# alias: XferAfter1MajorX
# button-text: Xfer after 1M (X)
# gib-works: false
# bba-works: true
# auction-filter: 1[HS] X
# convention-card-ns: 21GF-DEFAULT
# convention-card-ew: 21GF-GIB

/*@chat
--- Transfer after 1M (X)
Transfers start at 1N and end at 2M-1.
  • 1N  --> 2!C
  • 2!C --> 2!D
  • 2!D --> 2!H
  • 2!H --> 2!S (only after 1S opener)
Transfers into a new suit, show something like a weak 2, or better and less than 3-card support.
A 1-under jump at the 3-level is a transfer (1!H (X) 3!D, or 1!S (X) 3!H). So, responder has
two ways to raise to the 2- or 3-level. A direct raise is 4-7 and the 1-under jump is 8-10.
With less than invitional values, raise to the limit! 2-level w/3, 3-level w/4, or game w/5.
With a fit and invitional+ values (11+), bid 2NT.
Finally, XX is Business with less than 3-card support.
https://www.nxtbook.com/acbl/bridgebulletin/2025_06/index.php#/p/66
@chat*/

# Transfers after 1M (X)
dealer north

# North opens 1 Major

NT = shape(north, any 4333 +any 4432 +any 5332) and hcp(north)>14 and hcp(north)<18
S_ = spades(north)>4 and spades(north)>=hearts(north) and spades(north)>=diamonds(north) and spades(north)>=clubs(north)
H_ = hearts(north)>4 and hearts(north)>=diamonds(north) and hearts(north)>=clubs(north)

oneS = S_ and hcp(north)>11 and hcp(north)<20 and not NT
oneH = H_ and hcp(north)>11 and hcp(north)<20 and not NT

c3 = (oneS and spades(south)==3) or (oneH and hearts(south)==3)
c4 = (oneS and spades(south)==4) or (oneH and hearts(south)==4)
c5 = (oneS and spades(south)==5) or (oneH and hearts(south)==5)

# East makes a takeout double
XoneS = hcp(east)>11 and spades(east)<2 and hearts(east)==4 and diamonds(east)>2 and clubs(east)>2 and shape(east, xxxx -any 7xxx -any 6xxx) 
XoneH = hcp(east)>11 and spades(east)==4 and hearts(east)<2 and diamonds(east)>2 and clubs(east)>2 and shape(east, xxxx -any 7xxx -any 6xxx)

(oneS and XoneS) or (oneH and XoneH)

action
average "4-7   w/3 " 100 * (hcp(south)>3 and hcp(south)<8  and c3),
average "4-7   w/4 " 100 * (hcp(south)>3 and hcp(south)<8  and c4),
average "8-10  w/3 " 100 * (hcp(south)>7 and hcp(south)<11 and c3),
average "8-10  w/4 " 100 * (hcp(south)>7 and hcp(south)<11 and c4),
average "????  w/5 " 100 * (hcp(south)>7 and hcp(south)<11 and c5),
average "11+       " 100 * (hcp(south)>10),