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Wolfram Heinig vs Rainer Knaak
GDR-ch (1974), Potsdam GDR, rd 5, Feb-??
Modern Defense: Averbakh Variation (A42)  ·  0-1



Annotations by Stockfish (Computer).      [24328 more games annotated by Stockfish]

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Kibitzer's Corner
Jul-21-05  aw1988: Oh my. Another dedication to LaBourdonnais.
Premium Chessgames Member
  al wazir: A 19th-century attack from a 21st-century opening.
Dec-31-05  HannibalSchlecter: It's hard to believe white didn't have a defense there with all those moves in hand.
Jun-05-21  Walter Glattke: A) 30.-Bxf3+ 31.Kxf3 Qh5 32. Qe1 Qh1+ 33.Ke2 Qh2+ 34.Kd1 f3 35.Nxb5 ++- B) 30.-Qh5 31.exf4 Qxg4+ 32.Kf2 Bd4+ 33.Ne3 Qg3+ 34. Ke2 fxe3 35.Qf1 Qh2+ 36.Kd1/d3 Qxd2# / 36.Kf3 Qxd2 37.Nxb5 -+
Jun-05-21  mel gibson: Once again - I wasn't sure.

Stockfish 13 says:

30... Qh4

(30. .. Qh4
(♕d8-h4 f3xg4 ♕h4xg4+ ♔g2-f2 ♗g7-d4+ ♔f2-e1 ♕g4-f3 ♘f1-h2 ♗d4-f2+ ♔e1-f1 ♕f3-h1+ ♔f1xf2 ♕h1xa1 ♘h2-f3 g6-g5 ♘c3-e2 ♕a1-a2 ♗d2-c3 ♕a2-b1 e4-e5 ♕b1-e4 ♘f3-h2 d6xe5 ♘h2-g4 ♕e4-h1 ♘g4xe5 ♕h1xd5 ♘e5-g4 ♕d5-h1 ♘g4-e5 ♕h1-h2+ ♔f2-e1 ♕h2-h3 ♗c3-d4 f4-f3 ♘e5xf3 ♕h3xf3 ♔e1-d2 ♕f3-d5 ♔d2-c2 f7-f5 ♗d4-c5 ♕d5-e4+ ♔c2-d2 g5-g4 ♘e2-c1 g4-g3 ♘c1-e2 f5-f4 ♘e2-c3 ♕e4-c4 ♘c3-e2) +8.15/47 1253)

score for Black +8.15 depth 47.

Premium Chessgames Member
  An Englishman: Good Evening: Solved this one, but the real surprise comes with Black's 36th move--give the choice of taking either Queen or Knight, Knaak chose to take the Knight and remain two pieces down.
Jun-05-21  stacase: Got the first four moves but didn't see the advantage of 34...Bf2+ or anything else.
Jun-05-21  Refused: Meh.

Right idea, wrong execution.

I figured bringing the queen to the king would get the party started, but went with 30...Qg5? Which is not working, because white is apparently in time to with his counterplay and can escape 31.Qa7!!

An option white doesn't have after 30...Qh4!! as white gets killed after 31.Qa7 Bh3+!

Premium Chessgames Member
  drollere: i toyed with different ways to sacrifice the B and gain two moves for Qh4 and Qxg4+, as the Q at a1 is hanging and the back rank is a poisoned path. Bd4 could follow, possibly with check and another tempo. but the combination after the first three moves eluded me.
Jun-05-21  Brenin: I got the first four moves. After that, I relied on instinct that the Q, supported by a horde of Ps, would overwhelm the almost immobile White pieces.
Premium Chessgames Member
  agb2002: Black has a bishop and two pawns for both knights.

White threatens fxg4 and Bxf4.

Black can try to create a mating net with Qh4 and Bd4, so 30... Qh4:

A) 31.fxg4 Bd4

A.1) 32.Kf3 Qf2#.

A.2) 32.Be1 Qxg4+

A.2.a) 33.Kh2 f3 34.Ne3 (34.Ng3 Qh4#; 34.Bg3 Qh5+ 35.Bh4 Qxh4#) 34... Bxe3 35.Qf1 Qh4+ 36.Qh3 Qf2+ and mate next.

A.2.b) 33.Bg3 f3+ 34.Kh1 (34.Kh2 Qh5+ 35.Bh4 Qxh4#) 34... Qh3+ 35.B(N)h2 Qg2#.

A.2.c) 33.Ng3 f3+ and mate next.

A.3) 32.Qe1 Qxg4+ 33.Kh2 (33.Ng3 f3+ and mate next) 33... f3

A.3.a) 34.Qg3 Be5 wins decisive material.

A.3.b) 34.Ng3 Qh4#.

A.3.c) 34.Ne3 Bxe3 35.Qg3 Bg1+ (35... Qh5+ 36.Qh3 Qxh3+ 37.Kxh3 Bxd2 38.Nxb5 Bxb4 takes much longer) 36.Kxg1 (36.Qxg1 Qh4#) 36... Qxg3+ wins decisive material.

A.4) 32.Nh2 Qf2+ 33.Kh1 (33.Kh3 Qg3#) 33... Qxd2 looks winning.

A.5) 32.Bxf4 Qf2+ 33.Kh3 Qxf4 and White looks unable to avoid the loss of one of the knights.

B) 31.Bxf4 Qh3+

B.1) 32.Kg1 Qxf3, with many threats (Qxf4, Bxc3, Bh3, etc.), looks winning.

B.2) 32.Kf2 Qxf3+ 33.Kg1 (33.Ke1 Bxc3+) 33... Bxc3 is winning.

C) 31.Be1 Qh3+ 32.Kg1 (32.Kf2 Qxf3+ 33.Kg1 Bd4+ and mate soon) 32... Bd4+ 33.Bf2 Bxf3 and mate next.

D) 31.Qe1 Qh3+ is similar to C.

E) 31.Nh2 Qh3+ is winning (31.Kh1 Bxf3+ 32.Kg1 Qg2#; 31.Kg1 Bd4+ 32.Kh1 Bxf3#; 31.Kf2 Qxh2+, etc.).

Jun-05-21  malt: 30...Qh4 looks to breach, Blacks defences
31.fg4 Q:g4+ 32.Kf2

(32.Kh2 f3 33.Ng3 [33.Ne3 Be5+]...Qh4+
34.Kg1 Q:g3+ 35.Kf1 Qg2+ 36.Ke1 Qg1# )

32...Bd4+ 33.Ke1

(33.Ne3 fe3+ 34.B:e3 Qf4+ 35.Kg2 Q:e3 )

33...Qf3 34.Nh2 Bf2+ 35.Kf1 Qh1+ 36.K:f2 Q:a1 (36.Q:h2+)

Jun-05-21  Steve.Patzer: Doesn’t 36….Qxa1 win?
Jun-05-21  Socrates2: I think also that 36....Qxa1 should win more easily.
Jun-05-21  Viking707: Knaak pawned Heinig to death.
Jun-05-21  QueenMe: Agree w/ Socrates2: arriving at a check resulting in capturing the queen should have been enough. After that, Black has enough passed pawns on the right side to force white to defend using his remaining pieces, widening the material gap even further.
Premium Chessgames Member
  chrisowen: Humped it in i Qh4 goodness accommodate in i humped it low ins illicit diphthong human clans cubes quick goalie ins i rile its rew it fuv its pad on winch novelty gab jazz its low ins illicit pin dipsy addup hutch ebony feels chins its whorled its low ins illicit dio its Qh4 bite;
Jun-05-21  Tiggler: The skewer against the white Q on move 36 was enough to motivate the previous sacrifices by black, but the ending in the game was much more beautiful.
Premium Chessgames Member
  chrisowen: Hmm hmm best er o i'de play on x
Premium Chessgames Member
  Jimfromprovidence: As many have noted, black missed 36...Qxa1 which turns the game into a more tricky affair, making it into a Saturday puzzle level.

According to the provided computer annotated score, after the text 41 Ke2 the match is even.

Earlier black made a nice move that I got but I did not think much about. After 34 Nh2 here is the position.

click for larger view

Here black correctly checks with the bishop instead of the queen. If he plays 34...Qf2+ instead then after 35.Kd1 Qg1+ black can intercede with 36.Be1, below and the queen on a1 is safe.

click for larger view

Jun-05-21  olinart: I started with
. ..Bd4 31. fxg4 Qh4 32. Be1 Qxg4+ , different order than the game, but seems a better mating net around the white king.
Jun-05-21  Brenin: <ollnart>: After 30 ... Bd4 White isn't obliged to take on g4: he could defend his K, and unpin his N to attack White's b-pawn, with 31 Qe1 instead.

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