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White to play and win!!
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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?
Nice puzzle, needed to cheat 
, VERY GOOD
, 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?
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.
Tip: What's the weakest square on the board?