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Retro-Puzzle

Posted By: Nack Ballard
Date: Friday, 27 January 2012, at 4:53 p.m.


1X1X2O ' '3X2X3X ' ' '3O

' ' ' '2O5O '3O '2X '3X


Michael Depreli posted the rollout for the above position here.

    How was this position reached?

Assume that both sides played "well," meaning that neither side made a checker or cube error exceeding .020, with XGR++ evaluation as the arbiter.

What was White's last play? What was Blue's play before that? The further you can go back, the better the solution. (In case you can retrace all the way to the opening position, the shortest sequence is best.)

Have fun.

Nack

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