This has bugged me for a bit. If chess engines are meant to always play the best moves, then how come two chess engines playing against each other doesn’t always have the same winner?
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While chess engines are much better than the best human players, they are NOT perfect (and far from it).
Chess is a far more complex problem than any computer can solve. Engines do the best they can with limited time and memory.
To make matters worse, chess is (probably) a drawn game (but we can’t even prove that yet).
This means that any game where neither player ever plays a losing move is technically an example of a “perfect game.”
Essentially, any drawing move would be a candidate for perfect play. So even perfect chess engines would have an enormous variety of “perfect” chess games to play through.
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