IMP/Precision/4441について、ここに記述してください。
https://bridgewinners.com/article/view/help-with-precision-club-please/
http://www.bridgebug.co.uk/4-4-4-1-hands
- Don't open 4-4-4-1 hands with 12 or 13 points
https://www.bridgebase.com/forums/topic/74250-dont-open-4-4-4-1-hands-with-12-or-13-points/
- Bidding the Dreaded 4441 Hand Pattern
https://www.bridgebase.com/forums/topic/48773-bidding-the-dreaded-4441-hand-pattern/
http://www.bridgeonsundays.co.uk/Opening%204-4-4-1%20hands.htm