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'''[[Main Page|Home]] * [[Board Representation]] * [[Bitboards]] * [[Pawn Pattern and Properties]] * Pawns and Files'''
Based on [[Pawn|pawns]], [[Files|files]] are either '''closed''', [[Open fileFile|open]] or [[Half-open fileFile|half-open]]. [[Rook|Rooks]] prefer open files for [[Mobility]], to eventually enter the opponent side of the board. Rooks further prefer own half-open files to attack opponent pawns if they are weak, such as [[Backward Pawn|backward]] or [[Isolated Pawn|isolated]].
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<span id="HalfopenFiles"></span>
=Half-open Files=
The complements of white or black [[Pawn Fills#FileFill|filefills]] are either [[Half-open fileFile|half-open]] (for either color) or [[Open fileFile|open]].
<pre>
U64 halfOpenOrOpenFile(U64 gen) {return ~fileFill(gen);}
