Tactics Practice - Pinning 3-4

Another day, a few more tactics puzzles to share.  For anyone reading, these come from an old book of puzzles I found.  Sharing these with the hope that they might help tactically beleaguered chess fans improve in their tactical play through thematic study.  Obviously, these are all about pinning.  That said, on with the puzzles:

For the next one, the focus of the attack is f7.