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Alexander Onischuk vs Kayden Troff
US Championship (2015), St Louis, MO USA, rd 3, Apr-03
Gruenfeld Defense: Exchange. Modern Exchange Variation (D85)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Apr-05-15
Premium Chessgames Member
  whiteshark: "A game that is extremely difficult to understand. Onischuk popped an absolutely beautiful tactic (<19.Nd4!!>) and obtained a crushing position.

His passed pawn on d7 gave him an easily winning advantage. Black was crushed, basically in a resignable position. White had several ways of winning, both trying to push the pawn to d8 ripping apart the blockade. Also perfectly possible was to go after the weakened black king and try to checkmate it, but Onischuk managed to do neither.

Troff pulled a complete miracle and somehow survived after perhaps one of Onischuk's worst games in the last many years."

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Apr-05-15  ketchuplover: 26.Qd6+ looks good to me
Feb-03-23
Premium Chessgames Member
  waddayaplay: It's not that easy. According to Stockfish, 26.Qd6 is a draw. I didn't analyze it deeper but suppose Kf7, then what? Back rank mates will always be a threat. E.g. ... Kf7, Rc8, then there is Rb1 with the threat of .. Qe1+. If h3 then Ke7 seems to hold.

Stockfish does show that on move 27 white had Qe3, threatening Qxe6. And if Qb6 them Qe4!, With the threat of Re6 that can't be prevented. But it's not an intuitive line to find with so many options.

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