I was just dabbling with an idea for the Chessdoku and thought why not add the even odd constraint, which will help reduce the number of givens drastically. Here is the result.
Fill the Grid such that the digits 1 - 6, King(K) Queen(Q) and Knight(N) occur once in every row, column and 3x3 box. Grey cells can contain only the even digits, yellow cells can contain only odd digits.
A Chess King cannot attack another King, a Knight cannot attack another Knight and a Queen cannot attack another Queen.
Fill the Grid such that the digits 1 - 6, King(K) Queen(Q) and Knight(N) occur once in every row, column and 3x3 box. Grey cells can contain only the even digits, yellow cells can contain only odd digits.
A Chess King cannot attack another King, a Knight cannot attack another Knight and a Queen cannot attack another Queen.
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