Diagram 1 shows the position at the end of the last page.
In diagram 2 black has played Re1+ but in diagram 3 he has played Rd5+
Diagram 2 Diagram 3
In both of these diagrams the white king is in check from the black bishop
and the black rook is attacking the white queen. When the king moves out
of check the black rook will capture the white queen.
