You mean call the flag?
The term is from literal chess clocks, which have a little flag in the face so that when the minute hand reaches 12, the flag drops. You set the time on the clock (non-digital, but digital chess clocks are sacrilegious) so that at the end of the time limit, the clock is at 12 noon.
Under USCF and FIDE rules, the game doesn't end on time unless the winning player calls it.

You can change the clock settings, but if you give a computer unlimited time, it'll pretty much take it. Calling the flag is an option for the human player, if the computer exceeds it's time allotment, it will continue to play. You can too, so you can play the position out, or you can call the flag and win. The GNUChess engine automatically calls the flag on the human player.
I use a setting of 20 minutes for games on Winboard against the chess engines - not too long, but not so quick you're constantly playing the clock, not the opponent.
The term is from literal chess clocks, which have a little flag in the face so that when the minute hand reaches 12, the flag drops. You set the time on the clock (non-digital, but digital chess clocks are sacrilegious) so that at the end of the time limit, the clock is at 12 noon.
Under USCF and FIDE rules, the game doesn't end on time unless the winning player calls it.

You can change the clock settings, but if you give a computer unlimited time, it'll pretty much take it. Calling the flag is an option for the human player, if the computer exceeds it's time allotment, it will continue to play. You can too, so you can play the position out, or you can call the flag and win. The GNUChess engine automatically calls the flag on the human player.
I use a setting of 20 minutes for games on Winboard against the chess engines - not too long, but not so quick you're constantly playing the clock, not the opponent.
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