I think the Bots are excellent for practising classical chess. Every game is untimed, so you can play a 2hr game if you like.
What ordinary engines do, is to give you the same playing style at nominal level; only weakened by time control.
Rated Bots vs Computer play
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I like playing against the bots. at my level its mostly about spotting mistakes and taking advamtage of them, and avoiding blunders. Why arent bots good for practicing that?