Sudoku Tutorial | ||

Finned Fish (Finned X wing) |
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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: - If the blue fin is a 1, this would eliminate the slashed 1's in box 2.
- If the blue fin is not a 1, we would have a nice X wing which would also eliminate the slashed 1's.
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) |

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