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A tricky one or ... Rollout

Posted By: pierrez
Date: Monday, 25 August 2025, at 2:50 p.m.

In Response To: A tricky one or ... (Bob Koca)

All respondents selected 13/7 8/4 but





White is Joueur 2

score: 0
pip: 92
Unlimited Game
Jacoby Beaver
pip: 111
score: 0

Blue is Joueur 1
XGID=-BB-ACB-A---bB--bb-bBcaba-:0:0:1:64:0:0:3:0:10
Blue to play 64

1.Rollout113/7 8/4eq: -0,544
Player:
Opponent:
34,03% (G:3,66% B:0,11%)
65,97% (G:3,16% B:0,05%)
Conf.: ± 0,008 (-0,552...-0,536) - [53,6%]
Duration: 9 minutes 51 seconds
2.Rollout120/14 8/4eq: -0,545 (-0,001)
Player:
Opponent:
33,47% (G:4,43% B:0,09%)
66,53% (G:5,92% B:0,06%)
Conf.: ± 0,008 (-0,553...-0,537) - [45,1%]
Duration: 8 minutes 57 seconds
3.Rollout120/10eq: -0,556 (-0,011)
Player:
Opponent:
32,97% (G:5,22% B:0,10%)
67,03% (G:7,83% B:0,14%)
Conf.: ± 0,010 (-0,565...-0,546) - [1,2%]
Duration: 6 minutes 55 seconds
4.Rollout113/3eq: -0,578 (-0,034)
Player:
Opponent:
32,92% (G:5,93% B:0,28%)
67,08% (G:5,63% B:0,27%)
Conf.: ± 0,008 (-0,586...-0,570) - [0,0%]
Duration: 7 minutes 39 seconds
5.4-ply13/9 13/7eq: -0,567 (-0,023)
Player:
Opponent:
31,66% (G:2,01% B:0,02%)
68,34% (G:2,85% B:0,23%)
1 1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.19.211.pre-release

XG put on an equal step 20/14 8/4 despite Blue is down in the race. So what is the hidden asset of this play ?

Improving Blue board with the 4 is clear. And because of this liability (2 blots) in the White homeboard, then one can assume that the battle will revolve on leaving the respective 13 point. So as long as Blue maintain his own 13 point, White, barring perfect rolls, will bury her checkers deep in her homeboard. Hence increasing her wastage and EPC compared to Blue's EPC.

The trade is : with 13/7 8/4, the remaining blot on the 13 point is safe for one turn, then Blue as to rely on an indirect shot from his anchor when with 20/14 8/4, Blue will keep the 13 point longer and threaten a direct shot.

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