Tactics 2

A queen-side attack in the Philidor....

For some reason, White has played Kh2. This gives Black an opportunity to win a pawn.

16. ...Kh2 loses a pawn

There follows 17.... Bxd3 18. Qxd3 ( Bxh6 19. Bxe2 ) Bxf2 19.Rxf2  axb 

The b-pawn cannot now  be captured because of Rxa1 !  An example of removing the guard : a double guard in this case.