|Finned Fish (Finned X wing)
|This is almost an X wing.
If the blue cell did not
contain candidate 1, then an X wing would be present. The slashed
1's could be removed (as well as two other cells)..
Unfortunately this is not the case. The blue cell contains a 1. The blue cell is the fin and it spoils our X wing.
Consider just two possibilites:
Note: we cannot eliminate the 1's in r8c5 or the 1 in r3c3. That's because this isn't
an X wing. If this was a true X wing then those candidate could be eliminated. The fin
confines our possible eliminations to the box where the fin resides (box 2 in this case)