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How many combinations exists in a Solo Chess Game with two of any piece on the board using only their legal positions (pawns doesn't occupy first and eighth ranks)?
Note that in Solo Chess rules: - there may be one or more Queens (in this case two), as for any other piece except for the King, which can be one ore none; - one or both of the pieces are hanging, the goal is to clear the chess board leaving only one piece; - only the King can't be taken. Sorry, I didn't specified.
What goes up,but never goes down?
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