[Index]System Dutch Doubleton

Dutch Doubleton

westra (20-6): 1C-1D real or 0-5
                    -1H 12-14 bal or ?
                       -1S-1NT 12-14
                    -1NT 18-19

Dutch Standard American

1NT

niemeijer (14-3): 1H-1NTforcing-2C w AQ96 J9753 A9 QT

2NT Jacobi

niemeijer (14-2): 1S-2NT-3C/D/H singleton J9763 AT4 AQ32
                        -3S strong KQ9872 K2 A4 K97
                        -3NT 14-16 AQT32 T6 KJ53 A3
                        -4C/D/H void KJT43 KQ42 - AT94
                        4S weak T7632 AK2 KJ5 Q3

Fantoni-Nunes

fantoni (13-11): 1H-3H(weak)-3S-4H-4S-4NT no keycard
                                     -5H keycard, no C/D-control