Tuesday’s 5-second tactics

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fm Wheeler, Cameron
fm Vibbert, Sean
World Open Arlington 2014.7.6 Position after White’s 15th move. The game is nothing special for either player, and Black should probably play solidly with 15…Bd6, chasing the White Queen from her dominating post. After 16.Qa5!? Kb8 17.Nb5 Bf4+ keeps everything undercontrol. Probably White should play 16.Qe3.
INSTEAD, Black decided to throw in the intermediate :
15…g5? 16.Bg3 Bd6
WHITE TO PLAY AND WIN!
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World Open Arlington 2014.7.6 Vibbert, Sean–Wheeler, Cameron: 15…g5 ( 15…Bd6 16.Nf5 ) 16.Bg3 Bd6 17.Nf5 exf5 18.Qxf5+ Qd7 19.Qxf6 Rhe8 20.Qc3+ Qc6 21.Rxe8 Rxe8 1-0