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Berthold Koch vs Heinz Nowarra
German Championship (1938), Bad Oeynhausen GER, rd 4, Jul-27
French Defense: Advance Variation. Milner-Barry Gambit (C02)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
May-22-13
Premium Chessgames Member
  whiteshark: <kurz gekocht> Things are never as bad as they seem.


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May-22-13  JimNorCal: <white shark>: "Things are never as bad as they seem."

Sure. Sometimes they are worse :)

Feb-22-16  schnarre: ...Maintaining the attack on Black's King despite the Queenside pressure. Nice finish!
Jun-17-16  nalinw: I didn't see most of this - not the final mate which is also available after 21. ... Nxh5

and not

21. Qc2 - which is the answer to
21. ... hxg6

Jun-17-16
Premium Chessgames Member
  Penguincw: 20.Bxb6 nets a pawn, doesn't it? :p

Nice mate in the final position.

According to Game Collection: Checkmate: Checkmate Patterns, this checkmate can be classified as "Blackburne's mate".

Jun-17-16
Premium Chessgames Member
  al wazir: I rejected 20. Bxg6 because black doesn't have to take the ♖ on b2. After 20...hxg6 I don't see any winning continuation.

Instead I would have played the (much quieter) 20. Rxb6 Q any 21. Nxe6, and white is a ♙ to the good.

Jun-17-16  centralfiles: What about 21.Bxh7+ Followed by Qh5 ?
Jun-17-16  centralfiles: <Al wazir> If hxg6 Qb1 wins
Jun-17-16
Premium Chessgames Member
  al wazir: <centralfiles: If hxg6 Qb1 wins> Indeed it does. Thanks.
Jun-17-16  awd: what about 22. .. Bf5 ????
Jun-17-16
Premium Chessgames Member
  patzer2: Instead of today's brilliant Friday solution 20. Bxg6!! Rxb2 21. Qh5! (+3.48 @ 23 depth, Deep Fritz 15), I went for the more mundane alternative win 20. Rxb6 (+2.01 @ 22 depth, Deep Fritz 15).

Black's decisive mistake was the passive 19...b6?, allowing 20. Bxg6!! or 20. Rxb6 . Instead, Black can continue with a near level game with the defensive resource 19...Qxc4 20. cxd4 Rxb2 21. Qe1 Rb6 22. Nf3 (+0.42 @ 22 depth, Deep Fritz 15).

White almost throws away the win a move earlier with 19. Bd4?, when 19...Qxd4 would have put Black back in the fight. Instead 19. Bxg6!! (+3.59 @ 22 depth, Deep Fritz 15) is called for as it wins on the spot.

Looking for help for Black early in the opening, instead of 6...Bd7 7. dxc5 Bxc5 8. 0-0 = to (+0.33 @ 35 depth, Komodo 9.2), I slightly prefer 6...cxd4 7. cxd4 Bd7 = (0.00 @ 41 depth, Komodo 9.3) as in Black's win in A Melekhina vs A Zatonskih, 2014.

Jun-17-16  YouRang: I'm with <al wazir>.


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I spent a few moments considering how to use the idea Nxh7 (if ...Kxh7 then Qh5+!, exploiting the LSB's pin tactic on Pg6). However, I saw no way to make it work.

So to heck with that. Keep in simple: My Rb2 is attacked by Ra2, and exchanging rooks gains nothing. However, this Rb2 is attacking the Pb6, and so <20.Rxb6>, winning a pawn and threatening to win another at e6.

The only counterplay for black seems to be <20...e5>, moving the pawn out of take and attacking my Bd4. However, the discovered attack on the queen with <21.Rxf6 exd4> followed by the exchange of rooks <22.Rxf8+ Bxf8> seems to leave white better.


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Checking with the computer, I see that White is even better than I thought, because can now white can exploit that pin tactic after all <23.Nxh3!>, because of <23...Kxh3? 24.Qh5+ Kg7 25.Bc4!>


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A pretty two-way Q+B battery White threatens Ra2 and Qg8+, winning the Bf8 .

Jun-17-16
Premium Chessgames Member
  agb2002: White is one pawn down.

Black threatens 20... Rxb2.

The prosaic 20.Bxb6 or 20.Rxb6 doesn't seem to achieve much.

The the weak black castle and the possibility of attacking the rook on a2 and the square g6 from b1 or c2 leads to consider 20.Bxg6:

A) 20... Rxb2 21.Qh5

A.1) 21... Nxh5 22.Bxh7#.

A.2) 21... hxg6 22.Qxg6+ Kh8 23.Qh7# (the knight is pinned).

A.3) 21... Ra(b,c,d,e)8 22.Bf7+ Kg7 (22... Kf8 23.Qh6#; 22... Kh8 23.Qxh7#) 23.Qxh7+ Kf8 24.Qh6#.

A.4) 21... Be8 22.Qxh7+ (22.Bxf6 Bxg6) 22... Nxh7 23.Bxh7#.

A.5) 21... Bc5 22.Qxh7+ as in A.4 or 22.Bf7+ Rxf7 (22... Kg7(h8) 23.Qxh7#) 23.Qxf7+ Kh8 24.Qxh7#.

B) 20... hxg6 21.Qb1

B.1) 21... Rxb2 22.Qxg6+ Kh8 23.Qh7#.

B.2) 21... Kg7 22.Rxa2 followed by 23.Qxb6 + - [R+P vs B].

C) 20... h6 21.Qh5

C.1) 21... hxg5 22.Bxf6 Rxf6 (22... Bxf6 23.Qh7#) 23.Qh7+ Kf8 24.Qh8#.

C.2) 21... Nxh5 22.Bh7#.

C.3) 21... Rxb2 22.Bf7+ and mate in two.

C.4) 21... Bc5 22.Bf7+ as in C.3.

C.5) 21... Be8 22.Rxa2

C.5.a) 22... Bxg6 23.Qxg6+ Kh8 24.Qh7#.

C.5.b) 22... Nxh5 23.Bh7#.

C.5.c) 22... Qxb2 23.Qxh6 Rf7 (due to 24.Bxf6 and mate in three) 24.Bxf7+ Bxf7 25.Bxf6 Bxf6 26.Qh7+ Kf8 27.Qxf7#.

D) 20... Be8 21.Qb1

D.1) 21... Bxg6 22.Qxa2 + - [R vs B].

D.2) 21... Rxb2 23.Bxh7+ Kg7(h8) 24.Qxb2 with an extra pawn and attack.

Jun-17-16
Premium Chessgames Member
  patzer2: <YouRang> Playing it out on the computer, I arrive at the position in your last diagram above after 20. Rxb6 e5 21. Rxf6 exd4 22. Rxf8+ Bxf8 23. Nxh7! Kxh7? 24. Qh5+ Kg8 (24... Kg7 25. Qxg6+ Kh8 26. Qh7#) 25. Qxd5+ Kg7 26. Bc4 (+5.27 @ 20 depth, Deep Fritz 15).

As you note, White threatens both 27. Qg8+ King moves 28. Qxf8 and 27. Bxa2 in this position (your last diagram above).

Jun-17-16  Geronimo: <al wazir> said it just exactly how I saw it. Here's to Nimzo's "revolutionary move", namely 'if a piece is in your way, take it!' This is a fine example.
Jun-17-16  dfcx: The key realization for me was after 20.Bxg6 Rxb2? 21.Bxh7+


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If black plays 21...Kg7/h8, the black knight is pinned and white can safely play Qh5. If black plays 21...Nxh7 22.Qh5 mates too.

AFter 20.Bxg6 hxg6 21.Qc2 wins the a2 rook, with white up exchanges with B for R.


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Jun-17-16
Premium Chessgames Member
  patzer2: After 21. Bxg6!!, instead of 21...Rxb2 allowing 22. Qh5! as in the game continuation, Deep Fritz 15 indicates Black's two strongest defenses are 21...hxg6 and 21...e5.

Following 21. Bxg6!! hxg6 (diagram below)


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White wins, as <nalinw> observes in his post, with 21. Qc2 when play might continue 21...Ne4 22. Qxa2 Qb7 23. Nxe4 dxe4 24. Rb1 (+3.53 @ 23 depth, Deep Fritz 15).

Following 21. Bxg6!! e5 (diagram below)


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White mates after 21. Bxe5 Rxb2 22. Bxh7+ Kg7 23. Qh5 Be8 24. Ne6+ Kh8 25. Bg6+ Kg8 26. Qg5Bd6 27. Bxd6 Bxg6 28. Qxg6+ Kh8 29. Qh6+ Kg8 30. Qxf8+ Kh7 31. Qxf6 Rxf2 (31...Kg8 32. Qg6+ Kh8 33. Be5+ Qg7 34. Qxg7#) 32. Rxf2 Qa1+ 33. Rf1 Qxf1+ 34. Kxf1d4 35. Qg7#.

P.S.: From a practical perspective, I prefer <al wazir>'s simpler choice 21. Rxb6 . However, if not very instructive or practical for most club players, the brilliant game win with 21. Bxg6!! is certainly entertaining.

Jun-17-16  mel gibson: I reckon:
20 Rxb6

that's what I saw & it works too.
I tried it on the computer.

Black in this game does not defend well with
20...RxR.

The computer plays differently but does win
faster than my choice with the text move:
20 Bxg6

Jun-17-16
Premium Chessgames Member
  Jimfromprovidence: I have it slightly different from some others: 20 Bxg6 hxg6 21 Qb1 Ne4 22 Rxa2 Qb7 23 Nxe4 dxe4 24 Qxb6.


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Jun-17-16
Premium Chessgames Member
  kevin86: White gives up the queen with a choice; then he gives black an offer he cannot refuse!
Jun-17-16  YouRang: <patzer2> Yes, and I see that I mistyped the line (left out a move) leading up to my final position.

<23.Nxh7! Kxh7? 24.Qh5+ Kg8 <25.Qxd5+ Kg7> 26. Bc4>

Jun-17-16  Carlos0012358: 20....Rxb2 was an unfortunate move. 20....hxg6 then 21.Qb1i think would have been a better continuation, although Black is still behind the eight ball.
Jun-17-16  YouRang: <Carlos0012358: 20....Rxb2 was an unfortunate move. 20....hxg6 then 21.Qb1i think would have been a better continuation, although Black is still behind the eight ball.>

My engine has a slight preference for <20...hxg6 21.Qc2>, I think because it leaves b1 open for a later rook move (Rfb1).

But yes, black is seriously losing in any case after 20.Bxg6!

Jun-17-16  devere: After 20.Bxg6! Rxb2 21.Qh5! e5 22.Bxh7+ White forces checkmate. After 22.Bxe5 as played in the game, Black can avoid immediate mate with 22...Bf5 23.Bxf5 Bc5, although White wins easily enough with 24.Be6+ Kh8 25.Bf7


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