Signals are among the most valuable tools the defenders can employ to help them overcome the natural handicap of defense. In general, these signals take two forms — they are either positive or negative. A positive signal when you are discarding or following to partner’s lead is the play of a card higher than necessary. Thus, if your partner leads the king of a suit and you hold, say, the A-8-2, the play of the eight is a positive signal asking y…