Sashimi X-Wing
Use extra candidates to complete an X-Wing with missing intersections and find eliminations valid whether those candidates are true or false.
All candidates have been entered in the empty cells.
In the 2 columns in A, candidate digit 6 can appear only in the overlaps with the 2 rows in B or at candidate digit 6 marked C. If candidate digit 6 marked C is true, candidate digit 6 marked × that shares its row, column, or block is false. If candidate digit 6 marked C is false, candidate digit 6 in the 2 columns in A is confined to the overlaps with the 2 rows in B. In that case, one candidate digit 6 is true in each column in A. Because two 6s cannot share the same row in B, one candidate digit 6 is also true in each row in B. In this case too, candidate digit 6 marked × in the 2 rows in B is false. In either case, candidate digit 6 marked × can be removed.