Victorian Championships 2013/Puzzle 01

As I write this, the Victorian Championships is wrapping up with the last round at Box Hill Chess Club. Bobby produced another dominant performance we have come to expect of him, winning with a round to spare while only Ari managed to stay on the board. His play was characterized by an apparent ease and simplicity in disposing of his relatively tough opposition. See if you can match Bobby's tactical ability and complete his victory over the dangerous Dusan Stojic.

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Full results can be found at http://www.chessvictoria.org.au/open-tournaments/the-2013-victorian-championship-and-reserves/2013vicchamps