This is a fascinating old problem. A mere glance at the below position is sufficient to detect that something is wrong with the position. Oh yes… THE WHITE KING IS MISSING.
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| WHERE IS THE WHITE KING? |
But invisible to us, the white king is somewhere there on the chess board. The challenge is to locate the square. Not only that, you also have to find the final sequence of moves that led to this position.
Looks impossible !!! So let's do some logical thinking.