|R O M A N K E Y C A R D B L A C K W O O D|
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Eddie Kantar wrote four different books trying to describe how to overcome the problems with this form of Blackwood, and numerouse auxiliary conventions such as Kickback, Redwood, Minorwood, etc, have been devised to compensate for the failures inherent in it, but it is still one of the world's most popular conventions. Four books! And yet, two players will sit down to play for the first time and one will ask, "fourteen thirty or the other?"
"No, I play zero three one four."
And with that they go on to the next item on the card. So much for Eddie's four books.
Good and Bad
The idea of making the king of trump equivalent to an ace was a great improvement over the old standard Blackwood, and being able to ask about the queen is almost as valuable. RKC works wonderfully well when your trump suit is spades, but not so well with hearts and is awful with the minors. Let me show you a disaster caused by the agreement. This hand occurred at BBO, BridgeBase Online.
I'm pretty sure you can see the problem without me pointing out the obvious... Declarer was committed to slam off two aces because the trump suit was hearts and not spades, which could have been passed. Like I said, the convention works great when you have the master suit.
Major Suit Keycard - MSK (Created by Roy Wilson)
Major Suit Keycard is a modified Blackwood that is optimized for majors, hence the name. It will also work for minors, but a partnership would do better using Gerber or Minorwood when the trump suit is clubs or diamonds.
4NT is the asking bid:
The same agreement can be used with the 5NT asking bid after a response of 6.
If you would like a more complete explanation of Roman Keycard try: