[Event "Moscow"] [Site "?"] [Round "0"] [White "Konstantinopolsky"] [Black "Panov"] [Result "1-0"] [ECO "B03"] [Opening "Alekhine: 4.c4 Nb6"] 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 exd6 6. Nc3 Be7 7. Be3 Nc6 8. Be2 O-O 9. Nf3 {In this well known variation of Alekhine's Defence Black suffers from lack of elbow room, his pieces tending to obtruct each other. The Knight on b6 in particular has to play a very modest role} 9... Bg4 (9... Bf5 10. d5 -- 11. Nd4) 10. b3 Re8 11. O-O Bf6 (11... Bxf3 12. Bxf3 Bg5 13. d5 $1 $14) 12. Rc1 d5 {Completing the d-pawn center, but under the circumstances unfavourable to Black. However, Black was understandably uneasy abot the possibility of Pd5 as well as Ne4 or Nd5} (12... Ne7 13. Ne4) (12... Nd7 13. Nd5) 13. c5 Nc8 14. h3 Bh5 (14... Be6) 15. Qd2 h6 (15... N8e7 16. g4 Bg6 17. g5 ) 16. Rfe1 a6 17. Rcd1 g5 $2 {This move produces a serious weakening of Black's Kingside which White exploits immediately} (17... N8e7 18. g4 Bg6 19. h4 Nc8 20. g5 $40) (17... Bg6) 18. Nxg5 $1 Bxe2 19. Nxf7 { Demolishing Black's shaky fortress} 19... Kxf7 20. Qxe2 N8e7 { else the d-pawn falls} 21. Qh5+ Kg8 22. Bxh6 Qd7 (22... Bxd4 23. Rxd4) (22... Nxd4 23. Bg5 Bg7 24. Rxd4 Bxd4 25. Qg4 Bg7 26. Bf6) 23. Re3 Nf5 24. Nxd5 Qxd5 25. Rg3+ Nxg3 26. Qg6+ $1 Kh8 27. Qxf6+ Kh7 28. Qg7# 1-0