This video teaches the very important endgame topic of triangulation. For more pawn endgame lessons check out https://penguinchess.teachable.com/p/...
Key ideas:
By moving in a triangle, we reach the same exact position as we started, however now it's blacks turn to move
Why does this work? Because it was an odd number of moves (3) to reach the original square
Because of our f6 pawn, enemy king can’t do the same