I don't speak Spanish but I think I know what you mean. Your opponent probably had set a conditional move. If you make the move he expected you to make then his move will be made automatically, whether he is online or not.
Look here: http://support.chess.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=673
Los jugadores de que está hablando usan los movimientos condicionales. Mira a página de la Web que Gomer_Pyle acaba de pegar.
You were right Gomer_Pyle, that is what he's talking about. High School spanish ftw!
Ok thanks
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Alguien del T. México me podría explicar como puede un jugador responder instantáneamente una jugada sin aun estar en línea.