15.h3 Bh6 16.Rc2 Bxf3 17.Qxf3 Qxf3 18.gxf3 Rc8 19.Rd1 Ke7

The point of Leko's plan: instead of castling his king participates in the fight. 20.dxc6 Rxc6 21.Nd5+ Nxd5 22.Rxc6 bxc6 23.exd5

23...Rd8! Fine move: Peter sacrifices a pawn for exchanging the rooks. [After 23...cxd5 24.Rxd5 f6 25.Ra5+/= Black has difficulties because of his weaknesses (a7 pawn, g6 pawn, e6 square).] 24.dxc6 Rxd1+ 25.Bxd1 Kd6 26.Ba4 Bc1 27.b4 a6 28.b5 axb5 29.Bxb5 Ba3

White's extra pawn does  not mean any advantage. With this draw the World Champion has won the match.   1/2-1/2

 source : www.chessbase.com