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fileDistance = abs (file2 - file1);
</pre>
<span id="TwoSquares"></span>
=Two Squares on a File=
Two [[Squares]] are on the same File, if their file distance is zero. The masking of the file bits can be done after the subtraction.
}
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* [[Ranks#TwoSquares|Two Squares on a Rank]]
* [[Diagonals#TwoSquares|Two Squares on a Diagonal]]
* [[Anti-Diagonals#TwoSquares|Two Squares on a Anti-Diagonal]]
=Pawns and Files=
* [[Half-open File]]
