[Event "USA-USSR Radio match"] [Site "?"] [Round "0"] [White "Denker"] [Black "Botvinnik"] [Result "0-1"] [ECO "D31"] [Opening "Semi-Slav: 4.Nf3"] 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 Nf6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. exf6 Bb7 12. Be2 Qb6 13. O-O {Denker was r with Botvinnik's experience in this line and was prepared for this game. Botvinnik was also ready.} 13... O-O-O 14. a4 {But this came as somewhat of a surprise. Still, the move is not very good, because it allows me to advance my queenside pawns and does little to disrupt my queenside play.} 14... b4 15. Ne4 c5 16. Qb1 Qc7 17. Ng3 {17.h4 Bh6} 17... cxd4 {The point of this move is to deflect the bishop from coverage of the f3- square.} 18. Bxc4 Qc6 19. f3 {White was for ced to accept this weakening of the a7-g1 diagonal because 19.Bf3 was no longer possible. If there were no pawn at d4, Botvinnik could now win the bishop at g5 by playing Qc5+.} 19... d3 20. Qc1 {Defending the bishop.} 20... Bc5+ 21. Kh1 Qd6 22. Qf4 { Now Black finishes with a fine mating combination. Do you see how it works?} 22... Rxh2+ 23. Kxh2 Rh8+ 24. Qh4 Rxh4+ 25. Bxh4 Qf4 0-1