# alias: ImpossibleNegative
# button-text: Impossible Negative
# gib-works: false
# bba-works: true
# auction-filter: Note....any 4441
# convention-card-ns: Precision
# convention-card-ew: 21GF-GIB

/*@chat
--- Impossible Negative after 1!C opening
After a Precision 1!C (15+ HCP), responder bids 1!D with any 4441 hand and 8+ HCP.
This "impossible" negative bid (looks like 0-7 HCP) allows responder to later reveal shape:
  • Jump in singleton after opener's rebid (if opener hasn't bid it)
  • Jump to NT if opener bids responder's singleton
https://www.bridgebum.com/impossible_negative.php
@chat*/

dealer south

# South opens 1C (Precision: 16+ HCP)
hcp(south)>15

# North has Impossible Negative: any 4441, 8+ HCP
and hcp(north)>7 and shape(north, any 4441)

# Calm opponents
and hcp(east)<10 and hcp(west)<10