===== unusual over unusual ====
after 1M - (2NT) :
  * 3!C shows hearts, 3!D shows spades, 3!H hearts, 3!S spades
  * first two bids shows a better hand than direct 3!H/3!S
  * when it's fit, one bid is competitive fit, the other INV+
  * when it's new suit, one is competitive, the other is (near?) GF

direct double shows desire to penalty. pass then double is takeout.