At least Grand Casino Helsinki which i have mostly played at has "one night, one stack" rule. It states that if you return to a table where you played before you must begin with same stack that you had when you left (or min buy-in, if its less than that). But of course its not very strictly enforced.
Anyways i don't really see why this rule should be used at BK. Its not used anywhere i've played at online.
(ocultar) Si deseas jugar una partida contra un adversario de nivel similar, puedes definir en tu invitación de nueva partida un rango BKR apropiado a tu interés. En tal caso, nadie con un BKR fuera de dicho rango podrá ver o aceptar la invitación. (Katechka) (mostrar todos los consejos)