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August 31, 2009, Challenge, grid solution

by Yegor Bryukhov — last modified 2009-09-03 11:45

Goal: babAbABABab, can be solved in 20 moves



























Rules:
B
b


























aA
B
b
B
b
























Aa
B
b
A
a
B
b






















bB
B
b
A
a
b
a
b
a
B
b


















Bb
B
b
A
a
b
a
b
a
B
b
B
b
















aaa
B
b
A
a
b
a
b
a
B
b
B
A
a
b














bb
B
b
A
a
b
a
b
a
B
b
B
A
B
b
a
b












abab
B
b
A
a
b
a
b
a
B
b
B
A
B
A
A
A
b
a
b









AAA
B
b
A
a
b
a
b
a
B
b
B
A
B
A
A
A
b
a
b
B
b







BB
B
b
A
a
b
a
b
a
B
b
B
A
B
A
A
A
b
a
b
B
A
a
b





BABA
B
b
A
a
b
a
b
a
B
b
B
A
B
A
A
A
b
a
b
B
A
b
B
a
b




B
b
A
a
b
a
b
a
B
b
B
A
B
A
A
A
b
a
b
B
A
b
B
A
B
A
B
a
b

B
b
A
a
b
a
b
a
B
b
B
A
B
A
A
A
b
a
b
B
A
A
B
A
B
a
b


B
b
A
a
b
a
b
a
B
b
B
A
B
A
A
A
b
a
A
A
B
A
B
a
b




B
b
A
a
b
a
b
a
B
b
A
A
b
a
A
A
B
A
B
a
b








B
b
A
a
b
a
b
a
A
A
b
a
A
A
B
A
B
a
b










B
b
b
a
b
a
A
A
b
a
A
A
B
A
B
a
b












b
a
b
a
A
A
b
a
A
A
B
A
B
a
b














b
a
b
a
A
A
b
A
B
A
B
a
b
















b
a
b
A
b
A
B
A
B
a
b


















 

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