Opener bids 1C, responder bids 1D, opener rebids 1NT (12-15 HCP).

	In Two-Over-One, opener will suppress bidding a 4-card major (even with two 4-card majors) with a balanced hand. Responder has shown either: (1) no 4-card major, or (2) 5 Diamonds and a 4-card major with 13 or more HCP. If responder’s rebid over 1NT is a major suit, opener knows exactly responder’s shape and strength (at least 13 HCP).
	In Standard, usually opener will bid “up-the-line” showing a 4-card major.

The requirements to respond with a Two-Over-One bid.

	Two-Over-One requires 13 HCP (or a good 12), forcing to game.
	Standard requires 10 HCP (some play 10 TP counting for length), forcing for one round.

The bidding sequences after a Two-Over-One response.

	In Two-Over-One the opener’s jump rebid or reverse doesn’t show or deny extra values.
	In Two-Over-One the opener never makes a jump shift rebid after a two-over-one response.
	In Two-Over-One the principle of Fast/Slow Arrival is more readily applied. Fast arrival means no slam interest.

The requirements to respond 1NT to a major suit opening.

	In Two-Over-One a response of 1NT shows 6-11 HCP (or a poor 12) and is forcing for one round. There are some situations where the responder will have 13+ HCP but can’t make a convenient bid and will use 1NT as a waiting bid. Also in 3rd or 4th seat, opener may pass a 1NT response if opening was light.
	In Standard a response of 1NT shows 6-9 HCP and is non-forcing.

The bidding sequences after a 1NT response.

Follow-up bidding sequences differ, but not greatly.

With some important differences, many bidding sequences where a 1NT or Two-Over-One response is not made are the same.

Virtually all bidding gadgets (conventions) are interchangeable between Two-Over-One and Standard.

Bidding a suit of lower rank than the opener’s suit at the two-level.

Must have at least 13 HCP or a “good” 12 HCP.

Usually shows at least a 4-card suit:

Exceptions:

	Bidding 2H over 1S always guarantees at least 5 Hearts.
	In the special case where opener bids 1S and you have something like: xxx_AKxx_AQJ_xxx  You can’t support Spades, you can’t bid 2H (you must have at least five) and don’t have enough to bid 3NT (also no Club stopper), can’t bid 2NT which is Jacoby 2NT. So bid a convenient 2D for a two-over-one game force.

2D is two-over-one.

2H is not two-over-one, RHO overcalled. A “Free Bid” showing 10+ HCP and a five-card suit.

2C is two-over-one.

2S is not a two-over-one. A weak jump shift, less than 6 HCP and 6-card suit.

2C is not two-over-one, RHO doubled. A 5-card suit, no trump support and less than 10 HCP. Redouble with 10+ HCP.

A 1NT response to opener’s bid of one in a major is a forcing notrump bid.

A 1NT response to opener’s bid of one in a minor is not a forcing notrump bid.

Normally a forcing one-notrump bid by responder shows:

	6-11 HCP
	And the inability to make a bid at the one-level (e.g. can’t bid 1 Spade over opener’s 1 Heart bid).
	And can’t support opener’s suit.

When 3rd or 4th seat opens with a major suit and responder bids 1NT, the bid is played as forcing if opener has full opening values. If opening was light (might have bid a 4-card major), the opener can play the 1NT as non-forcing and pass.

With a five-card diamond suit and a four-card major and at least a good 12 HCP always bid 1D and bypass the four-card major. On your next turn bid the four-card major. This tells your partner exactly what you hold and that you have at least a good 12 HCP.

With Ax_KJxx_KQxxx_xx.....bid 1D then rebid hearts.

With a five-card diamond suit and a four-card major and less than a good 12 HCP you will bypass the five-card diamond suit.

With Ax_KJxx_QTxxx_xx.....bypass the diamonds and bid 1H.

With a five-card club suit and a four-card major and at least a good 12 HCP always bid 2C ( a 2/1 response). On your next turn if you now bid your four-card major you are promising a five-card club suit.

With KTxx_xx_Kx_AQJxx.....bid 2C then rebid spades. This promises five clubs and four spades.

With a four-card club suit and a four-card major, always bid the major suit first, even with 12+ HCP.

With KTxx_xxx_Kx_AQJx.....bid 1S.

With a four-card club suit and no four-card major, bid 2C with at least a good 12 HCP (a 2/1 response).

	With KTx_xxx_Kx_AQJx.....bid 2C.
	With KTx_QJx_Kx_Axxxx.....bid 3NT.

With a six-card or longer suit, make a Weak Jump Shift conventional bid..

Anything else, pass.

With one 4+ card major suit, bid it, regardless of the shape of the rest of the hand (bypass a longer minor suit).

With 4/4 in the majors, bid 1H (up the line).

With 5/5 or 6/6 in the majors, bid 1S, the higher ranking..

With uneven length in the majors, bid the longest suit.

With neither four-card major, and a “balanced” hand, bid 1NT with 6-10 HCP.

With neither four-card major, and a “balanced” hand, bid 2NT.

[ 1m  Pass  2NT………………….11 – 12 HCP

With neither four-card major, bid 1D over an opening of 1C. This denies holding a 4-card major except when you have 12+ HCP, a 5-card Diamond suit and a 4-card major.

Without a 4-card major, and with a “good 9” to 12 HCP, raise opener’s suit using the conventional Inverted Minor bid (at least a good 4-card suit is promised). Raising opener’s minor suit denies holding a 4+ card major.

Without a 4-card major, and with 6 to a “poor 9” HCP, and a 5-card suit (rarely a 4-card suit), jump raise opener’s suit using the conventional Inverted Minor bid. Raising opener’s minor suit denies holding a 4+ card major.

If requirements for a two-over-one bid are met, make it.

If partner opens 1C and you have a 5+ card Diamond suit and a four-card major, bid the longer minor suit first, then come back with the major on your rebid (note: with less than 12 HCP you would not bid your minor, but instead bid the four-card major bypassing the minor).

With neither four-card major, and a “balanced” hand, bid 3NT.

[ 1m  Pass  3NT………………….13 – 15 HCP

With 4/4 in the majors, bid 1H (up the line).

With 5/5 or 6/6 in the majors, bid 1S.

With uneven length in the majors, bid the longest suit.

With neither four-card major, bid 1D over an opening of 1C. This denies holding a 4-card major except when you have 13+ HCP, a 5-card Diamond suit and a 4-card major.

Without a 4-card major, raise opener’s suit using the conventional Inverted Minor bid (at least a good 4-card suit is promised). Raising opener’s minor suit denies holding a 4+ card major.

A 1NT rebid by opener denies having 4+ cards in the responder’s major suit, and has 12-15 HCP.

A jump 2NT rebid by opener denies having 4+ cards in the responder’s major suit, and has 18 to a poor 20 HCP and is not forcing.

Bid 1S Spade with four or more.

Bid 2S (WJS) with less than 6 HCP and 6+ Spades.

With less than four Spades, 7-10 TP and three Hearts, bid 2H (Constructive - Bergen).

With less than four Spades, 10-11 HCP and three Hearts, bid a Forcing 1NT.

With less than four Spades and less than three Hearts, bid a Forcing 1NT.

All other situations bid a Forcing 1NT.

With 7-10 TP and three Spades, bid 2S (Constructive).

With 10-11 TP and three Spades, bid a Forcing 1NT (jump in Spades next opportunity).

All other situations bid a Forcing 1NT.

If a two-over-one response bid is available, bid it.

Otherwise bid your suit at the one level.

Opener shows a 6-card suit and a minimum opener (11-14 HCP) and responder usually passes.

	With a doubleton in opener’s known 6-card suit and invitational values (12 TP), responder may raise to the three level.
	With three cards in the opener’s known 6 card suit and invitational values, responder usually will jump to game with nice distribution.

Responder should never “rescue” opener to a new suit.

Assume that opener has 5 Spades and 4 Hearts.

With less than 10 HCP

	Take a preference to Spades with a doubleton Spade and three or less Hearts.
	Pass with 4 Hearts, or with a singleton Spade and at least a doubleton Heart.

With 10-12 HCP and no fit for either major, rebid 2NT showing precisely less than 3 Spades, less than 4 Hearts and exactly 10-12 HCP, with reasonable cards in both minor suits.

With 5-card support in the minor suit and a weak hand (6-8 HCP), pass.

With 5-card support in the minor suit and invitational values (9-11 TP), raise his minor suit.

Without 5-card support and a weak hand, but a doubleton in the opener’s major suit, raise his major suit.

With a weak hand  without 5-card support or a doubleton major-suit support, bid your own long suit.

With an invitational hand without 5-card support and without a doubleton major suit support, jump-bid your own long suit (6+ cards).

With a relatively flat hand (no 6-card suit) and with invitational values (10-12 HCP) and no particular fit for opener’s suits, bid 2NT.

Opener’s 2NT rebid shows 16 -18 HCP and a relatively flat hand.

Responder usually either passes or bids 3NT.

Opener’s 3NT rebid shows 19+ HCP and a balanced hand.

Responder usually passes.

Also, opener’s 3NT rebid may instead show a 16-18 HCP and a solid, long suit (6 cards), sort of a “gambling,” trick-taking description.

Responder usually passes.

Exceptions:

	If responder has a 3-card limit raise for the opener’s major suit, bid game in the opener’s major suit.
	If responder has an unbalanced hand with one very long suit (6+ cards) he may choose to “takeout” the contract from notrump to his own suit. With a minimum hand he bids his suit at the cheapest level; with game-going values he bids game in his suit.

When responder makes a two-over-one bid, announcing a five-card or longer suit and game-going values, opener bids naturally:

Bids a new 4 card suit if he has one (doesn’t show or deny extra values).

Rebids his major if it is 6+ cards long (doesn’t show or deny extra values).

Jump rebids his major if it is 6+ cards long (doesn’t show or deny extra values, shows a solid suit).

Bids 2NT (shows unbid suits stopped and 12-15 HCP).

Bids 3NT (shows unbid suits stopped and 15-17 HCP).

Raises or jump raises responder’s major suit with 3 cards to an honor, or 4+ cards (use Principle of Fast Arrival).

Seek a notrump contract.

Seek a minor-suit contract.

North

East

South

West

1S

Pass

2C

Pass

2S

North

East

South

West

1S

Pass

2C

Pass

2NT

When opener has a 6+ card major and can’t rebid a new suit, notrump or support responder’s suit, he rebids his major. His rebid at the two level doesn’t deny extra values.

If opener jump rebids his major at the three level, he doesn’t show or deny extra values, but shows a solid, 6 card suit like AKQJ62.

When opener bids 1S, responder bids 2H, opener rebids 3H. Opener shows at least 3-card Heart support and a hand that’s good enough to suggest a slam¾”slow arrival”.

When opener bids 1S, responder bids 2H, opener rebids 4H. Opener shows at least 3-card Heart support and a hand that initially shows no interest in bidding toward a slam¾”fast arrival”.

North

East

South

West

1S

Pass

2D

Pass

2S

Pass

3D

Pass

3H

In competition, bids #1, #2 and #3 are on. These bids in competition are, in essence, following “The Law”.

If responder has 4-card support and 7 - 10 points (bid #4), raise to 2 in competition. This is still constructive and partner should assume you may have only 3-card support. At your next turn to bid, if opponent’s are still competing, make a three-level bid which is now telling partner you have 4-card support and are following the “Law” and not inviting.

Bids #4 (see above), #5, #6 and #7 are off.

If used, Bid #8 is on.

With a limit raise or better (3+ card support and 10+ points) cue bid opponent’s suit.

Otherwise preempt with bids at the 3 or 4-level in opener’s suit using the “The Law”.

With a limit raise or better, with 4+ card support and 10+ points, bid 2NT (Jordan 2NT convention).

Otherwise preempt with bids at the 3 or 4-level in opener’s suit using the “The Law”.