W grupie ZAP na warsztat weszły zaawansowane konwencje – magister podwójny. Dzięki takim gadżetom w prosty sposób można złapać odpowiedni bilans i znaleźć najlepszy kolor do gry na stosunkowo niskiej wysokości. Pozycja magistra to taka gdy w licytacji jednostronnej idzie:
1X-1M-1Y
gdzie X i Y to dowolne miano a M to któryś z kolorów starszych.
Wtedy odzywka 2 trefl oznacza SO na karach lub (prawie dowolny inwit). Natomiast odzywka 2 karo oznacza dowolny GF.
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