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The [] filter
The
[]
filter denotes the empty set of squares. It is equivalent to
~a-h1-8
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Examples
CQL By Example
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QQqq
lone knight mate
Greek gift
smothered mate
mirror mate
rook: 4 corners, 3 moves
queen staircase
interference theme
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Ding's theme
New in CQL 6.2
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puremate
, etc.
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