Piece Harmony: Knight and Rook

Some ideas from Tal's excelent book, Tal's winning chess combinations.

We're looking for the following end positions:

or:

Not a real position, but illustrating a point:

dude if i was in that position i wouldnt even try to win anymore.  black just lost 25 points for nothin. 

HAPPY 4/20

UGOLTSEV-ASHIKHIN (1976)

In Barkovsky-Korchnoi, the White Knight can occupy f6, but it is Black's move, and the GM offered a draw, thinking of parrying the threat with Bd6. White accepted, and was somewhat perplexed to be told he had a win:

URGEANU-ANASTIDES (1948)

The f pawn is defended by the Queen, and there is no good way of making use of the discovered check, as the White Queen is under attack,,,

I'll put uo some more later