Mini Key-card Blackwood

- are used after a pre-empt in a minor suit at the 3-level.
- The inverted minor suit at the 4-level is question after key-car.
4C after 3D, and 4D after 3C.

1-step : 0 keycard, not queen of trump
2-step : 0 keycard, + queen of trump
3-step : 1 keycard, not queen of trump
4-step : 1 keycard, + queen of trump
5-step : 2 keycard, not queen of trump
6-step : 2 keycard, + queen of trump

This convention was send to us by Nils Kåre Kvangraven.
Woodgrove suggest these supplement. 

After the number of keycard is shown, you can ask how many cards the pre-empt bidder has in the suit. The lowest suit except the trump suit, are question after suit length. 

Answere:
1-step: 6 card.
2-step: 6 card + side king.
3-step: 7 card.
4-step: 7 card + side king.
5-step: 8 card