Putting all White's pieces on the back rank! This move underlines the strength of the a4-knight, which also hampers the natural development of White's knight to c3.
And having eliminated the (powerful! ) a4-knight White held the draw.
Now the diagonals of both white bishops will be opened. Anand is facing his own twin gun!
Now all white pieces, including a central queen, are aiming at Black's kingside. Very soon this proved to be too much for Black.
Not an innocent bystander, but one exerting annoying pressure against g7, together with the b2-bishop!