You have a 4×5 chess board as follows:

You can move the four bishops in any order (not necessarily alternating black and white), provided that no move puts a piece in danger of being captured by a bishop of the opposite color.

What is the fewest number of moves needed for the black and white bishops to exchange places?

I find 8 moves is but needed.

(1) a4-d1
(2) e2-c4
(3) d1-e2
(4) e4-c2
(5) c2-a4
(6) a2-b1
(7) b1-a4
(8) c4-a2

Posted by Dej Mar on 2018-08-24 18:18:37