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Yu Yangyi vs Wesley So
FIDE Chess.com Online Nations Cup (2020) (rapid), chess.com INT, rd 11, May-10
Queen's Gambit Declined: Ragozin Defense (D38)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
May-10-20
Premium Chessgames Member
  An Englishman: Good Afternoon: Felt so fascinated by how White persuaded Black to completely undevelop the Queen side by move 21, never noticed the impending King side onslaught.

Tough sacrifice to analyze for an amateur without a silicon monster. White had to have answers to 27...Rf8, 27...Re6, and 27...Rd6. What are they?

Just my imagination, or is this truly a brilliant game?

May-10-20
Premium Chessgames Member
  Bobby Spassky: 1) =0.00 (18 ply) 27...Re6 28.Bf1 e4 29.Kg2 Qb7 30.Be2 Qb5 31.Rh1+ Kg8 32.g6 Qxc4 33.Bxc4 Na6 34.Rhd1 Kf8 35.Rh1 Kg8

Wesley blew it on move 27.

May-10-20
Premium Chessgames Member
  Bobby Spassky: 1) +1.72 (20 ply) 28.Bd5 f4 29.Bf7 Rxg5 30.Kg2 Bh3+ 31.Kxh3 Qc8+ 32.Kg2 g6 33.Bc5 f3+ 34.Kxf3 Bxc5 35.Qh4+ Kg7 36.Qxg5 Kxf7 37.Qxe5 Qf5+ 38.Qxf5+ gxf5 39.Rd8 Ke7 40.Rc8 Bd6 41.Rh8 Bc7 42.Rb1 Be5 43.Rb7+ Kf6 44.Rf8+ Kg6 45.Rg8+ Kh6
May-10-20
Premium Chessgames Member
  saffuna: So might have considered developing his queenside pieces.
May-10-20
Premium Chessgames Member
  wordfunph: developed vs undeveloped

1-0

May-10-20  ndg2: More than one of Wesley's losses can be attributed to strange undevelopment moves. I remember some games against Aronian and I think Caru. He seems to be prone to that.
May-11-20
Premium Chessgames Member
  An Englishman: Good Evening: What happens after 27.hxg5,Re6; 27.Bd5?
May-11-20  rogl: After 27...Re6 Stockfish says that 28.g4!! is completely winning, but I doubt a human would find that with only a few minutes left.
May-11-20  MordimerChess: I have conspiracy theory, someone changed Stockfish cloud. Our silicone friend suggest losing moves twice in this game as the best moves.

I've made 100+ video analyses in last 4 months and never had problems like this. But in last two days it happens 3 times. Twice in last game.

This is my last analysis of this game:
Yu Yangyi vs Wesley So
https://youtu.be/bycvhAu6A1o

Maybe it's some anti-cheating trap for online players? :D

May-12-20  Ulhumbrus: One of the commentators - Svidler or Jan Gustafsson - suggested 10...Nc5 and the computer evaluations suggested that this would equalise for Black.

10...Nxc3 moves the knight a third time for exchange it for a knight moved once, strengthens White's centre, and cause Black's bishop to lose a tempo as well. This suggests that for one move it concedes a great deal to White.

May-12-20  Ulhumbrus: One of the commentators - Svidler or Jan Gustafsson - suggested 10...Nc5 and the computer evaluations suggested that this would equalise for Black.

10...Nxc3 moves the knight a third time for exchange it for a knight moved once, strengthens White's centre, and causes Black's bishop to lose a tempo as well. This suggests that for one move it concedes a great deal to White.

May-12-20  SChesshevsky: After 22. Qc4, appears Black's clearly on the defensive. Worried about weak c-pawn and access to his lightly guarded King via diagonals or the d-file.

Wesley looks like he tries to close some access with an active 22...f5 ...h6 ...Kh7...Rf6. But appears that idea might be too loosening and falls apart to White's N sac.

CG computer comes up with an interesting idea. 22...g5 23.Nf3 Bf5 24. Rad1 Kg7 25. Ne1 Qc8. Looking to accomplish reducing access with possibly less loosening.

Not sure if White still has some knockout break through or if he just ends up with a much better endgame that's maybe tenable for Black? Seems interesting defensive idea from CG computer though.

May-12-20
Premium Chessgames Member
  tamar: The Alpha Zero comparisons stem from White's ability to disregard material and play against the logjam of pieces

At below 24 ply, SFshowed 0.00 for 27...Re6 , but after 28 g4 Rg6 29 gxf5 Bxf5 30 Be4 Bxe4 31f4!! Bd5 32 Rh2+ Rh6 33 Rxh6+ gxh6 34 Rxd5 Nd7 35 Qd3+ Kh8 36 Rxd7 Rd8 37Qxh7+!! Is only one of the other worldly variations hidden in the position

May-13-20
Premium Chessgames Member
  tamar: Just to verify it was not just smoke and mirrors, I tried the variation where Black takes all the material 27...Re6 28 g4 f4 29 Bd5 fxe3 30 Bxe6 exd2 31 Qe4+ g6 32 Qh1+ with mate next move, two pieces down


click for larger view

May-13-20  JustAnotherMaster: Wes had written undevelop pieces by accident on the back of the scoresheet by accident....honest mistake
May-13-20  torrefan: If a piece had already left its original square but came back to it because of the necessities of the position, is it still considered "undeveloped"?
May-13-20
Premium Chessgames Member
  saffuna: <If a piece had already left its original square but came back to it because of the necessities of the position, is it still considered "undeveloped"?>

I would say yes. What matters is not where a piece has been, but where it is.

May-13-20
Premium Chessgames Member
  tamar: The Black King and Queen suffered greatly, but not from empty nest syndrome ...
May-14-20  torrefan: <I would say yes. What matters is not where a piece has been, but where it is.>

So if a white rook moves to the a1 square to checkmate the black king, would that be a checkmate delivered by an UNDEVELOPED piece?

May-14-20
Premium Chessgames Member
  saffuna: Good point.

But an unmoved rook on a1 but with the white a-pawn gone is effectively already developed.

May-15-20
Premium Chessgames Member
  jith1207: I think it's ignorant to say Black didn't develop queen-side pieces in this game, it's like looking at the box score of a game in a different sport.

But it's true that Black's decision to bring back and keep that side Knight and Bishop in their original place without getting that Rook out made that Rook undeveloped, which directly led to the back rank mate threat and a defenseless Queen.

Jun-19-20
Premium Chessgames Member
  wordfunph: "This game made me feel like a good artist who always imagines himself painting an unforgettable picture!"

- GM Yu Yangyi

Source: New In Chess Magazine 2020 #4

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