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Richard Rapport vs Wei Yi
World Cup (2017) (rapid), Tbilisi GEO, rd 2, Sep-08
Queen's Gambit Declined: Capablanca - General (D30)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Sep-08-17
Premium Chessgames Member
  An Englishman: Good Morning: Funny game. White temporarily sacrifices a pawn to establish his Knight on d6--then refuses to recapture the pawn, no matter how much Black encourages him to do so! 27.Qxf6 instead of 27.Qxd5 is a quietly brilliant move. 59. White to Move will make an excellent puzzle someday.
Sep-08-17
Premium Chessgames Member
  ChessHigherCat: No Wei Yi beat the Rap!
Rapport totally outplayed chessbot in this game, so much for myths of invincibility.

The finish must be 65. Ke5 g3 66. Rg5.

This would be a draw, wouldn't it?: 65. Rg5 Bxf4 66. Rxg4 Bg5

53. Rc6 looks baffling at first but the idea must be that now white can the play Kd5 without permitting Bc3 to attack the pawns.

Sep-08-17
Premium Chessgames Member
  beatgiant: <ChessHigherCat> You are right, 65. Rg5? only draws after Bxf4.

65. Ke5 with your line or with 65. Ke5 Bg2+ 66. Ke4 wins the g-pawn and the game. According to tablebase, 65. Rf8 wins even a few moves faster.

Sep-08-17
Premium Chessgames Member
  ChessHigherCat: <beatgiant> Thanks! Can you recommend a good tablebase link for me? I googled "tablebase" and found this one http://www.k4it.de/index.php?lang=e..., but I find it extremely "user-hostile".

First of all, the instructions are sketchy to say the least, secondly, the drag-and-drop function for the pieces doesn't work, and thirdly I had to look up "FEN" on Wiki and sort of understood but I'm anything but an expert in that, so I would much prefer using "drag and drop" if that's available on some other tablebase site.

Sep-09-17
Premium Chessgames Member
  An Englishman: Good Evening: "No Wei Yi beat the Rap" is quite the inspired pun!
Sep-09-17
Premium Chessgames Member
  FSR: I understand that 59.g4!! is the thematic breakthrough in this kind of ending.
Sep-09-17  ex0duz: Is 60. Kh7 drawing, or is this endgame(3p+R vs 3p+B connected on edge of board) still losing due to that 'thematic breakthrough'?

When was the last mistake from Wei Yi, or when did Wei Yi give away the last chance to draw? Was it 60.Kg7, or was it earlier than that? I don't trust the chessbomb engine on this endgame even if it implies it's drawn..

Props to Rapport, well played and good finish. Looks like Wei Yi should have held this, but he didn't have enough time it seems(he had like 5 seconds left by end of game according to chessbomb)

Sep-09-17  optimuswise: Great endgame by Rapport!
Sep-09-17
Premium Chessgames Member
  HeMateMe: <FSR: I understand that 59.g4!! is the thematic breakthrough in this kind of ending.>

yes, it's tricky, something to remember. black's fortress quickly falls apart.

Sep-09-17
Premium Chessgames Member
  beatgiant: <ChessHigherCat> User-friendly online tablebase server: http://chessok.com/?page_id=361
Sep-09-17
Premium Chessgames Member
  beatgiant: <ex0duz>
After 60...Kh7 61. Rd7+ Bg7 61. hxg6+ Kxg6 <62. Rf7> followed by 63. Rxf5 leads to a tablebase win.
Sep-09-17
Premium Chessgames Member
  ChessHigherCat: <beatgiant: <ChessHigherCat> User-friendly online tablebase server: http://chessok.com/?page_id=361>

Thanks again! So does that mean that it's possible to cheat (oneself) now on any puzzle involving 6 pieces or less?

Sep-09-17  7he5haman: What about 63...Kh5 intending Kh4 to support the pawn?
Sep-09-17  Nerwal: <What about 63...Kh5 intending Kh4 to support the pawn?>

Black loses the g pawn by force after something like 64. ♔xf5 ♔h4 65. ♖b7 ♗d4 (otherwise ♖b6-h6+-g6 wins the g pawn) 66. ♖d7.

Sep-09-17  cro777: Instructive endgame.

A textbook rook vs bishop endgame with three pawns on the kingside appeared after 41.Rxa4. As a rule, in this type of endgames a fortress cannot be built.

The same endgame, with the pawn formation f4-g3-h4 vs f5-g6-h5, had appeared in the game N Radev vs Pribyl, 1971 at the Goglidze Memorial in Tbilisi. This endgame is discussed at length in Dvoretsky’s "Engame Manual".

Radev – Pribyl. Position after 47…Bb2


click for larger view

48. Kc4 Kf8 49. Kd5 Kg8 50. Ke6 Bc3 51. Rd3! Bb2 52. g4!!


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The winning idea, the g4 break, was already shown in Tbilisi 46 years ago!

Sep-09-17  cro777: Rapport showed great endgame technique.

Position after 41.Rxa4


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"This position is theoretically won." (IM Marco Baldauf)

Generally, in rook vs bishop endgames with three pawns on the same wing, salvation is possible only in exceptional cases – when the pawn structure of the stronger side has flaws.

41.Rxa4 Bc5 42.Kg2 Bb6 43.Ra2 Bd4 44.Kf3 f5 45.Rd2 Be5 46.Rd5 Kf6 47.Ra5 Ke6 48.Ra6+ Kf7 49.Ke3 Bc3 50.f4 Bf6 51.Kd3 Bb2 52.Kc4 Bf6 53.Rc6 Bb2 54.Kd5 Kg7 55.Ke6 Bd4


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56.Rc7+! <Rapport had to know the only winning plan starting with this move>

56...Kg8 57.Rd7 Bc3 58.Rd3 Bb2 59.g4!


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59…hxg4 <According to Dvoretsky a tougher method of defence was 59... fxg4>

With just some minutes on the clock, Rapport demonstrated the only winning plan.

http://en.chessbase.com/post/rappor...

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