Retrograde Analysis Problem 8

  Difficulty: Intermediate   Keywords: Problem
[Diagram]
 

On a 5x5 board, after five moves (no one of them a pass), how many positions exist where you can determine exactly what the last move (B5) was? (Not knowing the order of moves, of course, but only seeing the position.)
/Attempts


Retrograde Analysis Problem 8 last edited by Dieter on November 18, 2008 - 16:39
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