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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There are moments when several moves may have the same evaluated value. So the chess engine chooses one of them, having judged them as equal. This may happen a lot and with either engine, so it is possible to play the same game over and over again, but the engines are programmed no to be predictable either.
ie; if a certain setup always caused a chess engine to make a specific move, it would make it predictable and more easily defeated, so some randomness is added when more than one move is equal in value.
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