I do like Nxd4. The pawn on c3 and the knight on f3 is pinned. If white plays Qxd then black can play Qxd4 and we have a rook and two bishops coming down hard on the king. I am sure that there is a better move...but that is my idea.
Puzzle Game # 4
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Black to play and win material. Again remember that if you are going to answer this.. you also need to give White's best move in the sequence. Again BLACK to move