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Renier Vazquez Igarza vs Wei Yi
Tradewise Gibraltar (2015), Catalan Bay GIB, rd 5, Jan-31
Gruenfeld Defense: Exchange Variation (D85)  ·  1/2-1/2

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Jan-31-15  SirRuthless: Rook and pawn endgames... What a pain in the tuchus...
Jan-31-15  Marmot PFL: Nakamura thought 46...Rf4 looked strange and thought 46...a4 was winning. That isn't so clear though, for example 46..a4 47 Kf7 Rc4 48 Kg8 h5 49 Kg7 Kb4 50 Kxg6 Kb3 51 Re2 h4 52 g4 a3 53 Kh2 a2 54 Rxa2 Kxa2 55 Kxh4 is a draw.

So 46...Rf4 cutting off the king may be better after all. 47. Kd6 a4 48. Ke5 g5 and white finds 49. h4! and if 49...Rxh4 50 g3 Rh3 51 f4 gf4 52 gf4 a3 53 f5 Kb4 54 f6 Kb3 55 Rf2 a2 56 Rf1 Rh2 57 f7 Rf2 58 Rxf2 a1(Q)+ 59 Kf5 is draw. I might have missed a lot here but it was a hard fought ending.

Jan-31-15  ex0duz: Can someone tell me if Rxh4 was undeniably winning? Like CONCRETE evidence.. where you can produce the lines leading to a clear winning position(ie it 'positional' so engines can't work out the line to the end), or you have clear cut analysis from engine/tablebases etc.

When/where do the engines change their evaluation from 1.5~ pawns to a drawn game? Straight after 49.h6 instead of 49.Rxh4? Can someone tell me if Rxh4 is a tablebase win, or is there still heaps of work that needed to be done still after Rxh4?

I don't think the positions we could get after Rxh4 is that complex to figure out.. IE even I could probably win that position lol. So i don't know why Wei Yi didn't play the 'obvious' move and instead opted for h6. Am i being a patzer and h6 is the 'easier' position to play in time trouble? Anyone know how much time he had left when he played h6?

Do you guys think that he thought 49. h6 is also completely winning and somehow less 'complicated' than the 49. Rxh4 lines? Like he didn't really need to think, and there was no chance of him losing with h6 as opposed to Rh4? I personally think Rxh4 also poses no chance for him to lose, but perhaps he thought that it would be harder to convert with less time? -shrugs-

Thanks.

Feb-01-15
Premium Chessgames Member
  cro777: <ex0duz: Can someone tell me if Rxh4 was undeniably winning? Do you guys think that he thought 49. h6 is also completely winning and somehow less 'complicated' than the 49. Rxh4 lines?>

GM Alejandro Ramirez has analyzed this position.


click for larger view

Here, 49...h6? was wrong. Wei Yi wanted to keep the pawn on g5 for the blockade.

Of course, the correct move was 49...Rxh4

49...Rxh4! 50.Kf5 h6 51.g3 Rh1 52.f4 gxf4 53.gxf4 (53.Kxf4)


click for larger view

This position is theoretically won (Black mates in 38)

(In case 53.Kxf4, Black mates in 29).

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

Feb-01-15  ex0duz: I know it's 'wrong' or rather, Rxh4 is better, but from a psycbological point of view, why do you guys think Wei Yi played h6 instead of Rxh4? Because like i said, i think Rxh4 is pretty obvious, even for a pazter like myself, so i'm 100% positive that Wei Yi saw Rxh4, but rejected it in favour of h6.

What would be the reason for not wanting a free pawn? Just to have a 'blockade'? Surely that's not worth a pawn and there's also some other reasons here(like it's easier to play, less chance of going wrong, etc etc)?

Or rather, what is the point of having a blockade? Because he thinks he could lose in the other variation(if he made a mistake)? And like i said, in this variation there is no chance whatsoever of him losing(but also less chance to win)? So basically taking all chances to lose out of the equation, while retaining small chance to win VS high chance to win but also small/medium(?) chance to lose?

Sorry if the question or point i'm trying to make is confusing, but i hope you get what i am trying to ask.. heh

Feb-01-15  SirRuthless: Perhaps Wei Yi didn't know this techincal endgame and calculation became impossible because of his clock situation so he just assumed h6 was his best try. I doubt white didn't understand this endgame. He played h4 deliberately in hopes that Yi wouldn't grab it and white got what he wanted.

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