# alias: SixKeyRKC
# button-text: 6-Key RKC
# gib-works: false
# bba-works: false
# auction-filter: Auction.....\n(1S +Pass +2[HDC]|1H +Pass +2[DC]|1D +Pass +2C|1C +Pass +2D)
# convention-card-ns: 21GF-DEFAULT
# convention-card-ew: 21GF-GIB

/*@chat
--- 6-Key Roman Key Card Blackwood
When the partnership has agreed on TWO suits, there are 6 key cards instead of 5:
the four aces and the kings of BOTH agreed suits.

Auctions that establish a 2-suit fit (responder's 2-level bid is 2/1 GF):
. 1!S - 2!H - 3!H - 3!S     spade fit + heart fit
. 1!S - 2!D - 3!D - 3!S     spade fit + diamond fit
. 1!S - 2!C - 3!C - 3!S     spade fit + club fit
. 1!H - 2!D - 3!D - 3!H     heart fit + diamond fit
. 1!H - 2!C - 3!C - 3!H     heart fit + club fit
. 1!D - 2!C - 3!C - 3!D     diamond fit + club fit

Responses to 4!N (1430 style for the lower-ranking trump suit):
. 5!C  = 1 or 4 key cards
. 5!D  = 0 or 3 key cards
. 5!H  = 2 key cards, denies the queen of either trump suit
. 5!S  = 2 key cards, shows the queen of the HIGHER-ranking trump suit
. 5!N  = (in a later round) all 6 key cards held — partner may jump to 7

Follow-ups after 5!H / 5!S:
. 5!N         asks for kings — cue-bid them up the line
. 5!C / 5!D   (when not a trump suit) asks about the trump queens

Note: BBA does not play 6-Key RKC — its 4!N is standard 1430 for a single
agreed suit. This scenario is for human practice, not robot bidding.

https://longbeachbridge.com/6-key-roman-key-card/
@chat*/

# 6-Key RKC: two-suit fit with slam interest
dealer south

#include "script/Calm-Opponents"
# Defines calmOpps

#include "script/Predict-Opening-1-Bid"
# Defines oneSpade, oneHeart, oneDiamond, oneClub (South as opener)

# South opens 1-of-suit with 5+ in opening suit and 4+ in a side suit.
# North responds 2-of-side-suit (2/1 GF) with 5+ in that suit and 3+ support
# for opener's suit. The 2-level new-suit response below GF must be in a suit
# higher than opener's, so the side-suit choices are:
#   1S opener:  side suit H, D, or C  (responder bids 2H / 2D / 2C)
#   1H opener:  side suit D or C      (responder bids 2D / 2C)
#   1D opener:  side suit C           (responder bids 2C)
#   1C opener:  side suit D           (responder bids 2D — 2H/2S would be jump shifts)

fitSH = oneSpade   and hearts(south)>3   and spades(north)>2   and hearts(north)>4
fitSD = oneSpade   and diamonds(south)>3 and spades(north)>2   and diamonds(north)>4
fitSC = oneSpade   and clubs(south)>3    and spades(north)>2   and clubs(north)>4
fitHD = oneHeart   and diamonds(south)>3 and hearts(north)>2   and diamonds(north)>4
fitHC = oneHeart   and clubs(south)>3    and hearts(north)>2   and clubs(north)>4
fitDC = oneDiamond and clubs(south)>3    and diamonds(north)>3 and clubs(north)>4
fitCD = oneClub    and diamonds(south)>3 and clubs(north)>3    and diamonds(north)>4

twoSuitFit = fitSH or fitSD or fitSC or fitHD or fitHC or fitDC or fitCD

# Slam zone: combined values consistent with bidding 6 of a suit.
# Combined HCP capped at 36 to avoid grand-slam territory where the auction
# detours into Grand Slam Force or 5NT pick-a-slam.
combinedHCP = hcp(south) + hcp(north)
slamRange = hcp(north)>11 and combinedHCP>29 and combinedHCP<37

twoSuitFit and slamRange and calmOpps

produce 1000
action
average "south HCP    " hcp(south),
average "north HCP    " hcp(north),
average "combined HCP " combinedHCP,
average "opens 1S     " 100 * oneSpade,
average "opens 1H     " 100 * oneHeart,
average "opens 1D     " 100 * oneDiamond,
average "opens 1C     " 100 * oneClub,