. . . | . . . | . . . . . . | . . . | . . . . . . | . . . | . . . ------+-------+------ . * . | . 6 . | . 6 . . . . | . . . | . . . . . 6 | . . . | . 6 . ------+-------+------ . . . | . . . | . . . . . . | . . . | . . . . . . | . . . | . . .
offline is correct -- this is not a fish fin for rows 46 since the *'d cell is in the set of rows; however it _is_ a fish fin for columns 358. It is not necessary that the unaffected cells be anything near a fish pattern - only that the after being touched by a cell outside the set of houses (in the example columns 3, 5 and 8), that there remains too many niches for the fewer candidates that are left.
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