5-card major

This system is just standard 5-card majors with best minor opening bids. This treatment is standard in many countries, including major bridge nations as USA, France and Germany.
1 12+ HCP, 3+ (Includes 3 3 but not 4 4)
1 12+ HCP, 4+ or 4 4 3 2
1 12+ HCP, 5+
1 12+ HCP, 5+
1NT 15 - 17 balanced
2 GF or 23+ balanced
2 Weak Two in
2 Weak Two in
2 Weak Two in
2NT 20 - 22 balanced

In this system there are countless varieties. The most variable are the responses to the opening bids 1 and 1. A 2 over 1 may or may not be game forcing, 2NT can be natural, or it might show some kind of raise, a jump shift is either weak or strong, etc.

Some variants are:

  • Standard American
  • Forum D+
  • 5ième Majeur
  • 2/1 GF
  • Preparatory Club is related, although in this system, 1 only shows a doubleton. 1