Even Carlsen Also Played Ng6 @ Move 9

Ni Hua (2665) - Carlsen,M (2801) [B51]
Chess Classic London ENG (5), 13.12.2009

1.e4 c5 2.Nf3 d6 3.Bb5+ Nd7 4.d4 a6

5.Bxd7+ Bxd7 6.dxc5 dxc5 7.Nc3 e6 8.Bf4 Ne7

9.Ne5 Ng6 10.Qh5 Bc6 11.Bg3........

SIAPA KATA Ng6 tu tak Power, ILLEGAL MOVE ????