Discovered check2
Both of these moves are equally good.
Diagram 1 shows the position at the end of the last page.
In diagram 2 the bishop has moved to b5 but in diagram 3 it has moved to g6. In both
diagrams the black king is in check. When black moves out of check the white bishop will take his queen.
Diagram 2 Bb5+ Diagram 3 Bg6+
