Position 23a, page 81
From The Backgammon Book, by Oswald Jacoby and John R. Crawford

White to play 6-6.

Black has rolled 6-1 and made his bar point. This makes it impossible for you to move a 6 with one of your back men, so you cannot play double 6 or 6-5 the way you would if he had not made that bar point. Instead of being good rolls, they both become unsatisfactory.

Move four men from black twelve point to your bar point. This leaves a blot but is the best you can do.

13/7(4)  *
13/7(2), 8/2(2) x
Rollout 
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Centered cube
White rolls 6-6

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XGID=-b----E-C---dE---bbe----B-:0:0:1:66:0:0:0:0

6-6: Game BG   Equity
1 13/7(2), 8/2(2) W
L
.4661
.5339
.1562
.1593
.0111
.0084
−0.1118 x 
2 13/7(3), 8/2 W
L
.4606
.5394
.1463
.1661
.0089
.0092
−0.1534 (0.0416) 
3 13/7(4) W
L
.4544
.5456
.1403
.1380
.0072
.0070
−0.1667 (0.0549)  *

Previous Position
No. 22, page 79
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No. 23b, page 81

List of Positions from The Backgammon Book

The Backgammon Book (1970), by Oswald Jacoby and John R. Crawford

Backgammon Galore : Books