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Sasa Martinovic vs Luis Neves Da Silva
European Team Championship (2017), Hersonissos GRE, rd 1, Oct-28
Queen's Gambit Declined: Exchange. Positional Variation (D35)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Dec-05-19  BxChess: I went 29. Na6 bxa6 30. Nc6+ Kb7 31. Rb3+ Nb6 32 Qc5. This is good enough for the win, but not quite so neat as the more immediate game line 31. Qc5
Dec-05-19  dumbgai: It turns out putting your king on a8 and queen on b8 is not a winning strategy.
Dec-05-19
Premium Chessgames Member
  agb2002: Black threatens Nxb5.

White can start an attack against the black king with 29.Na6 bxa6 (29... Ne4 30.Nac7+ wins decisive material) 30.Nc7+ Kb7 31.Qc5:

A) 31... Ne7 32.Rb3+ Nb5 (32... Kc8 33.Rxb8+ Kxb8 34.Nxa6+ wins decisive material) 33.Rxb5+ axb5 34.Qxb5+ Kc8 35.Nxa6+ and mate in two.

B) 31... Nb6 32.Qc6+ Kc8 33.Nxa6+ Qc7 34.Qxc7#.

Dec-05-19  Walter Glattke: 31.-Ncb6 32.Qc6+ Kc8 33.Nxa6+
Dec-05-19  JohnBoy: And complementary to <Glattke>'s line, 31...Ne7 32.Rb3 Nb5 33.Rxb5+ also finishes the game.
Dec-05-19
Premium Chessgames Member
  malt: Gone with 29.Na6 ba6 30.Nc7+ Kb7 31.Qc5
(31.Rb3+ Nb5 32.Qc5 Rd6 33.a4 )

31...Ne7 32.Rb3+ Nb5 33.R:b5+! ab5 34.Q:b5+ Kc8 35.Ne6+

and the end is nigh.

Dec-05-19  TheaN: I have a struck of blindness here, actually considering 31.Rb3+ <#2>: missing the Nc8 intervention at all, and after 31....Nb5 32.Rxb5+? (thought it was mate) not considering a6.

Typically SF considers it the best move after 31....Nb6 32.Qc5 +- or 31....Nb5 32.d6!, if 32....Rxd6 33.Qf3+ Kb6 34.Na8+! +-. 31.Qc5 is simpler and the key idea.

30.Na6 is relatively obvious though.

Dec-05-19  5hrsolver: I got it but for some reason I found 31.Qc5 hard to find.
Dec-05-19  Carrots and Pizza: This one is kind of tricky because, although the first two moves are easy to find, assuming you are checking forcing moves, 31.Qc5 is not obvious at first, at least to me.

I noticed that the black queen was almost trapped, so 29.Na6 is an obvious first choice. Black capture with ...ba. Then 30.Nc7+ Kb7.

At this point I tried to make 31.Rb3+ work but it doesn't. I almost gave up, noticing 31.Qc5 (because of the the weak c6 square) at the last moment. I'm not sure I would have sacced the knight in a tournament game unless I completely worked out what comes after Qc5.

Dec-09-19
Premium Chessgames Member
  patzer2: For the Thursday, Dec 5, 2019 puzzle solution, 29...Na6! 30. bxa6 Nc7+ 31. Kb7 Qc5! -+ rips open the weakened castled position for a winning attack.

P.S.: Black's game starts to go bad with 17. Bf5?! Bxf5 ⩱ to ∓, trading off a piece needed for the defense of the kingside castled position.

Instead, 17...Bc8 = (0.00 @ 36 ply, Stockfish 10) or 17...Rhe8 = (0.00 @ 36 ply, Stockfish 10) keep the position level.

Black's decisive mistake appears to be 27...Nc8? 28. Rc1 +- (+6.74 @ 30 ply, Stockfish 10).

Necessary instead is 27...Nd6 28. Nxa7! Nbc4 29. Nxb7! Qxa7 30. Qxa7+ Kxa7 ± (+1.22 @ 35 ply, Stockfish 10) with practical drawing chances.

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