If partner has called for trumps, and you are able to lead trumps to him,
lead the highest of three, the lowest of four, unless the ace be one of the
four, when lead the ace, then the lowest. If your partner lead winning
trumps, and you hold four, play to his leads, first, the lowest but one,
then the lowest. This shows four trumps at least. Also if, before either
you or your partner obtain the lead, you have {204} the chance of playing
an unnecessarily high card which does not damage your hand, do so, if you
hold four or more trumps and your partner has called. If the adversaries
either "call" or lead trumps, then, conceal the fact that you hold four. It
is even sometimes advisable, if you know your partner is weak in trumps,
and the adversaries are leading trumps, and you hold only three, to play
these as though you held four; the strong hand may then draw his partner's
last trump, under the impression that you hold it. Such "false-carding,"
however, should not be attempted until one has acquired proficiency in the
game.