Solution

1… Qb2! threatens Qxc3 and overloads the white queen since 2. Qxb2 allows Rd1#

1… Qb2 2. Rc2 Qb1+ 3. Qf1 Qxb2

Or

1… Qb2 2. Rc8?! Qb1+ (not Rxc8? Qxb2 or Qxe2? Rxd8#) 3. Qf1 Qxf1 4. Kxf1 Rxb8

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