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Pablo's
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Problem
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Reference
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Chessprint
December 12, 2004
 
 
Although invisible, the White king is somewhere
on this chessboard. Where is he?
Find the
Solution
[Index of Chessprints]
Solution
The step-by-step solution:
-
Either Black is in check, or the White king stands on b3.
However on b3 the king would be in double check, and it is quite impossible
to create a sequence leading to that position. Hence, Black is in
check, and White made the last move.
-
The only way White could have checked Black is to have
discovered the check by moving a piece from either b3 or c2. Since the
only other piece on the board is the White king, it had to have been
standing on b3.
-
The only way the White king could have been exposed to
double check on b3 is by a black pawn on b4 capturing a White pawn en
passant on c3.
-
Since the king on b3 would still have been in check from the
d5-bishop, the White pawn must have been on c4. For en passant to have
occurred the pawn had to have just moved from c2-c4. Let's see, so far
we have reconstructed 1.c2-c4 b3xc3 2.Kb3-somewhere.
-
The black pawn which captured the White pawn en passant is
no longer on the board, so White must have captured it, hence the White king
must be on c3.
-
Going back a bit further, the sequence of moves would have
begun with a Black check involving the bishop: 1...Bd5+ 2.c4 bxc3+
3.Kxc3
[Index of Chessprints]
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