Position 70, page 126
From Backgammon for Blood, by Bruce Becker

White to play 5-1.

The general rule would have you break from the 6 point, moving one man to your 1 point and one man to your 5 point. But this would leave you with three men on your 5 point. Now, if Black does not get in on his next throw, there are seventeen ways you can be in danger on your next roll by having to leave a blot.

However, suppose instead you were to break your 5 point. Assuming Black does not get in on his next throw, you can then be in trouble only in seven ways.

Thus you can see that a third man on your highest point, other than the 6 point, can be a danger and is to be avoided. And don’t forget that if you have three men on your 6 point, you better have three men on your 5 point too.

5/off, 5/4  Not: 6/1, 6/5
Rollout

Tom Keith 2013
Money play
Black owns 2-cube
White rolls 5-1

1296 games with VR
Checker play: 3-ply
Cube play: XG Roller
XGID=aCBBBBB---------b--bcbbc--:1:-1:1:51:0:0:0:0

 5-1: Game G BG Equity 1 5/4, 5/off W L .9446 .0554 .1088 .0000 .0007 .0000 +0.9726 2 6/5, 6/1 W L .8970 .1030 .0841 .0000 .0004 .0000 +0.8298 (0.1428) Not 3 5/off, 1/off W L .6630 .3370 .1382 .0000 .0012 .0000 +0.3020 (0.6706) 4 6/off W L .6644 .3356 .1190 .0000 .0009 .0000 +0.2900 (0.6826)

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List of Positions from Backgammon for Blood

Backgammon for Blood (1974), by Bruce Becker