Bad times for Queen's Indian lovers

The Queen's Indian is one of Black's most respected defenses to the queen's pawn opening. It's an established favorite among top GMs such as Kramnik, Anand, Adams, J. Polgar and (when he was at his best) Karpov. The opening is considered a hypermodern one, since Black does not strive to occupy the center with his pawns immediately: he just moves his queen's bishop on "b7" to put some pressure on the e4-square, in order to prevent White from occupying it. But what happens if White succeed in achieving this target by sacrificing a pawn? Ask that to Ivanchuk, who resigned after only 27 moves to Magnus Carlsen last march in Monte Carlo. They played a popular variation of the Queen's Indian, when the wonder boy from Norway found a strong improvement at move 15 and soon got the initiative, crushing his opponent. Queen's Indian lovers have to be very careful... Let's see the game.