1 – BBO System 2/1 – https://talk.vonabisw.de/Bridge/BBO/BBOSystem.pdf – https://talk.vonabisw.de/Bridge/BBO/BBOSystem.docx
2 – GIB’s convention card – https://webutil.bridgebase.com/v2/acblcc/acblCC.html?x=656469743d6e266b65793d4143424c2f4e2f7261696e2f313239383931343233395f313038365f667265642f3132393839313432333926706172746e65723d7261696e
3 – Understanding GIB Bid Descriptions –https://talk.vonabisw.de/Bridge/BBO/GIBBidDescriptions.pdf – https://talk.vonabisw.de/Bridge/BBO/GIBBidDescriptions.docx
4 – Principle of restricted choice – https://talk.vonabisw.de/Bridge/BBO/choice.pdf – https://talk.vonabisw.de/Bridge/BBO/choice.docx
2 über 1 partieforcierend
(hcp(south)>=13)&& ( (hcp(north)>=16&&hcp(north)<=21) || (hcp(north)>=11&&hcp(north)<=14) ) && ( (hearts(north)>=5&&(clubs(south)>=5||diamonds(south)>=5) )|| (spades(north)>=5&&(clubs(south)>=5||diamonds(south)>=5||hearts(south)>=5) ) )
Michaels Cue bid or Unusual 2NT
( (hearts(west)>=5&&shape(north, 5x5x+5xx5+xx55))|| (spades(west)>=5&&shape(north, x55x+x5x5+xx55))|| (clubs(west)>=4&&hearts(west)<=4&&spades(west)<=4&&shape(north, 55xx+5x5x+x55x))|| (diamonds(west)>=4&&hearts(west)<=4&&spades(west)<=4&&shape(north, 55xx+5xx5+x5x5)) )&& hcp(west)>=12&&hcp(west)<=19&&!(shape(west, any 5332 + any 4432 + any 4333)&&hcp(west)>=15&&hcp(west)<=17) &&hcp(north)>=6