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#21465 by Low Impact Chess

12:48, March 28, 2019 by Low Impact Chess

[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

#21463 by Noname

17:41, March 27, 2019 by Noname

[Event "Prague ol (Men)"] [Site "Prague CSR"] [Date "1931.07.12"] [Round "2"] [White "Fricis Apsenieks"] [Black "Arthur William Dake"] [Result "1-0"] [ECO "B13"] [BlackElo "2330"] [Annotator "Doe,John"] [PlyCount "67"] [EventDate "1931.07.11"] 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Bd3 {This line is appealing to amateurs because it is a simple and easy to learn answer to the Caro-Kann. By clarifying the central tension white gives himself a clear plan of attack using the half open e-file and the e5 square. And, it can be hard to meet even for GMs as players like Fischer, Timman and Browne, among other, discovered. Black is not without resources but he needs to know what he's doing.} Nc6 5. c3 Nf6 {Also popular is 5...Qc7.} 6. h3 {Black will now have difficulties developing his B because white has prevented ...Bf4 with 4th move and with this move prevents ...Bg4.} e6 7. Qe2 Be7 8. f4 {Clearly Apscheneek has aggressive intentions or else he would have played the normal Nf3 and castled.} a6 9. g4 {Who would have guessed that when he played his last move Apscheneek intended this?!} b5 {Dake is equally aggressive and invites white to play 10. g5 which can be met by 10...Ne4 inviting white to win a P with 11.Bxe4 dxe4 12. Qxe4. But that would be too dangerous because after 12...Bb7 white's Q and R are on the same diagonal as the B and after ...Qc7 defending the B there is the threat of ...Nxd4. Also, white's K is wide open.} 10. b4 Bb7 11. Nf3 Qb6 { The idea of 11...Ne4 is still feasible.} 12. a4 {Playing on both sides of the board.} bxa4 13. Rxa4 Ne4 {White still can't safely take the N and must defend against the fork on g3.} 14. Rg1 {With his next move Dake chose not to play an interesting sacrifice. 14...Nxc3 15.Nxc3 Nxd4 16.Nxd4 Qxd4 attacking the N on c3 and the R on g1. Not surprising... Dake had a solid, positional style.} g6 { Intending ...f5 to hinder white's K-side play.} 15. Be3 f5 16. gxf5 exf5 17. Qa2 {With his K-side attacking chances stymied, white turns his attention to black's a-Pawn and d-Pawn.} Nf6 {Both sides now engage in repositioning their Ns.} 18. Nbd2 Nd8 19. Nb3 Ne4 20. Bd2 Ne6 21. Nc5 {This attacks the a-Pawn four times while it is only defended three times. Nevertheless, it would not be safe to take it if black castles because of 21...O-O 22.Bxa6 Bxa6 23.Nxa6 Qb5! 24.Nc4 Nxf4! threatening ...Qe2 mate and ...Nxc3. So, if now 21...O-O 22. Ne5 and white stands well.} N6xc5 {Black still should have castled as the lesser evil because white not gets a protected passed P.} 22. bxc5 Qe6 23. Ne5 O-O 24. Rb4 {White gets good play on the open b-file and at this point has a strategically won game.} Qc8 25. Qb3 Ra7 26. Rb6 Bh4+ 27. Ke2 Bd8 28. c6 { White can win in a variety of ways. Besides the move he selected, he could also have sacrificed a N with 28.Nxg6 followed by the excavation of black's K.} Bxb6 29. Qxb6 Qa8 30. Bxe4 fxe4 31. Nxg6 hxg6 32. cxb7 Rxb7 33. Qxg6+ Kh8 34. Qh5+ {White mates in 3.} 1-0