Was my chess opponent cheating?

On chess.com I was rated 800 he was rated 1000 his screen name heretokillyou123 he was playing very fast and crushing me every match. Analysis said he made a few mistakes but it seemed like an engine and maybe he was adding a few of his own moves to not get caught. I knew I had zero chance of winning. He kept... show more On chess.com I was rated 800 he was rated 1000 his screen name heretokillyou123 he was playing very fast and crushing me every match. Analysis said he made a few mistakes but it seemed like an engine and maybe he was adding a few of his own moves to not get caught. I knew I had zero chance of winning. He kept checkmating me very fast.
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