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Yu Yangyi vs Wen Yang
Chinese Chess League (2017), China CHN, rd 20, Dec-03
Semi-Slav Defense: Anti-Moscow Gambit (D44)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Apr-03-19  ChessHigherCat: This leads to a measly one-point advantage for white but there must be better:

35. Nc6+ Qe6 36. Nxd8 Kxd8 37. Qxe6 fxe6


click for larger view

Apr-03-19  ChessHigherCat: preceded by 34. Rxd5 Qxd5 as in the first variant
Apr-03-19
Premium Chessgames Member
  agb2002: White has a rook for a bishop and a pawn.

Black threatens N(Q)xe5.

White can win more material with 34.Rxd5 Qxd5 35.Nxc4+ Qe6 (35... Ne5 36.Nxe5 + - [N]) 36.Nd6+ Ke7 37.Nf5+ Kf6 (37... Ke8 38.Ng7+ Ke7 39.Nxe6 wins) 38.Qg5+ Ke5 39.Nd4+ Kd6 40.Nxe6 wins.

The alternative 34.Qg5 looked attractive (34... N(Q)xe5 35.Rxf8+ seems to win decisive material) but 34... Nf6 puts some resistance.

Apr-03-19  nalinw: I went with

35. Ng6+

35. ... Qe6
36. Rxf8 mate

35. ... Ne5
36. Rxf8+ Kd7
37. Nxe5+ followed by
38. Rxd8 ...

Apr-03-19  nalinw: **&^%%

A mirage .... Nxf8 takes care of everything

Apr-03-19  Walter Glattke: I think, 34.Rxd5 Qxd5 35.Nxd7 not 35.-Qe6, but 35.-Kxd7, Looking for a forward Knight move after 34.Rxd5 Qxd5 there is no one, a refined manoeuvre after 35.Nxc4+ brings 35.-Qe6 36.Nd6+ Ke7 37.Nf5+ Ke8 38.Ng7+ and NxQ. 37.-Kf6 38.Qg5+ Ke5 39.Nd4+ (or Ng7+) and NxQ next.If not 34.Rxd5, e.g. Ng6/Nxd7 Nxc4, then 34.-Qxe3+. Nalinw: 36.Ng6+ Qe6 37.Rxf8 Nd7xf8! black advantage.
Apr-03-19  saturn2: I saw 34. Rxd5 Qxd5

and the series of checks

35. Nxc4+ Qe6 36. Nd6+ Ke7 37. Nf5+ Kf6 38. Qg5+ Ke5 39. Nd4+ winning the queen.

Apr-03-19  stacase: Discovered check is nearly always a killer move.
Apr-03-19  Cheapo by the Dozen: I whiffed by imagining that the sacrificed rook would still be around to pin the d7 knight after Nc6+/Nxd8. Oops!!
Apr-03-19  ChessHigherCat: You can't sac your rook and have it, too.

Or as they say in Chinese:

Wen yu yin, yu yin

but wen yi yangyi yang

Apr-03-19
Premium Chessgames Member
  agb2002: Although, according to Stockfish, 34.Qg5 (to increase the pressure on the black pieces) 34... Nf6 35.Rh8 evaluates at about +3, it is far inferior to 34.Rxd5, at about +10.
Apr-03-19  messachess: Clever.
Apr-03-19  schachfuchs: Nice puzzle! I only calculated
34.Rxd5 Qxd5 35.Nxc4+ Qe6 36.Nd6+ Ke7 37.Nf5+ Kf6 38.Qg5+ Ke5 with another discovered check (anywhere) and thought this must be it. Hope that counts?! ;-)
Apr-03-19  DrGridlock: It's somewhat easy to find the first move of the combination, 34 Rxd5. Then after black's 34 ... Qxd5 there is going to come a discovered check from after White moves his knight on e5 out of the way of his queen on e3. But which discovered check to take? I was satisfied with:

35 Nc6+ Qe6
36 Qxe6 fxe6
37 Nxd8 Kxd8

Yu Yangyi - Wen Yang


click for larger view

With what is probably enough of an advantage for White to win. The "Wednesday-ness" of the puzzle comes in finding that if the knight takes the pawn on c4 in uncovering the discovered check on move 35, White picks up some extra material from the c6 knight move.

Apr-03-19  TheaN: Oh damn I went with Ng6+ too, which sadly is just -0.08 (pretty much 0, then) because the Black Knight defends everything.

Interesting discovered check and pin combination to hop around with a Knight by means of Nc4-d6-f5-g7 (which is the key of the combination, of course Black has illfated alternatives).

Apr-03-19  wtpy: I looked at every other discovered check before finding 35 Nc4+. Hard for a Wednesday.
Apr-03-19
Premium Chessgames Member
  wood n tempo: I got it today, although it took about 10 minutes. I realized getting the black queen off the e file was critical so the queens couldn't be traded, and a discovered check with the knight could wreak havoc. I exhausted all the other knight moves before I finally realized that 35.Nxc4+ was the one! The beautiful thing is that once the queen moves back onto the e-file she will put herself into a pin allowing the white knight to move circles around her without being touched. Therefor if 35...Qe6, she is lost to 36. Nd6+ Ke7 37. Nf5+ Kf6 38. Qg5+ Ke5 39. Nd4+. If instead, black chooses to interpose on e5, he simply loses a piece through 35.Nxc4+ Ne5 36.Qxe5+ Qxe5 37.Nxe5.
Apr-03-19
Premium Chessgames Member
  Jimfromprovidence: There is a nice variation on the main line after the point of resignation; it goes 35...Ne5 36 Nxe5 f6?!


click for larger view

Note that the knight is twice attacked and that the white rook is now en prise.

White to play and win.

Apr-03-19
Premium Chessgames Member
  agb2002: <Jim> OTB, I'd surely play 37.Ng6+ Kf7 38.Rxf8+ Rxf8 (38... Kxg6 39.Rxd8 Qxd8 40.Bxb5) 39.Nxf8 Kxf8 40.Qd4 with the triple threat Qxd5, Qxf6 and Qb4+.
Apr-03-19
Premium Chessgames Member
  Jimfromprovidence: <agb2002>. Yes, that line wins handily but how about after this (completely unforced but fun variation) below?

35...Ne5 36 Nxe5 f6?! 37 Nc6+ Kd7 38 Nxd8 Qxg8 39 Qa7+ Kxd8.


click for larger view

Apr-03-19  landshark: I stared at this forever - found no medium easy line. I'd play g4.
Apr-03-19  Andrew Chapman: Ng6+ (my choice) is met by Qe6. It's fun to see why this doesn't work against Nc4+.
Apr-03-19  SpamIAm: Diagrammed position is quite remarkable, what with the a/b/g/h files being almost completely clear of pieces/pawns, the exceptions being the black pawn at b5 and the white rook at g8. Looks almost like a sort of chess bulldozer went to work on the sides of the board.
Apr-03-19
Premium Chessgames Member
  PawnSac: I think the difficulty rating should be slightly higher, but it is quite solvable. I didn't time myself, but it took me somewhere between 5-10 minutes to find my solution. I reasoned thus:


click for larger view

white has the opportunity to create a discovered check with Rxd5, but what can he do with it? Since the Q must block the check with Qe6, white would love to play either Nc7+ or Ng7+ with a fork. But how to get there? That would take 4 knight moves. The only way he can pull that off is if one of the intermezzo knight moves is a check. So the question is, after 34. Rxd5 Qxd5


click for larger view

where can he move the knight so that his next move is a knight check? The knight can only get to d6 or f6, but the Nd7 can capture on f6, so it must head for d6
35. Nxc4+ Qe6 36. Nd6+ Ke7 37. Nf5+!


click for larger view

and now if ..Ke8 38.Ng7+ wins the Q,
and if instead ..Kf6 then
38. Qg5+ Ke5 and again 39. Ng7+ (or 39.Nd4+) also winning the Q.

Well! It does have a good solution! But this is not always the case. Anyway, when you reason thru a position in this manner and visualize the positions in steps it can make the analysis managable.

Apr-04-19
Premium Chessgames Member
  agb2002: <Jim> I see, the black queen is about to be a victim of a skewer: 40.Qb8+ Ke7 (40... Kd7 41.Bxb5+ is even simpler) 41.Qc7+ Ke6 (41... Ke8 42.Bxb5#) 42.Bc4+ bxc4 43.Qxc4+ and 44.Qxg8.
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