Solution
1… Bxc3 2. Bxc3 (or Qxc3) Rxa4 wins a piece
1… Bxc3 captures the defender of the a4-Rook and is at the same time a tempo-move since black is threatening Bxd2.
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1… Bxc3 2. Bxc3 (or Qxc3) Rxa4 wins a piece
1… Bxc3 captures the defender of the a4-Rook and is at the same time a tempo-move since black is threatening Bxd2.