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What was White's last move?

Posted By: Nack Ballard
Date: Thursday, 10 December 2015, at 1:28 a.m.

In Response To: People resistant to new ideas (Snua)





White is Player 2

score: 0
pip: 160
Unlimited Game
Jacoby Beaver
pip: 142
score: 0

Blue is Player 1
XGID=----cBCBBC--b-c--bBacA--a-:1:1:1:00:0:0:3:0:10

Blue is on roll.
What was White's last move?


Above is the position Snua posted in this thread (a re-cube decision).

Assume that both sides played perfectly, according to XGR++ evaluation. What was White's last move?

There is more than one possibility (though none easy to see). The best answer is the one that makes the previous position (or lead-up sequence) look the most game-like.


Neil said: One wonders how White's game was ever good enough to throw the cube.

The cube decision below is one way it might have happened:





White is Player 2

score: 0
pip: 155
Unlimited Game
Jacoby Beaver
pip: 173
score: 0

Blue is Player 1
XGID=----b-E-D---dCa--b-db--AAA:0:0:-1:00:0:0:3:0:10

White, on roll, should cube


For anyone that would like a tough challenge (or two):

(1) How can the above position be reached with perfect play from the opening position? (Any number of rolls is allowed. I believe the fewest is six.)

(2) How can you get from this position to Snua's position at the top of this post? (The sequence I found is nine rolls.)

Nack

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