This week's Canadian Tactic comes from the 2015 DC International. Going into the second last round, Canadian GM Anton Kovalyov and Iranian GM Ehsan Maghami were tied for the lead with 5.5/7. In the game, Black built up a menacing kingside attack, but White evacuated his King and forced off the Queens to leave the position in the diagram. White to move.
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[Event "Arlington DC op 3rd"]
[Site "Arlington"]
[Date "2015.06.29"]
[Round "8"]
[White "Ghaem Maghami, Ehsan"]
[Black "Kovalyov, Anton"]
[Result "1-0"]
[ECO "A28"]
[WhiteElo "2562"]
[BlackElo "2613"]
[Annotator "John Upper"]
[SetUp "1"]
[FEN "1rb5/p1p2pk1/1pBp4/5PB1/2PPp1n1/P1P5/3K1P2/7R w - - 0 28"]
[PlyCount "3"]
[EventDate "2015.06.25"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[Source "CFC"]
[SourceDate "2015.07.15"]
28. Bxe4 {Only move.} (28. Rg1 $2 Bxf5 $11 29. f3 (29. Bxe4 Bxe4 30. Rxg4 Bg6 $11) 29...
exf3 30. Bxf3 Nf6 {White has no useful discovered checks.}) 28... f6 ({The key
line is:} 28... Nxf2 29. f6+ {Only move.} Kg8 30. Bh7+ {Only move.} Kf8 31. Rh4 $18 {and Black has no way to save the N; e.g.} Ng4 32. Bf5 {threatens mate and the N.}) 29. Bh4 {
White's R and Bs will cut Black apart after Rg1.} 1-0
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