>After rook takes queen, couldnt it simply interpose infront of the bishop?
Yes, and when bishop takes you're still in check and the bishop is protected by the pawn. The only legal move is queen takes on e6, followed by pawn takes on e6. Now white has a passed pawn that cannot be stopped and black is left with a useless black knight.
When Fischer (white) played Queen e8, Benko realized that the continuation would force him to lose his rook and queen and leave Fischer in a completely won endgame with checkmate in a few moves, so he resigned. It's a brilliant deflection sacrifice to reach a completely won endgame position.
rocket league, one of the best competitive videogame ever made, and unique
Julian James
>Im not disagreeing this is brilliant, but couldnt black then go f5, then knight to f6 to capture the pawn if it moves to promote?
Unfortunately white has rook g6, paralyzing his the black knight. Now he has the (equally terrible) choice of either sacrificing his knight to stop the passed pawn, or "winning" the rook but allowing the e-pawn to promote to a queen.
I imported the game on Lichess and it confirms the same. Everything black tries is just dead lost.