==== slam conventions ====
  * italian cuebids (first and second round control, up the line)
  * 4NT roman keycard blackwood: 30-14-2-2+Q
  * 5NT keycard asking when 4NT was bypassed in a cuebidding sequence (same answers as for 4NT)
  * 5M - in a slam sequence, 5M bypassing 4NT shows a hand wich either has all controls and ask partner for good trumps OR has good trumps but no other controls to cuebid
  * splinters