==== Overview ====
  * natural, 5 card majors (in 1st/2nd)
  * variable notrump - 12-14 / 15-17 depending on position and vulnerability
  * 1!C and 1!D opening may be with 3 cards
  * 2!D the only strong opening (GF)
  * 2!C opening - artificial, weak with both majors (54/45/55/64/46)