Greed Doesn't Pay (Part III)

In the following position, Black can win by playing the simple 1...fxe5, remaining with a superior position and a won game. Unfortunately, he sees an "attractive" combination that wins the exchange. Without any attempt to check the soundness of the idea, Black plunges into his greedy plan. Only two moves later, he realizes that he is checkmated. Black never dreamed of how dangerous that White Knight could be. Let this be a lesson for all impatient-would-be-winners.