This week's Canadian Tactic comes from the 2014 PanAms, the North American University Championship, held on South Padre Island, Texas in December. In round 1, GM Anton Kovalyov had Black against an opponent he outrated by nearly 900 points. Instead of going for complications, Anton played his slow QID (3...b6, 4...c6, 5...d5) and slowly equalized. Late in the middlegame, possibly with White in time trouble, they reached the following position:
[Event "Pan American Intercollegiate-chT"]
[Site "South Padre Island"]
[Date "2014.12.27"]
[Round "1.4"]
[White "Shepherd, Duncan"]
[Black "Kovalyov, Anton"]
[Result "0-1"]
[ECO "E09"]
[WhiteElo "1725"]
[BlackElo "2619"]
[Annotator "Upper,John"]
[PlyCount "78"]
[EventDate "2014.12.27"]
[EventType "team-swiss"]
[EventRounds "6"]
[EventCountry "USA"]
[Source "Chessbase"]
[SourceDate "2015.01.08"]
[WhiteTeam "UILL II"]
[BlackTeam "UTBR"]
[WhiteTeamCountry "USA"]
[BlackTeamCountry "USA"]
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 c6 5. Bg2 d5 6. O-O Nbd7 7. Qc2 Ba6 8. b3
Rc8 9. Nbd2 c5 10. Bb2 Be7 11. Rac1 O-O 12. Rfd1 Bb7 13. Qb1 dxc4 14. Nxc4 b5
15. Nce5 Be4 16. Qa1 Nxe5 17. Nxe5 Bxg2 18. Kxg2 Qb6 19. dxc5 Bxc5 20. Nd3 Be7
21. Bd4 Qb7+ 22. Kg1 h5 23. Nf4 h4 24. f3 Rcd8 25. Kf2 Rd7 26. g4 Rfd8 27. g5 {
Diagram [#]} Ne4+ $5 28. fxe4 $8 {Of course. Everything else just loses the g5
pawn for free, or worse.} Qxe4 (28... Bxg5 $2 29. Rg1 $1) 29. e3 $2 (29. Be3 $8
Bc5 (29... Bxg5 $2 30. Rxd7 (30. Ng2 $2 Bxe3+ 31. Nxe3 Qf4+ $19) 30... Rxd7 31.
Qb1 $8 Qe5 32. Kf3 $1 $16 {Black has two pawns for the piece, but White has
consolidated,} Rd4 {would be great, but White has} 33. Rc8+ $8 {forcing Black
back.}) (29... Bd6 $6 30. Rxd6 $1 Rxd6 31. Qb1 {Black has some comp, but
there's no clear way to win more, though even a 2800 would have trouble
finding this whole line over-the-board:} Qe5 $140 32. Rc5 $1 Rd5 $8 33. Qd3 $3
$16 (33. Nxd5 $2 Qxh2+ $11) 33... Rxc5 34. Qxd8+ Kh7 35. g6+ $1 (35. Bxc5 $2
Qxf4+ $11) 35... fxg6 36. Qxh4+ Kg8 37. Bxc5 $18) 30. Bxc5 $8 (30. Rxc5 Rxd1
$19) 30... Qxf4+ 31. Ke1 $8 (31. Kg2 $2 Rd2 $1 $18) 31... Qxh2 32. Rxd7 $8 (32.
e3 Rd2 $19) 32... Qh1+ 33. Kf2 Qh2+ 34. Ke1 $1 Rxd7 $13 {Black has two pawns,
an exposed White King to harass, and a threatening passed h-pawn, but White is
surviving.}) 29... Bxg5 (29... e5 $1 $19 30. Bxe5 Rxd1 31. Rxd1 Qc2+ $1 32. Ke1
Bb4+ $19) 30. Rg1 (30. Qb1 Qxb1 31. Rxb1 Bxf4 {Black gets the piece back with
a winning Rook ending.}) 30... f6 {good enough, and maybe a bit sadistic.} (
30... Bxf4 $1 31. Rxg7+ Kf8 $19 {is plenty good enough.}) 31. Qb1 Rxd4 $1 32.
Qxe4 Rxe4 33. Kf3 Re5 $1 34. Rc7 a5 35. e4 Kh7 36. Ra7 Kh6 37. Rxa5 Bxf4 38.
Kxf4 Rd3 {the mating net will cost White his Rg1.} 39. Rf1 g5+ 0-1