the number after represent an increment of that much (in seconds) after each move. the u states that the challenge is an unrated one. no rating changes will be made after that game.
What does this mean
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It's call the fischer clock, the second number is the time in seconds added to your clock each time you make a move...
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when i play live chess with some player, i see rate "10 5 u or 30 0 u". I only knew that 10 mean time of game. Pl telll me more about the what does number mean