[Event "St Petersburg"] [Site "St Petersburg RUE"] [Date "1912.03.14"] [Round "?"] [White "Alexander Alekhine"] [Black "Grigory Levenfish"] [Result "1-0"] [ECO "A43"] [Annotator "Stockfish 10 64 (10s)"] [PlyCount "37"] [EventDate "1912.??.??"] {A43: Schmid Benoni} 1. d4 c5 {Alekhine considered this a grave positional error even if it was prepared by 1...Nf6 because white gets a great positional advantage by simply advancing his Ps.} 2. d5 Nf6 3. Nc3 d6 4. e4 {Alekhine comments that now if black plays 4.e6 then 5.Bc4 black would be left with a weakness on d6.} g6 5. f4 Nbd7 {White gets a considerable advantage after this, so the immediate 5...Bg7 was better. That way after 6.Nf3 O-O if white plays 7.e5 (this is now premature) black can play 7...Ne8 and is at least equal.} 6. Nf3 {Now if 6...Bg7 7.e5! with a very strong attack. Not that .it matters because white is going to play 7.e5 anyway} a6 7. e5 {Black's N has no good retreat square, but undeveloping it with ...Ng8 is probably the best he has.} dxe5 8. fxe5 {Black's opening has already been refuted.} Ng4 9. e6 {This demolishes black's position.} Nde5 {The only other try was 9...fxe6 but after 10.dxe6 Nb6 11.Qxd8+ Kxd8 12.Bf4 and 13.Ng5 black's position is still lost.} 10. Bf4 Nxf3+ {Playing 10...Bg7 would not have been any better. Black was hoping for 11.Qxf3 fxe6 when he at least gets a little play.} 11. gxf3 Nf6 12. Bc4 {Alekhine comments that this is preferable to the immediate 12.exf7+ because now the threat is much more potent. That comment is questionable. After 12.exf7+followed by Qd2 and O-O-O white has excellent attacking possibilities. Now better would have been 12...Bg7 then after 13.exf7+ Kxf7 14.d6+ e6 followed by ...b4 and black would have sufficient play.} fxe6 13. dxe6 {Alekhine now evaluates 13...Qb6 which threatens two Ps as being insufficient as shown by an unexpected sacrificial combination. The alternative of 13...Qxd1+ would allow white to win a P and at the same time maintain his pressure.} Qb6 14. Qe2 {Baiting a trap into which Levenfish falls. Even after the better 14...Bg7 and 15...O-O black would have been in difficulties.} Qxb2 {Alekhine wrote that there appears to be little danger in this move because after 15.Kd2 Nh5 16.Be5 and Bh6+ black would be winning. Alekhine overlooked that 16.Be5 is a serious mistake. After 15.Kd2 Nh5 white can win with 16. Rab1 (Instead of 16.Be5??) Nxf4 (Also losing is 16... Qa3 17. Bb5+ axb5 18. Qxb5+ Kd8 19. Rhd1 and white wins) 17. Qe5 and white wins because black's Q, R and N are attacked} 15. Nb5 {This N attack decides the issue in a few moves whether black captures it or both Rs. If 15...axb5 16. Bxb5 Bd7 17.exd7+ Nxd7 18.Be5 forking both the Q and R.} Qxa1+ 16. Kf2 Qxh1 17. Nc7+ Kd8 {White has a mate in 9 moves.} 18. Qd2+ Bd7 19. exd7 {Mate in 7 cannot be avoided.} 1-0

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