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High QF problem and XG question

Posted By: Maik Stiebler
Date: Monday, 29 November 2010, at 2:59 p.m.

	is Player 2 score: 2 pip: 70 5 point match pip: 83 score: 1 is Player 1
XGID=-BBBBCB-----a---A--eAdbba-:1:1:-1:42:1:2:0:5:10
to play 42

eXtreme Gammon Version: 1.20

You are Black and have to play 42. Your opponent has demonstrated that he doesn't know how to double aggressively at this score. In fact, you are 100% sure that he doesn't double after 13/7 with or without hitting.

What do you do?

And the question to Xavier is: The opponent I described could be XG-1-ply. But why is XG-3-ply analysis in this case so significantly different from 1-ply/1-ply rollouts (truncated or full)? Does XG use higher ply cube action in the look-ahead in 3-ply analysis so that it finds the double after Black's 42?