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BGonline.org Forums
501 Essential Backgammon Problems #33
Posted By: Igor In Response To: 501 Essential Backgammon Problems #33 (Igor)
Date: Thursday, 22 August 2013, at 2:19 p.m.
The 3 is clear, for the 5 Robertie's choice is a thematic ace point hit "to break the connection between the opponent's back men." I always thought that the purpose of that hit is twofold:
It turns out that in this position unstacking the midpoint and reinforcing the stripped 8pt is a better plan.
- Deprive the opponent from good sixes
- Protect the split
White is Player 2
score: 0
pip: 159Unlimited Game
Jacobypip: 159
score: 0
Blue is Player 1XGID=-a-B--DaB---dEa--c-e----B-:0:0:1:53:0:0:1:0:10 Blue to play 53
1. Rollout1 24/21 13/8 eq: +0.078
Player:
Opponent:51.26% (G:14.84% B:0.54%)
48.74% (G:10.98% B:0.44%)Conf.: ± 0.005 (+0.073...+0.083) - [100.0%]
Duration: 1 hour 04 minutes2. Rollout1 24/21 6/1* eq: +0.049 (-0.029)
Player:
Opponent:50.16% (G:17.31% B:0.56%)
49.84% (G:12.35% B:0.61%)Conf.: ± 0.006 (+0.043...+0.055) - [0.0%]
Duration: 1 hour 06 minutes1 10368 Games rolled with Variance Reduction.
Dice Seed: 25949992
Moves: 3-ply, cube decisions: XG RollereXtreme Gammon Version: 2.10
So I thought to myself: let's give blue more incentive to protect the split by moving white spare from her 11pt to her 10pt.
White is Player 2
score: 0
pip: 158Unlimited Game
Jacobypip: 159
score: 0
Blue is Player 1XGID=-a-B--DaB---dE-a-c-e----B-:0:0:1:53:0:0:1:0:10 Blue to play 53
1. Rollout1 24/21 13/8 eq: +0.038
Player:
Opponent:50.21% (G:15.41% B:0.60%)
49.79% (G:12.16% B:0.51%)Conf.: ± 0.007 (+0.031...+0.045) - [100.0%]
Duration: 31 minutes 25 seconds2. Rollout1 24/21 6/1* eq: +0.009 (-0.029)
Player:
Opponent:49.19% (G:16.77% B:0.58%)
50.81% (G:12.90% B:0.65%)Conf.: ± 0.008 (+0.001...+0.017) - [0.0%]
Duration: 34 minutes 22 seconds1 5184 Games rolled with Variance Reduction.
Dice Seed: 69445117
Moves: 3-ply, cube decisions: XG RollereXtreme Gammon Version: 2.10
Nope, hitting on the ace didn't go up in value. I guess duplication of sixes could be a factor.
P.S. Mile, don't bother cherry picking some of these positions as candidates for your database. I'll later collect, nactate, and send them your way.
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