Sue de Coq
Split the candidates filling a line-block intersection into two sets and eliminate their digits from outside the corresponding sets.
All candidates have been entered in the empty cells.
cell A use 1 digits from 3 and 6. block D allows at most 1 of 3 and 6 in the 2 cells in C. cell B use 1 digits from 4 and 7. row E allows at most 1 of 4 and 7 in the 2 cells in C. Filling all 2 cells in C requires every bound to be reached. Cells A and C use all of 3 and 6 in block D; cells B and C use all of 4 and 7 in row E. Remove the crossed-out 3, 6, 4 and 7.