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Techniques / Finned & Complex Fish

Franken and Mutant Fish

Unfair

Fish whose base or cover sets include boxes (Franken) or mix rows, columns and boxes (Mutant).

A normal fish uses rows as base lines and columns as cover lines (or the reverse). A Franken fish may use boxes among the base or the cover sets. A Mutant fish mixes rows, columns and boxes on both sides.

The rule stays the same: N base units and N cover units, every candidate of the digit in the base units lies in a cover unit, and the base units do not overlap. Then the digit must sit in exactly one cell of each base unit and therefore be used up by the cover units; all other candidates of the cover units can be removed. Fins and sashimi work as for ordinary fish. Mutant fish are very rare.

Notation

Franken X-Wing: 5 can be removed from r1c5, r1c6.

37491245892589625959284945659713165329742989537148626172525825893484293657153684912497491825672351358567218456459359134589569
Franken X-Wing: 5 can be removed from r1c5, r1c6.

pattern removed

Open in app
37491245892589625959284945659713165329742989537148626172525825893484293657153684912497491825672351358567218456459359134589569
Finned Franken X-Wing: 9 can be removed from r1c8.

pattern fin / link removed

Open in app
458926968292593712458124585817625439258459293718624524564917528328371862454592853491677692531489484681542928962897389368428972589125812568
Mutant X-Wing: 8 can be removed from r8c7, r9c5, r9c7, r9c8, r9c9.

pattern removed

Open in app