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Hans Georg Lachmann vs Klaus Junge
GER-ch (1941), Bad Oeynhausen GER, rd 4, Aug-??
Semi-Slav Defense: Noteboom Variation (D31)  ·  0-1



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Kibitzer's Corner
Feb-09-08  orionstar: white must win but many washting move to mate it's a pitty
Premium Chessgames Member
  Gypsy: <35.Qh7?> Pushing pawns should win.
Jun-21-08  lost in space: Black played something like the Noteboom System with the very strange 7...Qb6 (try to keep the extra pawn) and 8...Qb7. It is unclear for me, why. Maybe to protect f7 and/or the 7th rank?!

Afterwards the game gets very complicated, especially due to the very risky way Black organized the defence (if you can call it a defence as it is very agressive and active):

click for larger view

13..fxg5?? may look interesting, but after 14. Qe5 Nf6 15. Nxf6 Bxf6 16. Qxf6 White is better.

13...h5! was the best move. After 14. Ne4 Nh6 the game is in balance.

15. Be2?!;
15..Qf3 fxe5 16. Qxh5 Kf8 17. Nxe6 Bxe6 18. Qxe5 looks better for me

15...Nf5! and Black is a bit ahead. (15..fxg5?? Bxh5+ Kd8 17. Ba5+ Qb6 18. Bxb6 or 15...fxe5??16. Bxh5+ Kd7 17. Qxe5

After 19. Bf3 it seems that Black has to loose material, but 19...Nc6! keeps the balance:

click for larger view

Jun-21-08  lost in space: After 21. dxe5 Black played Nfe7?!.
21. Kf7!? is maybe better. 22. Bxh5+ Kf8 23. Bb4+ Nxb4 24. Qd8+ Kg7 25. Qg5 Kf8 26. Qd8+ Kg7 25. Qg5+ Kf8 =

After 22. Qg7 the game is even. An idea was 22. Rd1 Rh7 23 Bb4

23...Rf8 was important as the Bf3 is very dangerous and Black is willing to play Rxf3.

The critical position of the game is reached after 34...Kb7

click for larger view

Is 35. g4 winning?

Jun-21-08  lost in space: 34. g4 is maybe better than the text (34. Qh7), but is not winning:

34. g4 a3! 35. bxa3 Qxa3 and it is as Easy for White to win as to loose: 36. Qxe5?! 36. Kb6 37. Qg7 c3 39. h8Q Rxh8 40. Rxh8 Rxh8 41. Qxh8 Qb4+ 42. Ke2 Be6+ (threat: Bc4#) 43. Kf1 cxd1Q+ Bxd1 with big Black advantage

Maybe 36. h7 is a bit better: 36. Qb2! 37. g5 Ra2 38. Rh2 c3 39. Qxe5 Ra1 40. Rxa1 (or 40. g6 Rxd1 41. Bxd1 Qd2+ 42. Kf1 Qxd1 43. Kg2 Nxe5 ) 40...Qxa1 41. Ke2 Qa2+ 42. Ke1

Summary: 34. g4 is not winning. It seems, that Black has better chances when playing active. 34...a3! is the key move for Black

Jun-21-08  lost in space: Other pawn-moves like 34. h7 are not better. From my point of view "pushing pawns" does defentely not win.

From move 34 to move 44 it seems that the game is an a very delicated balance.

The loosing move of the game is 45. Rxe5??

Much better was 45. Rb4 Kc5 46. fxe5 Kxb4 exd6 Kb3 =

Jun-21-08  lost in space: Sorry, I recognized, that the number of the moves of my last 2 posts are partly wrong. It is not 34. g4 it is 35. g4.

This does not change the anayse of my second last post, simply add 1 to all move-numbers. The same is true for the first part of the my last post.

Sorry again

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