Monday’s winning 5-second tactics

“The essence of self-discipline is to do the important thing rather than the urgent thing.”
― Barry Werner
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im Sielecki, Christof
Stremavicius, Titas (2375)
30th ECC Open Bilbao 2014.9.20 Position before Black’s 17th move. Looks like a normal King’s Indian-reversed middlegame, but there is one small detail (White’s Bishop on a3) that provides Black with a tactical opportunity to win decisive material.
BLACK TO PLAY AND WIN!
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gm Najer, Evgeny
gm Sasikiran, Krishnan
30th ECC Open Bilbao 2014.9.20 Position after 28 moves of play. Black had just played 28…Nd3, attacking the Queen and also threatening a decisive check on f2 (That is, if now 29.Qa2 Nf2+ 30.Kg2 Rxh2+ with a winning attack)
WHITE TO PLAY AND WIN!
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30th ECC Open Bilbao 2014.9.20 Stremavicius, Titas–Sielecki, Christof: 17…Bxf3! 18.Bxf3 Ncd4! Decisive 19.cxd4 Nxd4 20.Qc3 Nxf3+ 21.Kg2 Nxe1+ 22.Qxe1 e4 0-1
30th ECC Open Bilbao 2014.9.20 Sasikiran, Krishnan–Najer, Evgeniy: 29.e7!! 1-0 Black can not take the Queen because of 30.Bd5+; and if 29…Nf2+ 30.QxN! QxQ 31.Bd5+ etc. Useless would be 29…Rb8 30.Qa2+Kh8 31.Rg2 and Black has no good reason to continue to play on here.