Chess positions often only have 1 good move. For example if someone captures your piece your only option is to re-capture: capture the piece that just captured your piece.
Another example might be that if your opponent puts your king in check there might be only one way to get out of check that doesn’t result in loss of a piece or checkmate.
As a result, it’s often possible to force your opponent to make a sequence of moves, because you can see logically that they only have one good response to each of your moves. Sometimes these sequences can get very long.
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