Games start from the standard initial setup by default, but it is possible to start new games from any setup.
Other setups can be given at challenges, in the following two ways::
With move list: the given sequence of valid moves that reach the specific setup.
With FEN line: this is the standard one line description of any position (either invalid)
With these two ways we can exercise openings, middle games or endings, or can replay games from one point, or else.
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