Today’s 5-second tactics!

“It’s funny, don’t you think, how time seems to do a lot of things? It flies, it tells, and worst of all, it runs out.”
Markus Zusak, Fighting Ruben Wolfe
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gm Kashdan,I
gm Bogoljubov,E
Stockholm, 1930. Position after 20 moves. A sharp game where the Black King finds itself in a very awkward position. Black is attacking the White Bishop. White now has an opportunity to win the game. Do you see the clever idea?
WHITE TO PLAY AND WIN!
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INSTEAD, Bogoljubov missed the idea entirely and allowed the advantage to change sides:
21.Bc2? Qf6! 22.Nd2 (forced)

BLACK TO PLAY AND WIN!
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SOLUTIONS
Stockholm 1930 Bogoljubow Efim –Kashdan Isaac: White missed 21.Qe2!! ignoring the attack on the Bishop and threatening to bring into play his final piece with Rad1. 21… cxb3 ( relatively best is 21…Bxf3 22.Qxf3 Nd7 though after 23.Bc2 Nf6 24.Nc3 Rab8 25.b3 White’s material advantage is sufficient to win ) 22.Rad1 Qc7 23.Ng5! Bc8 24.Qc4!! and Black can resign
22… Rxd2!! 23.Qxd2 Qf3! 24.Be4! Bxe4 25.Rxe4 Qxe4 26.Nc3 Qf5 and Black should win with the extra piece. The game ended on the 37th move.