[Event "Candidates' Tournament"] [Site "?"] [Round "0"] [White "Smyslov"] [Black "Keres"] [Result "0-1"] [ECO "E61"] [Opening "King's Indian: 4.Bg5"] 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Bg5 c5 5. dxc5 {White's system is passive to begin with, and after this Black takes over the initiative. 5 e3 is better.} 5... Na6 6. g3 Nxc5 7. Bg2 d6 8. Rc1 { White didn't like the looks of 8 Nf3 Nfe4, but he's wasting time.} 8... O-O 9. b4 {White isn't well enough developed to be making this aggresive gesture. Black now gets a powerful initiative.} 9... Ne6 10. Bd2 a5 {Immediately exploiting White's eighth move. White must either allow lines to be opened for Black's pieces or give Black a lock on c5.} 11. a3 {11 b5 was the lesser evil. In combination with the a1-h8 diagonal the a-file is deadly.} 11... axb4 12. axb4 Nd4 13. Nh3 {The final error. White doesn't want to block the h1-a8 diagonal, his only asset, but now he gets overrun.} 13... Be6 14. Nd5 { 14 e3 gets trashed by 14...Bg4, and 14 c5 loses all his pieces to 14...Bb3, but the text isn't much better.} 14... Nxd5 15. cxd5 Bd7 {Threatening 16..Ba4.} 16. Rc3 Ra2 {Now Black threatens 17...Nxe2 among other things.} 17. Qb1 Qa8 18. Rc1 Bf5 {19 e4 allows 19...Bxh3 20 Bxh3 Nf3+.} 0-1