Supposing that "he" refers to the same person, sentence 1 sounds strange because you say he didn't play in the game although you also say he beat you in the game, although not easily. "He could have beaten us more easily" obviously means that he did play in the game. " If you just say, "If he had played in the game, he could have beaten us," now that is a perfect sentence.
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sb70012I want you to tell me that why they don't make a very good sense.1- " If he had played in the game, his team could have beaten us more easily."