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Chess sudoku variants...By: Staceym [6-July-12 4:57PM]
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Amongst the many types of sudoku variants out there on the market, there are a range of puzzles that have chess type rules whereby certain positions or relationships are banned.
One of the most common of these, for instance, and a good example of how these puzzles work, is called anti-knight chess.
In this particular variant, a number cannot occur in the usual suspects: a row, column or 3x3 box, but additionally a number cannot occur in a position where it is a knights move away.
Thus in an anti-knight sudoku an 8 could not be placed two cells horizontally and one cell vertically away from another 8.
There are also other ones such as anti-king whereby a number cannot be diagonally adjacent to itself (clearly the standard rules forbid horizontal adjacency as then it would repeat in the same row or column).
Of course there are a range of other restrictions that can be put in place.
When it comes to solving them the difficulty is simply remembering the rule for the puzzle and then actually implementing it!
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