Two Over One

Comparative Bridge

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Two Over One Bidding System

This system has been structured over SAYC Bidding System. Basic auction is similar but Two Over One is a more artificial system. There are some important differences between two systems.

Major opennings requires always 5 cards in all sitting positions.

A suit response in 2nd level without jump (as in the name of the system) to any one level suit openning is game forcing. Second level responses require 12+ HCPs and 5 cards of major or 4 cards of minor. On the other hand if the 1st opponent overcalls in 2nd level or with 1 Spade, then response in second level should not be taken as game forcing. One more thing, if the responder bid before and pass, then his response in 2nd level is not game forcing

Concequently, 1 NT response to 1 major opennings is one tour forcing, shows 6-12 points and does not deny support. Some players accept 1 NT response to also minor opennings as one tour forcing. We will not repeat the first tour biddings here which you can examine from the SAYC system, but we will consider the second tour biddings.

Opener	Responder	Opener	Explanation
1 Spade	1 NT	2 Spades 3 Spades 2 Hearts 3 Hearts, Diamonds, Clubs 2 Diamonds 2 Clubs 2 NT	12-15 HCP, 6 cards 16+ HCP, 6 cards 12-18 HCP, 4+ cards 19+ HCP, 4+ cards 12-18 HCP, 3+ cards, no 4 cards of Hearts 12-18 HCP, 2+ cards, no 4 cards of Hearts 18-19 HCP balanced
1 Heart	1 NT	2 Hearts 3 Hearts 2 Spades 3 Diamonds,Clubs 2 Diamonds 2 Clubs 2 NT	12-15 HCP, 6 cards 16+ HCP, 6 cards 17+ HCP, 4 cards 19+ HCP, 4+ cards 12-18 HCP, 3+ cards, may be 4 cards of Spades 12-18 HCP, 2+ cards, may be 4 cards of Spades 18-19 HCP balanced

After a natural rebid by opener there is no difference in biddings from SAYC system. We will examine the rebid of responder after 2 minors rebid of the opener in the following table.

Opener	Responder	Opener	Responder	Explanation
1 Spade	1 NT	2 Clubs	Pas 2 Suits 2 Spades 2 NT 3 Clubs 3 Spades 3 Suits 4 Spades	6-9 HCP 5+ cards of Clubs, no 2 cards of Spades 6-9 HCP 5+ cards, no 2 cards of Spades 6-9 HCP 2+ cards 10-12 HCP, no 3 cards of Spades 10-12 HCP, 5+ cards 10-12 HCP, 3+ cards of Spades 10-12 HCP, 6+ cards 10-12 HCP, 3+ cards of Spades + distribution points

This system generally applies the following conventions in addition to SAYC.

Minor Suit Stayman

Bergen

Responsive Doubles

Splinter Bids

Jordan 2 SA

Lebensohl

Inverted Minor

Gambling 3 NT

Trefl Drury

Roman Key Card Blackwood