Queen+Rook tactics

Some combinations and tactics with queen and rook and how these pieces can give winning possibilities.            For some other variants check "MOVE LIST"

At the first example white threatens Qxc7+ and Qb7 mate.Also white's bishop protects h1 square,but black finds his way.

At the second diagram white's rook will be soon take part at the attack..

3rd example:Same material but the fact that black rook is pinned gives white an advantage: