
Botwinnik-Vidmar | Isolated Pawn | f2-f4-f5 push
When the isolated d4 pawn is blocked by a piece on d5, then white needs a new strategy. He can use the e5 square for a strong knight outpost and f2-f4-f5 can undermined the d5 blockade.
World Champion Mikhail Botwinnik used the power of the light square bishop and the combined power of the other pieces to sacrifice on f7 and win an exchange:
In the afternoon I studied 1 hour of tactics. You can solve a few of them on the diagrams and can watch the video to solve the others: