some general info if you play with vang for the first time and don’t have enough time to discuss (usually on BBO)
standard signals:
high encourage on our suits, normal count on declarer suits.
leads: 4th at NT, 3/5 at suit contracts. top of sequence (or interior seq: j from aj10, kj10), king lead ask count.
lavintahl discards (ALT: italian first discard)
after our 1NT opening: 4-suit transfers (2s trf to clubs, 2n trf to diamonds); 4H/S=natural to play
simple checkback after 1nt/2nt rebid
rckbw 30-14-2-2+Q
standard weak 2 including diamonds. 2nt ask feature.
after 1M, 2NT is INV+ fit 4+. simple answers, 3M from both side reject invitation, anything else is (semi-)natural.
after 1m, 2NT is inv. NO inverted minor raise (unless we talk). 1m-2m=simple raise; 1m-3m=INV
if unclear, it is forcing. if unclear, it is take-out.
NO puppet after 2nt opening. stayman and transfer.
NO support doubles (in those positions, it shows extra values)
after opp NT, 2C is both majors, anything else natural.
strong jump shift (without competition) goldman/soloway/lawrence style. in competition, any jump shift is suit+fit inv+.
