How Vas held the draw against IM Ray Kaufman

It's extremely satisfying to hold a draw against an experienced international master. It's like an early birthday gift to myself. 
When I lost my last remaining pawn on the b file, I knew that the best I could do was draw. Luckily I remembered the correct set-up: The White King is in front of the e pawn and the White rook is behind it, far enough to avoid getting molested by the enemy King. Make note of this set-up, so you too can hold the draw against FIDE IMs. Below is the final position; White to play. IM Kaufman offered a draw.....

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NCM Vas Sladek vs IM Ray Kaufman, Van Rapid Chess League quarterfinal, 2019.

1. Rf8+ and if the Black King stays by the pawn we keep on checking; if the Black King walks, we attack the e-pawn again. Black can't make progress here. Note that the White rook is far away to avoid any King attacks.

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Front left: IM Ray Kaufman (and NCM Vas Sladek)