How to Write a Bidding System: Notes Template and Checklist

To write a bidding system, start from a standard base such as 2/1 Game Force, write down only where your partnership differs, and organize the notes by opening bid so either of you can find any auction in seconds. For every agreement, record three things: what the call shows, whether it is forcing, and what the next bids mean.

Good system notes are short, searchable and tested on real hands. Bad ones are long, copied from somewhere else, and never read again. This guide gives you a template, the order to write things in, the meta-rules that cover undiscussed auctions, and a way to test the notes before they cost you a board.

Nobody should build a system from nothing. Pick a well-documented base and agree that it applies whenever your notes are silent:

Then your notes become a list of differences and details: "We play 2/1 as in BWS, except: 1NT response is fully forcing; inverted minors are off in competition; we play Walsh style over 1♣." That one paragraph tells a new partner more than ten pages of copied conventions.

Organize the notes the way an auction unfolds. This template works for any natural system:

1. General approach. Base system, notrump ranges, opening style (light or sound, Rule of 20 or not), seat and vulnerability changes.
2. 1NT and 2NT openings. Responses, including Stayman, transfers and invitations. What happens when the opponents double or overcall.
3. One of a minor. Minimum length, responses, raises, opener's rebids, Walsh or not.
4. One of a major. Responses, the 1NT response, raises (limit, Jacoby 2NT, splinters), 2/1 auctions.
5. Strong 2♣. Responses, the second negative, rebids.
6. Weak twos and preempts. Ranges by seat and vulnerability, 2NT asks, responses to three-level preempts.
7. Slam methods. Key-card responses (1430 or 0314), cue bidding style, quantitative notrump bids.
8. Competitive bidding. When they overcall our opening, when they double, negative and responsive doubles, lebensohl.
9. Defensive bidding. Overcalls, takeout doubles, defenses to their 1NT, strong club and Multi.
10. Carding. Opening leads against suits and notrump, signals, discards.
11. Meta-rules. The defaults for undiscussed auctions (below).

Use one table per opening, and one row per auction. Here is a sample section for the 1NT response to a major in 2/1:

Three habits make this format work:

1. Always fill the "Forcing?" column. Most disasters are not about what a bid shows but about whether partner may pass it.
2. Give ranges in numbers. "Invitational" means different things to different people. "10-12" does not.
3. Write the exceptions next to the rule. If the agreement changes after a passed hand or interference, say so in the same row.

Write in order of how often the auction comes up, not in order of how interesting it is. A rough priority list:

1. Opening ranges and the 1NT structure, including what you do when they interfere over your 1NT.
2. Responses to one of a suit, especially the 1NT response and raises.
3. Opener's rebids and the forcing status of responder's second bid.
4. The first round of competition: their overcall of your opening, your negative doubles, your overcalls and takeout doubles.
5. Defense against their 1NT.
6. Slam methods: key-card responses and cue bidding.
7. Rare auctions: defenses against artificial openings, grand slam tools, special preempts.

A strong partnership with excellent notes on step 7 and vague ones on step 4 loses more boards than a pair with the reverse.

No set of notes covers everything. Meta-rules are general principles that answer the auctions you never discussed. Some widely used examples:

• An undiscussed bid is natural.
• A jump in a new suit after a fit is agreed is a splinter: shortness and support.
• 4NT is key-card Blackwood when a suit is agreed and quantitative after a natural notrump bid with no suit agreed.
• Doubles of preempts are for takeout.
• A cue bid of the opponents' suit shows a good raise or a strong hand, not a wish to play there.
• Fast arrival: after a game force, a jump to game shows a minimum.

Write your meta-rules at the top of the notes. They are the part your partner is most likely to need at the table, because they cover the auctions you forgot.

Notes that were never tested are only a wish list. Three ways to test them:

1. Bid practice hands together. Deal 20 hands, bid them separately, then compare. Every disagreement is a missing line in the notes.
2. Check against standard meanings. The free bid meaning page explains any auction in 2/1, SAYC, Acol, Precision and Polish Club, so you can see how the robots of each system read a call before you decide yours. For example, see how each system reads opener's jump to 4♣.
3. Bid the same deals as a pair. A Bidding Challenge lets you and your partner bid the same boards and compare the results afterwards.

1. Naming a convention without its follow-ups. "We play Jacoby 2NT" is not an agreement until you know what opener's rebids mean and what happens after them.
2. Copying a long document. Forty pages from the internet that neither of you has read are worse than two pages you both know.
3. Forgetting interference. Every structure needs a line for "and if they double" and "and if they overcall". This is where most partnership accidents happen.
4. Adding conventions faster than you practice them. A new gadget is worth points only when both partners remember it under pressure. Add one at a time.
5. Leaving ranges vague. Write "15-17", "10-12" and "6+ cards", not "strong", "invitational" and "long".
6. Writing notes that only one partner reads. Go through them together, aloud, auction by auction. Every "oh, I thought..." is a line to fix.

1. Date every version and keep a short change log at the top.
2. Keep an "accidents" list. After each session, write down every auction you misunderstood and the agreement that fixes it. This list is the most valuable page you own.
3. Prune. If a convention came up once in a year and you got it wrong, drop it. Simpler is usually better.
4. Sync the convention card. The convention card is the short public summary; the notes are the full version. Opponents are entitled to know your agreements, so keep both accurate.

For a sense of how different systems solve the same problems, see bridge bidding systems compared and the list of common bridge conventions.