weird endgame cube (Timothy Chow)

Blue has good gammon chances here, especially if he can pick and pass. The trouble is that with White's strong board, he just has to be hit back once and it's all over. Scrambling both checkers home safely is far from a done deal. Apparently there's just enough market loss to justify a double, but the take is trivial.

gnubg	115
tchow	49
Position ID: bdsBAEXfjxEIAA Match ID: UgkAAAAAKAAA

Cube decision
Rollout cubeless equity		+0.367
Cubeful equities:
1.	Double, take	+0.578
2.	Double, pass	+1.000	+0.422
3.	No double	+0.546	-0.032
Proper cube action:		Redouble, take
Rollout details
Win W g W bg Lose L g L bg Cubeless Cubeful Player tchow owns 4-cube 0.592 0.224 0.001 - 0.408 0.041 0.001 +0.367 +0.546 Standard error 0.001 0.001 0.000 - 0.001 0.001 0.000 0.002 0.003 Player gnubg owns 8-cube 0.604 0.228 0.001 - 0.396 0.047 0.001 +0.777 +0.578 Standard error 0.001 0.001 0.000 - 0.001 0.001 0.000 0.003 0.005
Full cubeful rollout with var.redn.
2592 games, Mersenne Twister dice gen. with seed 899723086 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

• Weird endgame cube
  Timothy Chow -- Friday, 10 September 2010, at 1:17 a.m.
  • Weird endgame cube
    johnk -- Friday, 10 September 2010, at 2:58 p.m.
  • Rollout: Weird endgame cube
    Timothy Chow -- Saturday, 11 September 2010, at 1:44 a.m.
    • Rollout: Weird endgame cube
      Stick -- Saturday, 11 September 2010, at 2:14 a.m.
      • Rollout: Weird endgame cube
        Timothy Chow -- Saturday, 11 September 2010, at 2:24 a.m.