A variation of RKC 1430 that is an improvement over the original convention. After a suit has been agreed upon, a bid of the suit (or NT) immediately ABOVE the trump suit initiates RKC 1430.
After a trump suit is agreed, 4NT begins RKC1430. Alternative treatments are RKC 3014 or Kickback 1430 (or 3014). Author prefers Kickback 1430, but agree with partner first!