[Event "41st Olympiad, Tromso 2014"]
[Site "Tromso NOR"]
[Date "????.??.??"]
[Round "?"]
[White "Navara, David"]
[Black "Grischuk, Alexander"]
[Result "1-0"]
[ECO "B81"]
[WhiteElo "2716"]
[BlackElo "2795"]
[Annotator "GM Lubomir Kavalek/The Huffington Post"]
[PlyCount "79"]
[EventDate "2014.08.02"]
[EventCountry "NOR"]
[WhiteTeam "Czech Republic"]
[BlackTeam "Russia"]
[WhiteTeamCountry "CZE"]
[BlackTeamCountry "RUS"]

1. Nf3 c5 2. e4 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 e6 {Breaking into
the Scheveningen Sicilian is the most popular choice.} 7. g4 h6 8. Bg2 Be7 9.
Be3 Nc6 10. f4 Nd7 11. O-O {Avoiding Be7-h4+.} Nxd4 12. Qxd4 O-O 13. Qd2 {The
queen retreats to avoid pawn punches in the center. It also creates a battery
with the bishop, aiming at a potential target: the pawn on h6.    In this
position, Alexei Shirov chose to switch the knight to h5 via e2 and g3.} (13.
Ne2 b5 14. Ng3 Bb7 15. Nh5 e5 16. Qd2 Nf6 {but after confronting the active
knight, black equalized in  Shirov-Sutovsky, Poikovsky 2014. The game was
drawn in 44 moves.}) 13... Rb8 14. Rad1 b5 15. Ne2 {The last piece that can be
attacked retreats voluntarily, reinforcing the kingside attack and leaving
black without a target on the queenside.} Qc7 16. f5 {Opening the diagonal
c1-h6.} Nf6 {Grischuk wants to have the possibility to break in the center
with d6-d5.} ({Otherwise he would have chosen} 16... Ne5 17. b3 Kh7 (17... Rd8
$6 {runs into a strong exchange sacrifice:} 18. f6 $1 Bxf6 19. Rxf6 $1 gxf6 20.
Nf4 {and the black king is vulnerable through dark-square weaknesses. White's
attack flourishes, for example:} Kf8 21. Nh5 Ke7 22. Qf2 Nd7 23. Nxf6 $1 (23.
Rf1) 23... Nxf6 24. Rf1) 18. Nf4 Rd8 19. Nh5 Bh4 20. g5 hxg5 21. Bxg5 Bxg5 22.
Qxg5 f6 23. Qh4 ({The piece sacrifice does not win:} 23. Nxf6+ gxf6 24. Qxf6
Rb7 25. Rf4 Qb6+ 26. Kh1 Rg7 27. Rg1 Kg8 28. fxe6 Re8 29. e7 Rf7 30. Qg5+ Rg7
31. Qf6 $11) 23... Kg8 24. Kh2 Rf8 (24... Qxc2 25. Qg3 $18) 25. Rf2 {with
white's edge.}) 17. Ng3 {Navara covers his pawn on e4 and Grischuk, with only
about seven minutes left on his clock, is without an obvious target. The
disadvantage is that white can't pressure the pawn on e6 and black can play 17.
..Bb7.} Re8 {Opening the square of f8 for the bishop and enticing white to
sacrifice something.} ({For example,} 17... Bb7 18. Bxh6 $5 gxh6 19. Qxh6 d5
20. Kh2 (20. Rd3 dxe4 21. Rc3 Qe5 (21... Qd6 22. g5) 22. Qg5+ Kh8 23. Qh4+ $11)
20... Bd6 21. Qg5+ {leads to a perpetual check.}) 18. Bd4 {Navara played the
provoking move after a long deliberation. An exchange sacrifice on f6 is in
the air.} ({He might have been considering} 18. fxe6 {producing a dilemma for
black:} fxe6 $6 {is weaker, because of} (18... Bxe6 $5 {the correct capture}
19. Nf5 Bxf5 20. Rxf5 Rbc8 ({After} 20... Nd7 21. e5 $5 Nxe5 22. Bd5 Bf6 23.
Bxh6 Nc4 24. Qf2 {white may claim a tiny advantage.}) 21. Bxh6 Bf8 $1 {dwarfs
the attack.}) 19. Bxh6 $1 gxh6 20. Qxh6 {and white has a winning attack, for
example} Bd8 (20... Nh7 21. Qg6+ Kh8 22. Rf7 $18) 21. e5 $1 dxe5 22. Nh5 Rb7 (
22... Nxh5 23. Qg6+ Ng7 24. Be4 $18) 23. Rxd8 $1 {wins.}) ({After the
immediate sacrifice} 18. Bxh6 gxh6 19. Qxh6 {black succeeds to cover the dark
squares with} Nh7 20. Nh5 Bf8 {with the edge.}) 18... e5 ({White's last move
was not just a teaser, forcing to close the center, it threatens to crack open
the doors to the black king via the square f6, for example} 18... b4 19. fxe6
Bxe6 20. Bxf6 Bxf6 21. Rxf6 gxf6 22. Nh5 Qc5+ 23. Kh1 Qg5 24. Qd4 {with a
strong pressure.}) ({But the exchange sacrifice is less effective after} 18...
Bb7 19. fxe6 fxe6 20. Rxf6 Bxf6 $5 (20... gxf6 $6 21. Qxh6 Bf8 22. Qxf6 Bg7 23.
Qg6 Qf7 24. Qxf7+ Kxf7 25. Rf1+ Kg8 26. Bxg7 Kxg7 27. Nh5+ Kh8 28. Rf6 $16) 21.
Bxf6 gxf6 22. Nh5 Rf8 23. Rf1 {black defends with} Qc5+ 24. Kh1 Qg5 25. Qxd6
Rbe8 26. Qd7 Bc8 {equalizing.}) 19. Be3 Bb7 ({Black could have kept his bishop
on the diagonal c8-h3 and moved the rook from the square e8 where it would
become exposed later:} 19... Rd8 20. Bxh6 gxh6 21. Qxh6 Nh7 22. f6 Bf8 23. Qh5
Kh8 24. g5 Be6 {with a playable game.}) 20. Bxh6 $1 {A dangerous sacrifice in
opponent's time trouble.} gxh6 ({Accepting the sacrifice has been criticized
in favor of the cold-blooded} 20... d5 {and black seems to be fine, for
example:} 21. Bg5 (21. exd5 gxh6 22. Qxh6 e4 $1 23. Qg5+ (23. d6 Qb6+ 24. Kh1
Nh7 25. Qh5 Bxd6 26. g5 e3 27. g6 Bxg2+ 28. Kxg2 Qb7+ 29. Kg1 fxg6 30. Qxg6+
Kh8 31. Qxd6 e2 32. Qd4+ Kg8 33. Qg4+ Kh8 34. Qd4+ $11) 23... Kh8 24. Qh4+ Nh7
25. f6 Qb6+ 26. Kh1 Bxf6 27. Qh5 e3 28. Rde1 Re5 {and black beats the attack.})
(21. Bxg7 Kxg7 22. g5 Bc5+ 23. Kh2 Nxe4 24. Bxe4 dxe4 25. f6+ Kg6 26. Qe2 Rh8
27. Qg4 Qc8 28. Rd7 Qxd7 29. Qxd7 Bc8 30. Qc7 Bxh3 $11) 21... dxe4 22. Kh2 (22.
Bxf6 Qb6+ 23. Kh2 e3 24. Qe2 Bxf6 25. Bxb7 Rxb7 26. Ne4) 22... Red8 23. Qe2 Nd5
$11) 21. Qxh6 Nh7 ({Instead of this natural move, black could have tried a
clever defense} 21... d5 22. g5 Bf8 $5 (22... Nxe4 $2 23. Bxe4 Bf8 24. Qh4 dxe4
25. Nh5 $18) {and only after} 23. Qh4 $1 (23. Qxf6 $4 Bg7 $19) 23... Nh7 {
White can still break through:} 24. f6 $1 (24. exd5 $6 f6 (24... Qxc2 25. Be4
Qc5+ 26. Kh2 $18) 25. gxf6 Qb6+ 26. Kh2 Qxf6 27. Qg4+ Kh8 {and black survives.}
) 24... Kh8 25. exd5 e4 26. Bxe4 Rxe4 27. Nxe4 $16) 22. f6 Bf8 (22... Bxf6 23.
Rxf6 Nxf6 24. Nf5 $18) 23. Qh5 Qc5+ {Grischuk sees he can exchange the queens,
but it would not help him.} ({Instead, the computers suggest} 23... Kh8 {
although after} 24. g5 {black has no counterplay and white can quietly improve
his attack. One idea is to bring the light bishop from g2 to f5; another is to
bring the rook on h4, for example:} Bc8 25. Rf2 Rb7 (25... Qc4 26. Nf5 Bxf5 27.
exf5 $18) 26. Rdf1 Be6 27. Kh2 Qc4 28. Rf4 $3 {and white wins. It would be a 
time pressure horror.}) 24. Kh2 Qe3 25. h4 Qh6 26. Qxh6 Bxh6 {The pawn
avalanche is rolling.} 27. g5 Bf8 {Other moves do not help either:} (27... Nxg5
28. Nf5) (27... Bxg5 28. hxg5 Nxg5 29. Nf5 (29. Rf5) 29... Re6 30. Ng7 Rxf6 31.
Rxf6 Kxg7 32. Rfxd6 Rh8+ 33. Kg3 Nxe4+ 34. Bxe4 Bxe4 35. Rxa6 Bxc2 36. Rd5 {
and white should win.}) 28. g6 $1 {A tactical solution: white wins back a
piece.} Bh6 (28... fxg6 29. f7+ $18) (28... Nxf6 29. Rxf6 fxg6 30. Rxg6+ Kh7
31. h5 {black suffers on the light squares.}) 29. Nf5 $1 {A decisive leap.
Grischukâ []s game collapses like a house of cards.} Bf4+ {It doesnâ []t
matter what black plays.} ({After} 29... Bf8 30. g7 {wins.}) 30. Rxf4 $1 Nxf6 (
30... exf4 31. Nh6+ Kf8 32. g7#) 31. gxf7+ Kxf7 32. Nxd6+ Ke7 ({White also
wins after} 32... Kg6 33. h5+ Nxh5 34. Rg4+ Kf6 35. Nxe8+ Rxe8 36. Rd6+ Ke7 37.
Rh6 Nf6 38. Rg7+ Kf8 39. Rgg6 Ng8 40. Rh7 $18) 33. Nxe8 {This is a simple way
to victory.} ({The analytical engines beg for} 33. Rf5 Red8 34. Rxe5+ Kf8 35.
Bh3 $18) 33... exf4 34. Nxf6 Kxf6 35. Rd6+ Ke5 36. Rb6 $1 {A devastating pin.
Black does not have any good moves.} f3 37. Bxf3 Rf8 38. Kg3 Bxe4 39. Bxe4 Kxe4
40. Re6+ 1-0

