Chess Problem Corner

Problem 1

PIN w to play

{[#]} 5. Nxe5 Bxd1 6. Bb5+ *

Problem 2

PIN 11 w to play

{[#]} 1. Nxd7 Rxd7 2. Bxd5 Rxd5 3. b6 

Problem 3

PIN 12 w to play

{[#]} 1. Bxc6 bxc6 2. Ne5 *

Problem 4

PIN 13 w to play

{[#]} 1. Rxd5 exd5 2. e6 *

Problem 5

Potent Pawns w to play first move is not check

{[#]} 1. Bg3 Qxg3 (1… Qf3 2. exf3#) (1… Qe3 2. fxe3#) (1… Qd3 2. exd3#) (1… Qb8 2. f4#) (1… Bxg4 2. f3#) 2. Qb1# *