I expect you'll be able to solve this.

Tip: What's the weakest square on the board?

Comments welcome

What happens after that?

White takes the rook on a8. He will have a decicive material advantage and possibly an attack on the black king

please comment someone

why does black have to take the knight?

solved in first go.

Nice puzzle, needed to cheat , VERY GOOD

If black doesn't take the knight he only loose a pawn whice is not a decicive matterial advantage

youwon08 wrote: why does black have to take the knight?

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Because otherwise white will take on f7 with the knight, black's rook will have to come to g8, and white will come to d6 with the knight then take the rook on g8 with the bishop. Nice and simple.

Boring304 wrote: If black doesn't take the knight he only loose a pawn whice is not a decicive matterial advantage

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The rook will have to come to g8. Then the knight comes to d6 and wins. Look