  We calculate the image of the combinatorial R-matrix for any classical
highest weight element in the tensor product of Kirillov--Reshetikhin crystals
$B^{r,k}\otimes B^{1,l}$ of type $D^{(1)}_n, B^{(1)}_n, A^{(2)}_{2n-1}$. The
notion of $\pm$-diagrams is effectively used for the identification of
classical highest weight elements in $B^{1,l}\otimes B^{r,k}$.
