Robertie Position 107

Compare this position with Position 158.

# Ply Move Equity
• 1 R 13/8 +1.062
 
0.7630.1080.003-0.2370.0320.001 +0.604 +1.062
0.0020.0020.000-0.0020.0010.000 0.004 0.011
  
  Full cubeful rollout with var.redn.  
  1296 games, Mersenne Twister dice gen. with seed 867639764 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 13/9 6/5 +0.988 ( -0.074)
 
0.7490.1120.004-0.2510.0390.001 +0.573 +0.988
0.0020.0020.000-0.0020.0010.000 0.004 0.010
  
  Full cubeful rollout with var.redn.  
  1296 games, Mersenne Twister dice gen. with seed 867639764 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 13/9 5/4 +0.942 ( -0.120)
 
0.7430.1290.004-0.2570.0490.001 +0.570 +0.942
0.0010.0020.000-0.0010.0010.000 0.003 0.008
  
  Full cubeful rollout with var.redn.  
  1296 games, Mersenne Twister dice gen. with seed 867639764 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]  


By the way, GNU Backgammon thinks that Black should have doubled before rolling the dice:

Cube decision
Rollout cubeless equity +0.577 
Cubeful equities:
1.Double, take +0.996 
2.Double, pass +1.000 +0.004
3.No double +0.985 -0.011
Proper cube action:Double, take
Rollout details
 WinW gW bg LoseL gL bgCubelessCubeful
Centered 1-cube0.7540.1060.003-0.2460.0380.001 +0.577 +0.985
Standard error0.0020.0020.000-0.0020.0010.000 0.004 0.010
Player gnubg owns 2-cube0.7510.1160.005-0.2490.0410.001 +1.163 +0.996
Standard error0.0020.0020.000-0.0020.0010.000 0.008 0.011
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 868056684 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]

 

But even with White owning the cube, GNU Backgammon prefers 13/8:

# Ply Move Equity
• 1 R 13/8 +0.539
 
0.7660.1080.004-0.2340.0320.000 +0.613 +0.539
0.0020.0020.000-0.0020.0010.000 0.004 0.006
  
  Full cubeful rollout with var.redn.  
  1296 games, Mersenne Twister dice gen. with seed 867420149 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 13/9 5/4 +0.511 ( -0.028)
 
0.7500.1370.005-0.2500.0440.001 +0.597 +0.511
0.0020.0020.000-0.0020.0010.000 0.004 0.005
  
  Full cubeful rollout with var.redn.  
  1296 games, Mersenne Twister dice gen. with seed 867420149 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 13/9 6/5 +0.488 ( -0.051)
 
0.7500.1070.003-0.2500.0380.000 +0.571 +0.488
0.0020.0020.001-0.0020.0010.000 0.004 0.005
  
  Full cubeful rollout with var.redn.  
  1296 games, Mersenne Twister dice gen. with seed 867420149 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]