Chessville UCO Opening Instruction -Orthoschnapp-Khan Gambit - by Clyde Nakamura - The Search for Dragons and Mythical Chess Openings

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Orthoschnapp-Khan Gambit
by Clyde Nakamura

There exists a chess opening gambit against the French Defense (1.e4 e6) called the Orthoschnapp Gambit, which was developed by International Master Stefan Buecker of Germany. The moves are: 1.e4 e6 2.c4 (normally White plays 2.d4 against the French Defense) 2…d5 3.cxd5 exd5 4.Qb3 and now the pawn at e4 can be taken with 4…dxe4.

But White has compensation after 5.Bc4 which attacks the Black f7 pawn. Black has several options with moves such as Qd7, Qe7, Nh6, and Be6. Both Nh6 and Be6 are not really playable because if 5…Be6 6.Bxe6 fxe6 7.Qxb7 Nd7 White can play 8.Qxe4+ picking up an extra pawn. The other move 5…Nh6 can be a problem because after 6.d3 White threatens to capture the Knight at h6 with Bxh6 which leaves the f7 pawn vulnerable to Bxf7+. Therefore the only playable moves are 5…Qe7 or 5…Qd7.

Orthoschnapp Gambit
Starting Position

...after 4.Qb3

I had wondered if a similar type of gambit could be created against the Caro-Khan Defense (1.e4 c6), so I played some test games on the Playchess.com server on the Internet. The moves for this new gambit are: 1.e4 c6 (Caro-Kann Defense) 2.c4 d5 3.cxd5 cxd5 4.Qb3 (starting position of this gambit) and the pawn at e4 hangs. And after 4…dxe4 White has 5.Bc4 attacking the Black pawn at f7. However in this position Black can play 5…e6 which guards the pawn at f7. And also Black has no pawn at c7.

Orthoschnapp-Khan Gambit

Starting Position

If 4…dxe4 5.Bc4 e6 and now I play 6.d3 to exchange off the pawn at e4 with the d3 pawn. The White Bishop at c4 does not belong on the c4 square where it has no useful purpose aiming at the e6 pawn. Basically it is biting on rock.

The bishop is better placed at d3 after the exchange of pawns so that when Black castles Kingside, this Bishop will be aiming at the pawn on the h7 square.

White can play Nf3 and 0-0 and play Rd1 which lines up with and threatens the Black Queen on d8.

Position after 7.Bxd3

The game listed below is the only game that I found in my 15 million chess databases with this opening gambit. I do not believe that White played this opening correctly because White got a cramped middle game and the coordination of the minor pieces was very bad.

A. Van Weersel – Julia Laurens Faber Cup, Hyerois FRA 7/9/01

{B10: Caro-Kann: 2 d3 and 2 c4} 1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3 dxe4 5. Bc4 e6 6. Nc3 Nf6 7. Nge2 (7. d3 exd3-/+) 7... Be7 (7... Nc6 8. Ng3-/+) 8. O-O (8. Qc2 Nc6 9. Nxe4 Bd7-/+) 8... O-O (8... Nc6 9. Qc2-/+) 9. Ng3 b6 10. Ngxe4 Nxe4 11. Nxe4 Bb7 12. Re1 (12. Qe3 Nc6 13. b3 Qd4-/+) 12... Nc6 13. Qh3 Nd4 14. Bd3? (14. Rb1 Rc8 15. b3 b5 -/+) 14... g6 (better is 14... f5!? {makes it even easier for Black} 15. Nc3 Rf6 -+) 15. b3 f5 16. Nc3 Bf6 (16... Nf3+ 17. gxf3 Qxd3 18. Re3 -+) 17. Ba3 Re8 18. Rac1 (18. Kh1 a6 -/+) 18... a6 (better is 18... Nf3+ {!} 19. gxf3 Qxd3 -+) 19. Ne2 =/+ Qd7 20. Nxd4 Bxd4 (20... Qxd4? 21. Rc7 Bh4 22. g3 +-) 21. Re2 (21. Bf1 e5 =/+) 21... Rad8 +- 22. Kf1 e5 23. f3 (23. Bb4!? -/+) 23... b5 -+ 24. Qh4 (24. Bb1 Rc8 25. Rce1 a5-+) 24... Rc8 (24... e4!? 25. Rce1 Bb6 26. Bc2 -+) 25. Rxc8 Rxc8 26. Qe7 Qxe7 27. Bxe7 Kf7 28. Bb4 (28. Bg5 h5-/+) 28... Rd8 (28... Bd5 29. Re1 -+) 29. Re1-/+ Ke6 30. Ba5 Rd6 31. Rc1 Rc6 32. Rxc6+ Bxc6 33. Bc3 Kd5 34. Ke2 e4 35. fxe4+ fxe4 36. Bc2 Bxc3 (better is 36... Ke5! -/+) 37. dxc3 = a5 38. Ke3 Ke5 39. c4 b4 {Black gains space} 40. Bd1 g5 41. Bg4 h6 42. Bh5 a4 43. h3 axb3 44. axb3 Bd7 45. Bg6 Bc6 46. Bh5 1/2-1/2

1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3 dxe4 5. Bc4 e6 6. d3 exd3 7. Bxd3

The games listed below all have the following opening moves. This is my line that has been developed for a Kingside attack if Black castles Kingside. In this line White achieves harmonious development where the minor pieces are well placed. Black is normally 2 moves behind in development and the pawn played to e6 blocks Black's bishop at c8 from developing properly. In this line White shifts the Queen from b3 to a4 and then onto h4 where the Queen will assist in the Kingside attack. White avoids trading Queens because the White Queen is needed in the Kingside attack. If Black castles Kingside and plays h6 then White has the Bishop sac for 2 pawns sacrifice on the h6 pawn. And if Black plays g6 then White will have to take advantage of the weak dark squares f6, g7 and h6 surrounding the Black King.

Evilone (1897)- Patzii (1793) Playchess.com 2/6/06 Game 5 min.

1. c4 c6 2. e4 d5 3. cxd5 cxd5 4. Qb3 {Orthoschnapp-Khan Gambit} dxe4 5. Bc4 e6 6. d3 exd3 7. Bxd3 Nf6 8. Nf3 Be7 9. O-O O-O 10. Rd1 {White lines up the R with the Black Q and threatens to play Bxh7+ winning the Black Q.} Qb6 11. Qa4 {I was playing for the Kingside attack and had to avoid trading Queens. I needed the Q to conduct a Kingside attack.} Bd7 12. Qh4 g6 13. Nc3 Nc6 14. Bg5 Qd8 {Black had to drop back and further guard the N at f6 otherwise I will pick it off.} 15. Bb5 {Black is really hemmed down with playing defense. White has all the play.} Nh5 16. Bxc6 Bxg5 17. Nxg5 bxc6 18. g4 Nf6 (18... h6 19. gxh5 hxg5 20. Qd4 gxh5 21. Ne4 f5 22. Nc5 Qc7 23. Nxd7 Rfd8 24. Rac1 {+- 3.30}) 19. Rd3 Qe7 20. Rh3 Qb4 [diagram]

Position after 20...Qb4

21. Nce4! {a strong move which ends the game} Kg7 22. Qh6+ Kg8 23. Nxf6+ 1-0

Evilone (1945) – Tiger15 (1944) Playchess.com 2/18/06 Game 5 min.

1. c4 c6 2. e4 d5 3. cxd5 cxd5 4. Qb3 dxe4 5. Bc4 e6 {forced, the other move Nh6 gets Black into trouble after d3 and the N at h6 will lead to doubled pawns on the h file.} 6. d3 {played to free White's pieces} exd3 7. Bxd3 {the White B is better placed on d3 where it will assist in the Kingside attack. On c4 is is biting on granite at e6.} Nc6 8. Nf3 Nf6 9. O-O Be7 10. Rd1 {lining up the Black Q with the White R. Black has to move the Q to a safer square.} Qb6 11. Qa4 {I did not intend to trade Queens because I need the White Q in the Kingside attack.} O-O 12. a3 {to prevent Qb4} Bd7 13. Qh4 Rad8 14. Nc3 {still attempting to develop all my pieces to prepare for the Kingside attack} h6 {A weakness in the Black Kingside position. White can sac a B for 2 pawns on h6 and do a possible Rook lift to d3 to threaten checkmate.} 15. Bxh6 gxh6 16. Qxh6 Qc5 17. Ng5 Ne5 18. Bh7+ Kh8 [diagram]

Position after 18…Kh8

19. Nce4 Neg4 20. Qh3 Nxe4 (20... Nxf2 {Deep Fritz 8 found this move which gives Black the advantage.} 21. Nxf2 Qxg5 22. Bc2+ Kg7 23. Rd3 Nh5 24. Ne4 Qg6 25. Rf1 f5 26. Ng3 Bc5+ 27. Kh1 Rh8 28. Ne2 {-+ 7.18}) 21. Bxe4+ 1-0

DarthMusashi (1871) – Hourmas (1867) Playchess.com 2/17/07 Game 5 min.

1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3 {the Orthoschnapp-Khan Gambit} dxe4 5. Bc4 e6 6. d3 {Actually the B is better placed on d3. The move d3 redeploys the B to d3 and releases the B at c1.} exd3 7. Bxd3 Nf6 8. Nf3 Nc6 9. O-O Be7 10. Rd1 {Black cannot castle right away because of Bxh7+ dropping the Black Q.} Qc7 11. Qa4 {Black will castle Kingside and I wanted to move my Q to h4 for a Kingside attack.} O-O 12. Nc3 a6 {Is this a usefull move since White intends to play Qh4.} 13. Qh4 b5 14. Bg5 Bb7 {Black is not paying attention to the position. since White will play Bxf6 and threaten checkmate on h7.} 15. Bxf6 h6 16. Bxe7 Nxe7 17. Rac1 Qb6 18. Be4 (18. Qxe7? {it seems I missed another free piece.} Bxf3 19. gxf3 Rfe8 20. Qb4 {+- 6.19}) 18... Bxe4 19. Nxe4 Nf5 20. Qf4 Rfd8 21. g4 Rxd1+ 22. Rxd1 Ne7 23. Nd6 Rf8 24. Ne5 Ng6 25. Nxg6 fxg6 26. Qe3 Qa5 27. Qxe6+ Kh7 28. Qe7 (28. Ne4 {Deep Fritz 8 recommended this move but i believe my move was actually better.} Qb4 29. g5 h5 30. Kg2 h4 31. Rd7 Qc4 32. Qe7 Rf7 33. Nf6+ gxf6 34. Qxf7+ Qxf7 35. Rxf7+ Kg8 36. Rxf6 {+- 16.64}) 28... Rf6 29. Ne8 Qa4 30. Qxg7# 1-0

DarthMusashi(1902)–Docent KNU(1969) Playchess.com 8/22/07 Game 3min.+1sec.

1. c4 c6 2. e4 d5 3. cxd5 cxd5 4. Qb3 {the Orthoschnapp-Khan Gambit} dxe4 5. Bc4 e6 {forced since White threatens Bxf7+} 6. d3 {played to further develop my pieces, and the B does not belong on the a2 to g8 diagonal since there is a pawn at e6 blocking it.It would be better placed at d3.} exd3 7. Bxd3 Nf6 8. Nf3 Be7 9. O-O O-O {threatening to win the Black Q with Bxh7+} 10. Rd1 Qc7 11. Qa4 {I have to move my Q to the Kingside, it does not belong on b3.} Nc6 12. Qh4 e5 13. Nc3 {to prevent the pawn push e4} a6 {Not sure that move was for. I did not intend to play my N to b5 chasing the Black Q. My main focus is the Black Kingside.} 14. Bg5 h6? [diagram]

Position after 14…h6

{This is a key error which weakens the Black Kingside. The B sac on h6 is very strong because it blows open the Black Kingside.} 15. Bxh6 gxh6 16. Qxh6 e4 17. Nxe4 Nxe4 18. Bxe4 f5 {forced since White threatens mate at h7.} 19. Bd5+ Rf7 20. Qg6+ Kh8 21. Bxf7 {the game is over since I have mate in one with 21...Bf8 22.Qg8+mate} 1-0

Chess Engine Games

The following are chess engine games with my line (1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3 dxe4 5. Bc4 e6 6. d3 exd3 7. Bxd3). The games were played at game 5 minute on an Athlon Dual Core computer. I had my chess engine Deep Fritz 8 analyze the games at 5 seconds per move. But even at 5 seconds per move my computer is looking at over 2 million positions per second. All the chess engines are elo 2600+ strength. It is strange that most of these chess engines did not play for the direct Kingside attack. I could be because most chess engines have a strong material bias built into its programming.

Naum 2.0 – Kaissa 1.8a Orthokhan2 Engine Tournament 1/21/08 Game 5 min.

{B10: Caro-Kann: 2 d3 and 2 c4} 1. e4 c6 {Prevents intrusion on b5} (1... e5 2. Bc4 =) 2. c4 (2. d4 d5 3. exd5 cxd5 4. Bb5+ Nc6 +/=) 2... d5 = 3. cxd5 cxd5 4. Qb3 (4. exd5 Nf6 =) 4... dxe4 =/+ 5. Bc4 (5. d3 exd3 6. Bxd3 Nd7 =/+ ) 5... e6 {Covers d5} 6. d3 exd3 7. Bxd3 Bd6 (7... Nd7 8. Nf3 =/+) 8. Nf3 =/+ Nf6 9. O-O O-O 10. Bg5 h6 11. Bxf6 Qxf6 12. Nc3 Be7 13. Rfd1 Nd7 14. Qc2 Rd8 15. Be4 Rb8 16. Rac1 Nc5 (16... a6!? -/+) 17. Bh7+ += Kh8 18. Rxd8+ Bxd8 19. Ne4 Nxe4 20. Bxe4 Bb6 21. Qa4 Qe7 22. Ne5 Kg8 23. Rc3 a6 24. Bb1 Qf8? (24... f5 25. Qb3 Qf6 26. Qxb6 Qxe5 27. Qd8+ Kh7 28. Bd3 +/=) 25. Qc2 (better is 25. Nxf7 {the advantage is on the side of White} Qxf7 26. Rf3 +-) 25... f5 +/= 26. Ng6 Qd6 27. Rxc8+ Rxc8 28. Qxc8+ Kf7 29. Nh8+ (29. Qxb7+? {doesn't solve anything} Kxg6 30. g3 Qc5 -+) 29... Kf6 30. Bc2 Qc5 31. Qxc5 (31. Qxb7?? {leads to mate in 2} Qxf2+ 32. Kh1 Qe1#) 31... Bxc5 32. Bd1 g6 33. Bb3 b6 (33... Bd4 34. Nxg6 Kxg6 35. Bxe6 +/=) 34. Bxe6 Kxe6 35. Nxg6 Bd6 36. Kf1 b5 37. Ke2 Kf6 38. Nh4 Be5 (38... a5 39. Nf3 +/-) 39. b3 Ke6 40. Ke3 Bd6 41. f4 Be7 42. Nf3 Bc5+ 43. Ke2 Kd5 44. Kd3 Bf2 45. a3 h5 46. g3 Bb6 47. a4 Bf2

48. Nh4 Ke6 49. Kd2 Bd4 50. Ke2 Bg1 51. h3 Bd4 52. Ng2 bxa4 53. bxa4 Bf6 54. Kd3 Bd8 55. Ke3 Bf6 56. Ke2 Bd4 57. Kf3 a5 58. Ne3 Bb6 59. Nc4 Bc7 60. Ke2 Kd5 61. Kd3 Ke6 (better is 61... Bd8 +-) 62. Kd4 Bd8 63. Kc5 Be7+ (63... h4 {is no salvation} 64. gxh4 Bc7 65. h5 +-) 64. Kb5 Bb4 (64... h4 {cannot undo what has already been done} 65. gxh4 Bxh4 66. Nxa5 +-) 65. Nxa5 Be1 66. Nc4 Bxg3 (66... Kd7 {otherwise it's curtains at once} 67. Kb6 Bxg3 +- ) 67. Kc6 Be1 (67... Bxf4 {does not improve anything} 68. a5 Bb8 69. Kb7 +-) 68. a5 Bf2 [diagram] (68... Bxa5 {there is nothing else anyway} 69. Nxa5 Ke7 +-)

Position after 68…Bf2

69. Nb6 Be3 70. a6 Bxf4 71. a7 {53sec-35sec} (71. a7 Be3 72. a8=Q Bxb6 73. Kxb6 +- ) 1-0

Belka 1.8.7 – Patriot 2006 Orthokhan2 Engine Tournament 1/21/08 Game 5 min

{B10: Caro-Kann: 2 d3 and 2 c4} 1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3 dxe4 5. Bc4 e6 {Secures d5} 6. d3 exd3 7. Bxd3 Nf6 8. Nf3 Bd6 9. Nc3 O-O 10. Be3 Na6 11. O-O-O (11. Rd1 Qe7 =/+) 11... Qe7 12. Ng5 Nc5 13. Qc2 Nxd3+ 14. Qxd3 Bb4 15. Kb1 h6 16. Nge4 b6 17. Nxf6+ Qxf6 18. Bd4 Qg5 (18... Qh4 19. g3 Qe7 20. a3 -/+) 19. h4 Qe7 (19... Qxg2?? {the pawn is indigestible} 20. Rhg1 Qg6 21. Rxg6 fxg6 22. Be5+- (22. Qxg6?! e5 23. Qc6 Bf5+ 24. Ka1 exd4 25. Qc4+ Rf7 26. Qxb4 dxc3 27. Qxc3 Re8 +-)) 20. a3 (20. Rhe1 Bb7 (20... Qxh4?! 21. Bxg7 Kxg7 22. Re4 =) 21. Qg3 f6 -/+) 20... Bc5 21. Bxc5 Qxc5 22. Ne4 Qa5 (22... Qc6 23. Rhe1 -/+) 23. Nd6 Ba6 24. Qg3 Rad8 25. Rd4 Qc5 26. Rhd1 Be2 27. R1d2 Bh5 (27... b5 28. f3 Kh7 29. b3 =/+) 28. Rc4 (28. Ka2 Bg6 -/+) 28... Qa5 (28... Bg6+!? {must be considered} 29. Ka2 Qa5 =/+) 29. b4 = Qa4 30. Rcd4 Rb8 (30... Bg6+ !? 31. Kb2 Kh7 =) 31. b5 +/= Qa5 32. Rb4 Rbd8 (32... Rfc8 33. Nxc8 Rxc8 34. Kb2 +/=) 33. Kb2 (33. Qe3!? Rxd6 34. Rxd6 +/-) 33... a6 +/= 34. Qe3 axb5 35. Rxb5 Qa8 36. Rxh5 Qc6 37. Nb5 Rc8 (37... Rxd2+ 38. Qxd2 Qxg2 39. Re5 +/=) 38. Nc3 +/- Rc7 (better is 38... Qxg2 39. Rb5 Rc4 +/-) 39. Qf3 (39. g4 Rfc8 40. Rd3 Qc4 +/-) 39... Qc4 (better is 39... Qxf3 {and Black can hope to survive} 40. gxf3 f5 =) 40. g4 +/- Rfc8 41. Rd3 Qa6 42. Re5 b5 43. Qd1 b4 44. axb4 Qb6 (better is 44... Kh7!? +-) 45. Rd8+ Kh7 46. Rxc8 Qxb4+ (46... Rxc8 47. Rb5 Qxf2+ 48. Qc2+ Qxc2+ 49. Kxc2 +-) 47. Qb3 Qxb3+ 48. Kxb3 Rxc8 49. Ra5 Rc7 50. Ne4 Rc1 51. Ra7 Rg1 52. Rxf7 Rxg4 (52... Kg8 53. Rc7 Rxg4 +-) 53. Nf6+ Kg6 54. Rxg7!+ {Theme: Double Attack} Kxg7 55. Nxg4 Kg6 56. Kc4 Kh5 57. Ne3 Kxh4 (57... Kg6 {otherwise it's curtains at once} 58. Kd4 Kf6 +-) 58. Kd4 Kg5 59. Ke5 Kh4 60. Kxe6 Kg5 61. Nd5 h5 62. f4+ {1:04-57sec} (62. f4+ Kg4 63. f5 +-) 1-0

Fritz 10 – Aristarch 4.50 Orthokhan1 Engine Tournament 1/21/08 Game 5 min.

{B10: Caro-Kann: 2 d3 and 2 c4} 1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3 dxe4 5. Bc4 e6 6. d3 exd3 7. Bxd3 Nd7 8. Bc2 Ngf6 9. Nf3 Bc5 10. O-O O-O 11. Bg5 h6 12. Bh4 g5 13. Bg3 Nh5 14. Na3 Nxg3 15. hxg3 Qb6 16. Qc3 Rd8 17. Nc4 Qc7 18. Rad1 Be7 19. Rfe1 a5 20. Rd4 Nf6 21. Rxd8+ Bxd8 22. Qd2 Be7 23. Rc1 Qc5 24. Nce5 Qb4 25. Qe2 Bd7 26. Bg6 Be8 27. Bd3 Qd6 28. a3 Rd8 29. Nd2 Qd5 30. Ndf3 Bc5 (30... Bd6!? 31. Qe1 b6 {-/+}) 31. Rd1 = Ne4 32. Ng4 Ba4 (32... Qb3 33. Kh2 f5 34. Bc2 =) 33. Rd2 +/= (33. Nxh6+ Kg7 34. Bc2 Bxf2+ 35. Kh2 Bxg3+ 36. Kh3 g4+ 37. Kxg4 f5+ 38. Kh3 Qxd1 39. Bxd1 Rxd1 {-+}) 33... Bxf2+ (33... Nxd2 {Theme: Deflection from f6} 34. Nf6+ {A double attack}) 34. Kh2 +/- (34. Nxf2 {is clearly weaker} Nxd2 35. Nxd2 Bc2 36. Bxc2 Qxd2 -/+) 34... Bg1+ (34... Bxg3+ 35. Kh3 Bc7 36. Bxe4 +/- (worse is 36. Qxe4 Qxe4 37. Bxe4 h5 38. Nf6+ Kh8 -/+) (36. Nxh6+ ?! Kg7 37. Bxe4 Qc5 38. Rxd8 Bxd8 =/+)) 35. Kh3 +- Nxd2 36. Nf6+ Kf8 (36... Kg7 37. Nxd5 Nxf3 38. Nc3 (38. gxf3 ?! Rxd5 39. Be4 Rc5 +/=) 38... g4+ 39. Kxg4 +-) 37. Nxd5 +- Nxf3 38. Nc3 (38. gxf3?! Rxd5 (worse is 38... exd5 39. Qe5 +/-) 39. Be4 Rd7 +/=) 38... Rxd3 39. gxf3 (39. Qxd3?? {going for material but overlooking...} g4+ 40. Kxg4 Ne5+ 41. Kh4 Nxd3 42. Nxa4 Bd4 -+) 39... Rxc3 40. bxc3 Bc6 41. Kg2 Bb6 42. g4 h5?? { but even a better move would not have saved the game} (better is 42... Bc5 43. Qe5 Bxa3 44. Qxa5 Bc1 +-) 43. gxh5 g4 (43... Ke7 {doesn't get the cat off the tree} 44. h6 Kf6 45. Kh3 +-) 44. Qe5 gxf3+ (44... Ke7 {is no salvation} 45. h6 f6 46. Qf4 Bxf3+ 47. Kf1 +-) 45. Kf1 Ke7 (45... Bd5 {does not improve anything} 46. Qd6+ Kg7 47. Qxb6 +-) 46. h6 f6 47. Qf4 e5 48. Qg4 e4 49. Qg7+ Ke6 50. Qg8+ Kd6 51. h7 {1:27-42sec} (51. h7 Bd5 52. Qb8+ Kc5 53. h8=Q +-) 1-0

Strelka 1.8–Colossus 2007d Orthokhan1 Engine Tournament 1/21/08 Game 5 min.

{B10: Caro-Kann: 2 d3 and 2 c4} 1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3 dxe4 5. Bc4 e6 6. d3 exd3 7. Bxd3 Na6 (7... Nd7 8. Qb5 -/+) 8. Bc4 (8. Bxa6 Qa5+ 9. Nc3 Qxa6 =/+) 8... Nc5 9. Qc2 a6 10. Nf3 b5 11. Be2 Bb7 12. O-O Bd6 13. Rd1 Rc8 14. Nc3 Nf6 15. g3? {Controls f4} (15. Bf4 {! might be a viable alternative} Nce4 16. a4 -/+) 15... Na4 (15... Qe7 16. Qd2 Nce4 17. Nxe4 Nxe4 18. Qe1 -+) 16. Be3 (16. Bf4 Be4 17. Nxe4 Rxc2 18. Nxd6+ Kf8 19. Nxf7 Kxf7 20. Ne5+ Ke7 21. Rxd8 Rxd8 -+ (worse is 21... Kxd8 22. Bd1 Rc7 23. Nd3 =/+)) 16... O-O 17. Rd4 (17. Ng5 Qe7 -+) 17... Nxc3 18.bxc3 Qc7 19. Bd2 e5 20. Rh4 Rfd8 21. Rd1 e4 22. Nd4 Bxg3! {Demolishes the pawn shield} 23. hxg3 (23. fxg3 Rxd4) 23... Rxd4! {Eliminates the defender d4} 24. Qb2 (24. cxd4 {Exploits the pin} Qxc2) 24... Rd7 25. Rc1 Qc6 26. Be3 Qe6 (26... Rd3 {might be the shorter path} 27. a4 -+) 27. Bd4 Rcd8 28. Re1 h6 29. a3 (29. Bf3 Rc7 -+) 29... Ne8 30. Rf4 (30. a4 bxa4 31. Qa1 Bc6 -+) 30... Nd6 31. Qb4 f5 32. Rh4 Qa2 33. Rh2 Qd2 34. Kf1 (34. Qb1 Bd5 35. f4 Qa2 -+) 34... Bd5 35. Qa5 (35. a4 Bc4 36. f4 Bd3 37. axb5 Nxb5 38. Qb3+ Kh7 -+) 35... Ra8 36. Qb6 Qa2 37. Bc5 Nc4 38. Qg6 Bf7 39. Qc6 Rdd8 (39... Rad8 {makes it even easier for Black} 40. Qxa6 Ne5 41. Bd4 -+) 40. Bd4 Nd2+ (40... Nxa3?! 41. Bxg7 {Demolishes the pawn shield} Qe6 42. Qxe6 Bxe6 43. Bf6 -+) (40... Qxa3?! 41. Bxg7 {Demolition of pawn structure } Qd6 42. Qxd6 Rxd6 43. Bxh6 -+) 41. Kg1 Nb3?? [diagram]

Position after 41…Nb3

{what a pity, victory was in sight} (better is 41... Qe6 {and Black has prevailed} 42. Qxe6 Bxe6 -+) 42. Bxg7 {+- Demolition of pawn structure} Qd2 (42... Kxg7 {Decoy to g7} 43. Qxh6+) 43. Rxh6 ({Instead of} 43. Qxh6 Qxh6 (43... Qxe1+ 44. Kg2 Qg1+ 45. Kxg1 Bh5 46. Bxh5 Rd1+ 47. Kg2 Rg1+ 48. Kxg1 b4 49. Qh8#) 44. Bxh6 Rac8 =/+) 43... Bd5 (43... Qg5 44. Be5 Kf8 45. Rh8+ Ke7 46. Qb7+ Ke6 +-) 44. Qg6 Qxe1+ 45. Kh2 Qxf2+ 46. Kh3 Qxg3+ (46... Qg2+ {doesn't improve anything} 47. Kxg2 e3+ 48. Kg1 f4 49. Rh8#) 47. Kxg3 f4+ 48. Kxf4 e3 (48... Nc5 {a fruitless try to alter the course of the game} 49. Rh8#) 49. Bh8+ (49. Rh8#) 49... Kf8 50. Qg7+ Ke8 51. Bh5+ Bf7 52. Bxf7+ (52. Qxf7#) 52... Kd7 53. Bxb3+ (53. Bd5+ Kc8 54. Qb7#) 53... Kc8 54. Rc6+ Kb8 55. Qc7# 1-0

Declined Line #1 - 4…Nf6

Evilone (1976)- Eric Berne (1941) Playchess.com 10/10/04 Game 5 min.

1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3 {Orthoschnapp-Khan Gambit} Nf6 5. exd5 Qxd5 6. Bc4 Qe5+ (6... Qxg2 7. Bxf7+ Kd8 8. Qf3 Bh3 9. Qxh3 Qxh1 10. Kf1 e5 11. d4 exd4 12. Bf4 Qe4 13. Qg3 Nbd7 14. Nd2 Qe7 15. Qb3 {-+ 1.44}) 7. Ne2 e6 8. d4 Qc7 9. Nbc3 Nc6 10. Bf4 Qa5 11. O-O {White is actually 3 moves ahead in development. All of White's pieces are actively placed and White has safely castled. White is now ready for the attack.} a6 12. d5 exd5 13. Nxd5 Nxd5 14. Bxd5 Be6 (14... Nd8 15. Rae1 Be7 16. Nd4 Qc5 17. Re4 O-O 18. Rc1 Qa7 19. Be5 Bg5 20. Rc7 h5 21. Qc2 Qb6 22. Rxc8 Rxc8 23. Qxc8 Ne6 24. Qc4 {+- 6.39}) 15. Bxe6 fxe6 16. Qxe6+ Be7 17. Rfd1 Qh5 18. Qd7+ Kf7 19. Ng3 Qg6 20. Qxb7 (20. Re1 Rhe8 21. Qxb7 Ra7 22. Qb6 Bd8 23. Qb3+ Kf8 24. Rxe8+ Qxe8 25. Bd6+ Be7 26. Nf5 {+- 3.12}) 20... Na5? {this drops the N on the next move} 21. Qd5+ 1-0

Declined Line #2 - 4…e6

Evilone (1871) – Siroos (1886) Playchess.com 2/18/06 Game 5 min.

1. c4 c6 2. e4 d5 3. cxd5 cxd5 4. Qb3 e6 {Black declines the gambit with e6.} 5. Nc3 Nf6 6. exd5 exd5 7. Nf3 Nc6 (7... d4 8. Bb5+ Nc6 9. Ne2 Bc5 10. Qc4 Qb6 11. b4 Bd6 12. Nfxd4 O-O {=/+ 0.34}) 8. d4 Be7 9. Bd3 O-O 10. O-O Na5 11. Qc2 h6 12. Ne5 Be6 13. f4 Nc4 14. h3 Nxe5 {The White N at e5 is at a powerful post and had to be eliminated.} 15. fxe5 Ne4 16. Be3 Rc8 17. Rad1 Bb4 18. Bxe4 dxe4 19. Qxe4 Bxc3 20. bxc3 Bd5 21. Qg4 Kh8 22. Qh5 Kh7 [diagram]

Position after 22...Kh7

23. Rf6! { a really strong move} gxf6 (23... Be4 24. Rd6 Qe8 25. Rc1 Rc6 26. Rxc6 bxc6 27. Rf1 f6 28. Qe2 fxe5 29. Rxf8 Qxf8 30. dxe5 a5 31. Bd4 Qf5 {+/- 0.88}) 24. Qxh6+ Kg8 25. exf6 {White now threatens mate with Qg7+. Black has to sac the Q to prevent mate.} Qxf6 26. Qxf6 Rc6 27. Qg5+ Rg6 28. Qxd5 1-0

CONCLUSION

The Orthoschnapp-Khan Gambit is an excellent chess opening gambit to use against the Caro-Kann Defense (1.e4 c6) because it does not exist in any chess opening books. I found only one game (A. Van Weersel – Julia Laurens, Faber Cup, Hyerois FRA 7/9/01) in my 15 million game chess databases and White did not play the opening gambit correctly. The only other Orthoschnapp-Khan Gambit games are my games and some chess engine games I ran.

My line in this gambit (1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3 dxe4 5. Bc4 e6 6. d3 exd3 7. Bxd3) is designed for a quick strike on the Black kingside castled position. Black castles kingside in the majority of the games. However there exists other middle game strategies that are also playable such as attacking the middle or the queenside.

These other strategies are explored in the chess engine games. More test games and analysis will be needed to further study these other middle game strategies.

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