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WTF?!

Posted By: Chuck Bower
Date: Monday, 2 November 2009, at 6:16 p.m.

In Response To: WTF?! (neilkaz)

I may have oversimplified.

Hopefully this attempt at clarification is correct:

If Blue holds the 2-cube for one roll, it goes Blue-roll+checkerplay, White-roll+checkerplay, Blue with a new cube decision. Most of the time(?) Blue now doubles and White passes. That branch of the rollout (for this trial) ends there and the cubeless breakdown is evaluated (i.e., by evaluation functions).

If Blue doubles and White takes (that's the lower half of the output's cubeless breakdowns), then the game continues until the game ends with either a cube cash or one player bears off all 15 checkers (and the latter can include truncation at bearoff database, which is, of course, extremely accurate).

Thus the cubeless breakdown tends to be (and maybe always is) better for the "White owns cube at 4" part than the "Blue owns cube at 2" part. Yet for some reason the output algorithm chooses to calculate "cubeless-$ equity" from the weaker data which is often highly dependent on a very quick evaluation.

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