Black To Play And Win?

FACED my second Belgian of the tournament in round eight of the Benidorm U2000.
I won a pawn in the opening, but had to make some kingside concessions.
Later, Black had the chance to go for a combination, but is it sound?

White has just played 26.Ne5-d3 in Spanton (1940) - Dirk Voet (1820)

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The combination is 26...Bxc3?? 27.bxc3 Nxc3, but it is definitely unsound as White has 28.Qd2, eg 28...Nxd1 29.Qxg5+ Kh7 30.Ne5, when Black faces ruinous loss of material.
The game saw 26...Rhe8 27.Bb3 a5 28.Bd4!
Inviting an isolani on d4, but in return for a great outpost on e5.
28...Bxd4+ 29.cxd4 Qc6?! 30.Ne5 1-0 (35 moves)