RBB1

1.1 15-17 Balanced

1.2 Small Doubleton

1.3 5-card Suit in a Balanced Hand

1.4 5-card Major

1.5 Upgrade for Quality Length

1.6 Upgrade Beyond 1NT Opening

1.7 1NT Semi-Balanced

1.8 20-21 Balanced

1.9 Semi-Balanced 2NT

1.10 Upgrade to 2NT