Siamese Finned Franken Swordfish
Uses equal-sized groups of rows, columns, or boxes where one digit appears only across the other group.
All candidates have been entered in the empty cells.
Any true candidate 2 in A conflicts with 2 in cell C. The case with no true candidate in A is proved below.
Any true candidate 2 in B conflicts with 2 in 2 cells in D. The case with no true candidate in B is proved below. Remove candidate 2 marked × in cell C and 2 cells in D.