13. TRUMP SQUEEZE CONDITIONS
    ========================
In NTs, when a long suit is led, one of the opponents is forced to unguard a
suit. In trump squeeze, there is an advantage that by ruffing, an established
card of the opponent is ruffed and a small card of the declarer is promoted.
Conditions are:
(i)   Dummy has 2 cards each in 2 suits controlled by one opponent, and you
      are not holding any card in one of the two suits.
(ii)  One of the two suits is accompanied by a master card, in the dummy in
      which you are holding a menace card.
(iii) In addition to the entry through master card in the dummy, there is one
      more entry in the dummy, either in the same suit in which master card is
      held or another suit.
(iv)  Two trumps are held in hand and one played as squeeze card. After the
      opponent is forced to discard from one of the two guarded suits in
      the dummy is established by ruffing.