Today the 13th round of the Linares tournament was played. Magnus Carlsen played as white against Teimour Radjabov. After 46 moves Carlsen was clearly ahead with a rook against a knight as the only remaining officers, the remaining play seemed a mere formality. But then, in his 47th move, Carlsen made a blunder.

Playing as Radjabov, make shure that Carlsen doesn't get a second chance:

can someone explain what the next move is after Nc3?

if Rxb3, then d2 is played, white will have no way of stopping the pawn after that.

So why was it a draw?

hey knightswimming, after Nc3, the d pawn can continue down the file and promote, and all black can do is either eat a pawn or exchange his rook for the newly promoted queen, and white is at a material advantage with more pawns and a knight! good knight, carlsen (geddit? - good knight) hahahaha

And Carlsen can (and did) easily force a draw by checking the black king with his rook; if the kind tries to slide over too far, then h7 and h8 win for white, so black can't do better than draw either.

good game

Nice Game.  Using the knight to protect.  Either Pawn may queen white queen can not stop it.

(complete chess newbie, sorry).  Why can't Carlsen just move his rook up to the top anyway after Radbajov moves his pawn forward one?

What pawn at what point in the game are we talking about? Radjabov does a lot of pawn one forward moves.

 So white saves a draw by the prospect of perpetually checking the black King?

More or less, one can't in normal conditions run a perpetual check with a rook. In this case the perpetual check solution relies on the black king having to stay in the corner area in order to prevent the white h pawn from promoting. There is also a host of lines relying on sacrificing the rook to get rid of blacks advanced pawns, and the knight thereafter being too far away to prevent the white king from aiding in making an exchange for blacks last pawn, thus leaving black with insufficient material for winning.

I meant the one at the end of the puzzle, to me it seems as if he could just move his rook to the top and prevent the passed pawn promoting.

Are shure you got the pawn progression directions right? Black moves down and promotes at the bottom row.

it is protedcted by te knight