Black to move
This is an interesting position, in order for black to execute the fork, the Knights must be captured so here is how black goes about doing it.
Answer:
1.Bxc2 Qxc2
2.Rxf3 here is the tactic, black wins a piece if white tries to capture with King then
3.Kxf3?? Nxd4+
4.Nxc2 game over, black wins the Queen
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