Anand and the Exchange Sacrifice

In Stavanger there are no boring games. Even the draws are agreed after complete and thorough battle:
A game that I liked (ChessBase 13)

[Event "Norway Chess"]
[Site "?"]
[Date "2015.06.17"]
[Round "2.2"]
[White "Giri, Anish"]
[Black "Anand, Viswanathan"]
[Result "1/2-1/2"]
[WhiteElo "2773"]
[BlackElo "2804"]
[Annotator "Bojkov, Dejan"]
[PlyCount "105"]
[EventDate "2015.??.??"]
[WhiteClock "0:46:51"]
[BlackClock "0:53:05"]

1. c4 Nf6 2. Nf3 e6 3. g3 d5 4. Bg2 Be7 5. O-O O-O 6. b3 {Diagram [#] Despite
his convincing blitz win in the Italian game, Giri decided to choose the quiet
Reti.} c5 7. Bb2 Nc6 8. e3 b6 9. Nc3 Ba6 {The second main move in the position
but one that scores better than its "bigger brother". Black usually chooses} (
9... Bb7 10. cxd5 Nxd5 (10... exd5 {is also possible}) 11. Nxd5 Qxd5 12. d4)
10. Qe2 {This is also the second main line. White usually chooses} (10. d3 Rc8
11. Qe2 {For example} Qc7 12. Ne1 (12. Rac1 {Paunovic,D (2506)-Sanchez Juncal,
B (2206) Mondariz 2006}) 12... Qd7 13. Nc2 Nb4 14. e4 {with complex play,
Eljanov,P (2702)-Roiz,M (2617) Legnica 2013}) 10... Qd7 {Diagram [#] Anand
proceeds easily with his development and connects the rooks. We can see the
point behind the Ba6 move- White cannot trade on d5 easily and modify the pawn
structure in his favor by creating hanging pawns in the black camp later.} 11.
Rfd1 Rac8 12. Nb5 {Prepares the d2-d4 advance.} Rfd8 13. Rac1 {But here the
Dutch GM prolonged the preparation one move too many. In case of} (13. d4 {
Anand planned} cxd4 14. exd4 Qe8 {This was a better try for White's advantage
though, say after} 15. Ne5) 13... dxc4 {Anand seizes his chance to occupy the
outpost on d3.} 14. bxc4 Qd3 15. Qxd3 $146 {Diagram [#] The novelty.} ({The
only predecessor saw:} 15. Bf1 {which should hardly yield White any advantage-}
Qxe2 16. Bxe2 Ne8 (16... Bb7 $5 $11) 17. Ne5 Nxe5 18. Bxe5 Rd7 (18... Bb7 $5)
19. a4 Rcd8 20. d3 {McNab,C (2420)-Thomson,C (2260) Edinburgh 1985}) 15... Rxd3
16. Bf1 ({At first Giri intended} 16. Ne5 {but then he realized that there is
not enough time to kick the rook back from it's active position} Nxe5 17. Bxe5
Rcd8 18. Rc2 Bxb5 19. cxb5 Nd5 20. Bf1 Ra3 {and "this is not very good" (Giri).
}) ({Perhaps White can fight for an advantage with} 16. a4 {as now} Rcd8 $2 {
loses material to} ({Also bad is} 16... Nb4 $6 17. Ne5 $16) 17. Ne1 Rxd2 18.
Rxd2 Rxd2 19. Bc3 $18) 16... Rd7 17. d4 Rcd8 $11 {[%csl Yd4] Diagram [#] Black
comfortably levelled the chances.} 18. a4 Bb7 $5 {An interesting approach by
the Indian GM. Instead of waiting passively he sacrifices the exchange for a
pawn and queenside passers.} ({Both} 18... Ne4 19. d5 Bf6 20. Bxf6 gxf6 $1 21.
Nd2 Nxd2 22. Rxd2 Ne5 $11) ({And even simpler} 18... cxd4 19. exd4 Ne4 {with
the idea Be7-f6 seemed perfectly comfortable for Black.}) 19. d5 exd5 ({Of
course not} 19... Nb4 $2 20. Ne5) 20. Bh3 dxc4 21. Bxd7 Nxd7 22. Nd6 Ba6 23.
Nxc4 f6 $1 {[%csl Yb2,Rf6,Rg7] Diagram [#] The point behind Anand's sacrifice.
He kills the bishop on b2 and intends to slowly advance on the queenside.} 24.
Rd2 {Giri self-criticized himself upon that move and suggested instead} (24. e4
$5 Bxc4 25. Rxc4 a6 26. Rc2 b5 27. axb5 axb5 {when in comparison to the game
he has an extra move e3-e4 and possibility to maneuver with his knight via the
d2 square. Indeed, here} 28. Nh4 {looks good for White with the idea} g6 29.
Rcd2 Nb6 30. Rxd8+ Nxd8 31. Bxf6 $1 Bxf6 32. Rd6 $16) 24... Bxc4 25. Rxc4 a6
26. Rc1 b5 27. axb5 axb5 28. Ba3 {Giri did not like the look of} (28. Rcd1 Nb6
29. Rxd8+ Nxd8 30. Nd2 Nc6 {"I am jealous at Black's position," although White
can always trade a light piece for the black queenside pawns and force a draw.}
) (28. Ra1 $5) 28... Kf7 29. Rxd7 $6 {Diagram [#] White decided to force a
draw but confused the move order.} ({"The easiest was"} 29. Bxc5 Nxc5 30. Rxd8
Nxd8 31. Rb1 $11 {(Anand)}) 29... Rxd7 30. Bxc5 Ne5 $1 {Missed by Giri "now I
have to suffer".} 31. Nxe5+ fxe5 32. Bxe7 Kxe7 {The outside passer provides
Black serious winning chances. White's problem is that he can never trade the
rooks as the resulting endgames are lost for him.} 33. Kf1 Kd6 34. Ke2 e4 35.
Rc8 $1 {[%csl Gc8][%cal Gc8b8,Gc8e8,Ge8e4] Diagram [#] Active rook is the
mantra of the rook endgames.} ({After} 35. f3 exf3+ 36. Kxf3 b4 37. Ke4 Rb7 38.
Kd4 b3 {White should fall into zugzwang soon.}) 35... Ra7 {A more serious
chance would have been} (35... Rc7 $5 {Both players analyzed the position in
the press conference and came to the conclusion that it should have ended in a
draw, but in far more difficult way than in the game:} 36. Rd8+ ({Or} 36. Rb8
Kc5 37. Kd2 Kb4) 36... Kc5 37. Rd4 b4 38. Rxe4 Rd7 ({Anand saw the nice line}
38... b3 39. Kd3 b2 40. Rc4+ Kb5 41. Rxc7 b1=Q+ 42. Ke2 {followed by h2-h4 and
rook transfer to d4 which will be a fortress.}) 39. Re8 b3 40. Rb8 Kc4 41. e4
Kc3 42. Rc8+ $1 {To force the king in front of the pawn and win some tempos}
Kb2 43. e5 Kb1 {when Black can win the rook, but White will have sufficient
counterplay after say} 44. Rb8 b2 45. Ke3 Ra7 46. Ke4 Ka2 47. Kd5 b1=Q 48. Rxb1
Kxb1 49. e6 Kc2 50. Kd6 $11) 36. Kd2 Ra2+ 37. Kc3 Rxf2 38. Rb8 Rxh2 ({The pawn
cannot be saved} 38... Kc6 39. Rc8+ Kb6 40. Rb8+) 39. Rxb5 Ke6 40. Kd4 Rg2 41.
Kxe4 Rxg3 42. Kf4 {Diagram [#] The White pieces are maximally activated. He
needs to trade any of the black pawns to achieve theoretically draw position.}
Rg1 43. Rb6+ Kf7 44. e4 h5 45. Rb7+ Ke6 46. Rb6+ Kd7 47. Kf5 Kc7 48. Rb2 Kd7
49. e5 Rf1+ 50. Kg5 Ke6 51. Kxh5 Kxe5 52. Kg4 g5 53. Kxg5 1/2-1/2


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