ACOL

ACOL is one of the oldest bidding systems. 4-card suits are bid up the line. The main problem lies with the vague major suit openings. The strong two openings also waste valuable space.

Opening bids

1	12⁺ HCP, 4⁺
1	12⁺ HCP, 4⁺
1	12⁺ HCP, 4⁺
1	12⁺ HCP, 5⁺ or 15⁺ 4 3 3 3
1NT	12 - 14 balanced
2	GF or 23⁺ balanced
2	SemiForcing
2	SemiForcing
2	SemiForcing
2NT	20 - 22 balanced