Loek van Wely vs Sergei Tiviakov (2010)

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Loek van Wely vs Sergei Tiviakov
Corus Group A (2010), Wijk aan Zee NED, rd 11, Jan-29
Queen's Indian Defense: Classical. Traditional Variation (E17) · 1-0

ANALYSIS [x]

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Jan-29-10		Billy Vaughan: 81. ... Kg4? seems to lose, allowing the pawns to advance to the dark squares and close enough to the eighth rank to make Black worry. Go Loek Win Wely!

Jan-30-10		kevinatcausa: What was Tiviakov's best alternative at move 81? It seems like almost a Zugswang position, with white threatening either to break his king either through the d-file (if the rook moves off it) or move his king to f4 (if black blockades his pawn with the king) or to give check on e7 (if the rook moves off the 7th rank).

Jan-30-10		Billy Vaughan: Chessok's Rybka likes Rh7, though the analysis doesn't go far and I don't know the idea behind the move. Perhaps black can withstand the white king's breakthroughs as long as he restrains the bishop with his rook and the f-pawn with his king.

Jan-30-10		Notagm: White's pawns had to be kept on white squares, tying the King down to their defence. As soon as they were allowed to advance to black squares, the Bishop was able to defend them, allowing White's King the freedom to abandon its pawns and attack Black's b pawn.

Feb-02-10		YouRang: This game was decided when black (Tiviakov) faced this position for his 81st move [diagram:black to move] click for larger view It goes without saying that it behooves black to not allow white's connected pawns to advance successfully. Black has a few problems: [1] Black can't play 81...Kf6? because then white has 82.Kf4! with e5+ to follow. [2] Nor can black's rook leave the 7th rank (e.g. 81...Rd1?) because then white kicks the king with 82.Be7+ Kh6 83.e6 [3] A third move that black must not make is 81...Kg4? because then white has 82.f6! However, this third move <81...Kg4?> is the move he made, and to Van Wely's credit, he played the remainder of the game flawlessly and won just a few moves later. What should have black played on his 81st move? Obviously, his only other choices were to move the rook horizontally on the 7th rank, and the best seems to be: 81...Rh7 <where the R has lots of virtical and horizontal mobility, out of range of white's king or bishop or advancing pawns.> 82.Kd4 <white has little choice but to bring his king forward via the d-file> Kf6 <sealing off e5 and stopping Be7> 83.Kd5 <vacating d4 and threatening to king the K with Bd4+> Rh5! <pinning the Pf5> Now, white has a few choices, but none work. For example, 84.Kc6 <threaten black's Pb5> Rh4! <you take mine; I take yours> 85.Bd4+ Kf7 86.Kd5 <if 86.Kxb5 then Rxe4 87.Kc5 Rf4 88.f6 Rf5+ 89.Kc6 Rf4 90.Kd5 Rf5+ 91.Be5 Rf1 => 86...Rf5 <again pinning> White is kept at bay either by pinning Pf5 or threatening Pe4. In other cases, the rook goes to h1 and stops black by checking from behind, and black is able to save the draw.

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