FIBS Board backgammon forum
Backgammon => Fibsboard Forum Matches => FFM 6 => Topic started by: diane on August 01, 2010, 02:36:30 AM
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(http://www.fibsboard.com/fibsboard-forum-match-6/game-1-move-9-r_monk-to-move-3-1/?action=dlattach;attach=4864;image)
9/6 3/2*
I think the only other option is 13/10 3/2* - hitting is necessary, hope I can keep you on the bar for a little while, so that I can break your prime by threatening the 3-point.
Think 9/6 will be better, I'm not sure about that. Keeping my blot on the outside seems safer to me.
This is mainly supposed to be a learning exercise, so I hope our guest won't mind a little second guessing.
Is the hit correct here? My winning plan as White would be to let the blue runner sit and watch blue's board crunch, so I wouldn't hit. As for what to play, I'd leave the checker on the midpoint so as to possibly hit an escapee and keep all my made points and that leaves 9/5 as the one remaining play. One caveat is that this is a timing thing and I still suck at the timing thing.
Hitting does have the advantage of taking away half a roll that could be used to cover the blot in blue's homeboard, so it might well be right, but I'll still stick with the 9/5 play. One thing is clear - if you're going to hit loose, use the 3 to bring a checker into range to cover the blot with 9/6. Playing the three off the midpoint has to be inferior.
Since White is not close to a recube (yet) I see no harm in doing a rollout. We'll see in about an hour.....stay tuned....
rollout
Spoiler
gnubg 0-ply likes the hit. There's a non-hitting play within the margin of error, but it's not the non-hitting play I suggested. I have no idea why 13/12 9/6 is better than 13/10 9/8 or why both are better than 9/5. Ideas anyone?
Good job finding the best play among several close ones.
1. Rollout 9/6 3/2* Eq.: -0.275
0.383 0.086 0.005 - 0.617 0.231 0.029 CL -0.457 CF -0.275
[0.002 0.002 0.001 - 0.002 0.003 0.002 CL 0.006 CF 0.009]
2. Rollout 13/12 9/6 Eq.: -0.282 ( -0.007)
0.385 0.064 0.007 - 0.615 0.230 0.034 CL -0.477 CF -0.282
[0.002 0.001 0.001 - 0.002 0.002 0.002 CL 0.006 CF 0.010]
3. Rollout 13/10 9/8 Eq.: -0.294 ( -0.019)
0.385 0.060 0.006 - 0.615 0.231 0.034 CL -0.479 CF -0.294
[0.002 0.001 0.001 - 0.002 0.003 0.002 CL 0.006 CF 0.010]
4. Rollout 13/10 3/2* Eq.: -0.314 ( -0.039)
0.372 0.081 0.007 - 0.628 0.232 0.032 CL -0.487 CF -0.314
[0.002 0.001 0.001 - 0.002 0.003 0.002 CL 0.007 CF 0.010]
5. Rollout 9/5 Eq.: -0.331 ( -0.056)
0.370 0.062 0.006 - 0.630 0.232 0.033 CL -0.517 CF -0.331
[0.002 0.001 0.002 - 0.002 0.002 0.002 CL 0.006 CF 0.010]
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed 896490702 and quasi-random dice
Play: 0-ply cubeful prune [expert]
Cube: 0-ply cubeful prune [expert]