The International was a 9-round, 26 (?) player swiss [looks like 24 players with 2 floaters to avoid forced byes], with 3 FMs, no IMs, but 5 GMs: Victor Mikhalevski (ISR), Melikset Khachiyan (USA), Aman Hambleton (CAN), GM Steven Zierk (USA), and Enrico Sevillano (USA).
Slam dunk... or "be careful what you wish for"?
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[Event "11th Calgary International"]
[Site "Calgary Chess Club"]
[Date "2018.08.19"]
[Round "2"]
[White "Mikhalevski, Victor"]
[Black "Zhao, Ian"]
[Result "1/2-1/2"]
[ECO "C54"]
[WhiteElo "2560"]
[BlackElo "1981"]
[Annotator "Upper,John"]
[PlyCount "149"]
1. e4 e5 2. Nf3 Nc6 3. Bc4
Bc5 4. d3 Nf6 5. O-O {Mikhalevski has had this position five times, but always
on the black side!?} d6 6. c3 (6. a4 a5 7. c3 Bb6 8. Bb3 Ne7 9. Be3 Bxe3 10.
fxe3 Ng6 11. Nbd2 O-O 12. Qe1 c6 13. Nh4 Nxe4 14. Nxe4 Nxh4 15. Nxd6 Qxd6 16.
Qxh4 Qxd3 17. Qg5 ({Better is} 17. Rxf7 $1 Rxf7 18. Qe7 $16) 17... Be6 18. Bxe6 fxe6
19. Qxe5 Qd5 20. Qd4 $11 {(½-½, 30) Odeev,H (2405)-Mikhalevski,V (2511)
Budapest, 2017.}) 6... h6 (6... a6 7. a4 Ba7 8. Na3 O-O 9. h3 Ne7 10. Nc2 a5
11. Be3 Ng6 12. Bxa7 Rxa7 13. Ne3 c6 {Nisipeanu,L (2686)-Mikhalevski,V (2520)
Zalakaros 2017 (½-½, 46).}) 7. Nbd2 O-O 8. b4 (8. h3 Re8 9. Re1 a5 10. Nf1
Ba7 11. Ng3 Be6 12. Bb5 Bd7 13. Ba4 Ne7 14. Bc2 Ng6 {McShane,L (2669)-Adams,M
(2706) British Ch. blitz playoff 2018 (0-1, 37)}) 8... Bb6 9. Bb3 a6 10. a4 Re8
(10... Be6 11. Bxe6 fxe6 12. Nc4 Ba7 13. Qb3 Qe8 14. Be3 Bxe3 15. Nxe3 Nh5 16.
Nh4 g5 17. Nhf5 Kh7 18. Ng3 Nf4 {Rapport,R (2707)-Safarli,E (2639) World Rapid,
Riadh 2017 (½-½, 54).}) ({Here's an interesting suggestion:} 10... d5 11.
exd5 Nxd5 12. Ne4 Re8 13. a5 Ba7 14. Bxh6 $5) 11. Nc4 Ba7 12. Re1 Be6 13. b5
Ne7 ({I'm not sure, but it looks like both players either missed or
misevaluated this:} 13... axb5 14. axb5 Bxf2+ $1 15. Kxf2 Rxa1 16. bxc6 bxc6
$15 {here Black has Rpp for the B and N, and that big clump of center pawns
will make it hard for White to find good squares for his Ns.} {Critically,} 17.
Na3 $2 {doesn't trap the Ra1, since} Rxc1 18. Qxc1 Bxb3 $19 {simply wins for
Black.}) 14. Rb1 $6 {preparing the pawn sac to come, but White is too slow to
take advantage of it.} axb5 15. axb5 Ng6 16. b6 cxb6 17. Ba4 (17. Ne3 $5) 17...
Re7 18. Bb5 (18. Be3 Bxc4 19. dxc4 Nxe4 $17) 18... Bb8 $15 19. Ncd2 (19. Ne3 d5
$1 {anyway.}) 19... d5 $1 $17 {Activating the Bb8 --- Black's much rerouted
"Lopez Bishop".} 20. c4 d4 $1 21. Nf1 Bd6 22. Ng3 Qc8 23. h3 {[#] The kind of
move I'm sure a lot of us make with a little trepedation -- in online blitz
games -- but surely there's no way Black will sac here in a tournament game
against a GM...} Bxh3 $5 {My computer rates this as a clear mistake, turning
Black's clear advantage into equality... but it doesn't have anything to say
about the psychological effect of this move.} (23... Nh7 $5) (23... Bc5 $17 {
and either way Black is up a pawn, but it is the one way back on b7.}) 24. gxh3
Qxh3 25. Qe2 Nf4 26. Qf1 (26. Bxf4 {gives Black the chance to force a draw,
and White several ways to lose quickly} exf4 27. Nf5 (27. Qf1 $4 Qg4 $19) 27...
Qg4+ 28. Kh2 (28. Kh1 $4 Ra2 $3 $19) 28... Qh5+ 29. Kg2 (29. N5h4 g5 $17) 29...
Qg4+ 30. Kf1 Qh3+ $11) 26... Qg4 (26... Qxf1+ 27. Kxf1 $1 Nxd3 28. c5 Nxc5 {only move.} (
28... Nxe1 29. cxd6 Nxf3 30. dxe7) 29. Nf5 Re6 30. Bc4 $14) 27. Nh2 Qg5 28. Kh1
g6 {Preventing Nf5 and preparing ...Qh4 and ...Ng4.} 29. Ne2 Ra2 $2 ({Both}
29... Qh5 {and}) (29... Qh4 {stopping White's 31st are good, after which White
will not be able to take on f4 without handing Black a very strong KID-style
dark-square attack.}) 30. Bxf4 exf4 {threatening ...f3-+.} 31. Qh3 $1 $16 {
Stops Black from improving his Q, and eyes c8.} Kh7 32. Ra1 Rb2 33. Ra8 $2 {
This threatens Qc8, with a winning counter attack, but Black can trade Qs and
keep an advantage with his active pieces (and extra pawns) so this turns out
to be a serious waste of time.} Qh5 $1 34. Qxh5 (34. Qc8 {looks menacing (it THREATENS MATE!!), but Black can defend with ...Re8 or
even ...g5!} Re8 35. Qxb7 {saving the Q and attacking f7.} (35. Bxe8 $2 f3 $19)
35... Re7 36. Qc8 {only move.} (36. Qxb6 Ng4 $19) 36... Re8 37. Qb7 $11) 34... Nxh5 {[#]}
35. Nxd4 $2 {Opening the c5-g1 diagonal is serious mistake, giving Black an
overwhelming attack.} ({Better is} 35. Raa1) 35... Rxf2 $2 ({Better is} 35... Bc5 $19 36.
Ndf3 (36. Nhf3 Rxf2 $19) (36. Re2 Bxd4 $19) 36... Bxf2 37. Rea1 Be3 $19) 36.
Ndf3 Rb2 (36... Bb4 37. Rd1 f5 $5 38. e5 g5 {the computer prefers Black, but
this could go either way, and the player who keeps his nerves in time trouble
will probably win.}) 37. Raa1 Ng3+ 38. Kg1 Ne2+ 39. Kf1 $2 ({Better is} 39. Rxe2 {as Mikhalevski plays later.})
39... Ng3+ ({Better is} 39... Rxe4 $3 {winning, since White can't survive if he can't
block the c5-g1 diagonal.} 40. dxe4 $2 Ng3+ 41. Kg1 Bc5+ $19 {it's #2.}) 40.
Kg1 Ne2+ 41. Rxe2 Rxe2 42. Ng4 Kg7 43. Kf1 Rb2 (43... f5 $3 {a stong computer
move: the exchange sac leaves White staring at a wall of Black pawns, and the
"Bishop" on b5 is a distant and useless spectator.} 44. Kxe2 fxg4 45. Nd2 (45.
Nd4 Be5 $19) (45. Nh2 h5 $19) 45... Bc5 $17) 44. e5 Bc5 45. d4 $1 h5 46. Nf2 (
46. Nf6 $1 Rb3 (46... Bxd4 $5 47. Nxd4 Rxe5 48. Nd5 g5 $13) 47. Kg2 Rxf3 $1 48.
Kxf3 Bxd4 $15) 46... Rb3 $1 47. Nd2 Rxb5 $1 48. cxb5 Bxd4 $17 49. Ra4 Bxe5 50.
Nh3 Re6 (50... f6 51. Nxf4 Rd7 52. Nf3 Bxf4 53. Rxf4 g5 $17) 51. Nf3 (51. Nxf4
$4 Rf6 $19) 51... Bd6 52. Rd4 f6 53. Nxf4 Bxf4 54. Rxf4 Rd6 55. Re4 Rd5 56.
Re7+ Kh6 57. Re6 Rxb5 {[#]} 58. Rxf6 $2 (58. Kg2 $1) 58... Rf5 $1 59. Rxf5 {only move.}
gxf5 {This position is winning for Black -- mate in 33, according to the
7-piece Lomonosov tablebases -- but there is no margin for error. Mikhalevski
defends perfectly, and Zhao makes one hard-to-see-but-critical error.} 60. Ke2
Kg6 61. Ke3 {If it was White to move here, then Kf4 would be a draw.} b5 $1 62.
Kf4 b4 $1 63. Nd4 Kf6 64. Nb3 b6 (64... h4 $1) 65. Nd4 h4 66. Kf3 Ke5 (66... b5
) 67. Nc6+ Kd5 68. Nxb4+ Kc4 $2 (68... Kc5 {only move.} 69. Nc2 (69. Nd3+ Kd4 {only move.} $19)
69... b5 70. Ne3 {wins the f-pawn, but doesn't gain a tempo on the K.} b4 71.
Nd1 (71. Nxf5 b3 $19) 71... Kd4 72. Kg2 f4 $19) 69. Nc2 $11 (69. Nc6 $11 Kc5
70. Ne7 {only move.} b5 71. Nxf5 {only move.} b4 72. Ne3 {only move.} $11) 69... b5 70. Ne3+ {only move.} Kd3 71. Nxf5
b4 72. Ne3 h3 73. Nd1 {only move.} Kc2 74. Ne3+ {only move.} Kd2 75. Nc4+ {The N on its own can
stop/sacrifice itself for the b-pawn while the white K catches the h-pawn.}
1/2-1/2
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