Choosing Your Signalling System
🎯 Learning Objective: To understand what defensive signals are for, to learn the one system this course teaches as standard, and to know — in plain terms — the small number of alternatives you will meet at the club so that you and your partner can agree on the same language.
💡 Key Idea: A signal is not a private message to yourself. It only works if your partner is playing the same system and is watching for it. Ninety per cent of “my partner never reads my signals” is really “we never agreed what the signals mean.” Signalling is a partnership agreement — it is not part of Acol or SAYC, and you and your partner choose it together, once, and then stick to it.
The three questions a card can answer
When you cannot win a trick, the card you play is rarely wasted — it can carry a message. There are only three messages a defender ever sends, and they answer three different questions:
1. Attitude — “Do I like this suit?” The most common and highest-priority signal. A high spot card says encourage — keep leading this; a low spot card says discourage — look elsewhere.
2. Count — “How many cards do I hold here?” High-then-low shows an even number; low-then-high shows an odd number. Count helps partner work out declarer’s shape and know when a suit is about to become good.
3. Suit preference — “Which other suit do you want?” When attitude and count are already known or irrelevant, a high card asks for the higher-ranking of the two obvious side suits, a low card for the lower-ranking one.
Which question is being asked, and when
You do not get to choose which signal to give — the situation chooses for you. This is the single most useful table in defensive signalling, and it is worth committing to memory:
When partner has led the suit — and you are following: give attitude first, count second.
When declarer (or dummy) has led the suit — and you are following: give count first, suit preference second. Partner already knows your attitude is irrelevant here, so the useful information is length.
When you are discarding — because you cannot follow suit: your first discard is attitude to the suit you throw. Later discards can show count or suit preference.
The system this course teaches: Standard
Throughout these lessons the worked answer will always use Standard signals: high encourages, low discourages for attitude, and high-low shows an even number for count. We teach Standard because it is the most widely played method in the world, it is what a stranger at the club will assume you are playing, and it is the easiest to learn first. Every mechanics lesson that follows carries a short note in this form — “if you play the upside-down method instead, reverse this” — so you are never locked in.
The alternatives you will meet — and only need to recognise
You do not need to play any of these to be a good defender. You only need to recognise them so that, if a new partner says “I play upside-down,” you know what they mean and can agree in ten seconds.
Upside-Down Count and Attitude (UDCA). The exact reverse of Standard: low encourages, high discourages; low-high shows odd, high-low shows even. Many strong players prefer it, for one good reason — you no longer have to waste a valuable high card to encourage in a suit like K-J-10-2. Its low cards are also clearer (a 2 is unmistakably low; a 7 might be either). A common expert halfway house is upside-down attitude with Standard count. Genuinely good, but not worth the confusion for a partnership still finding its feet.
Odd-Even (Roman) discards. Used on discards only. An odd card encourages the suit thrown; an even card discourages and points suit preference (a high even card wants the higher side suit, a low even card the lower). The attraction is that it packs attitude and suit preference into a single card.
DODDS. A first-discard-only scheme where an even card encourages and an odd card asks for the other suit of the same colour. Compact, but note the trap below.
⚠️ Common Mistakes:
Odd-Even and DODDS have opposite parity. In Odd-Even the odd card encourages; in DODDS the even card encourages. Two pairs who each mumble “we play the odd-even thing” can be playing dead opposites. Agree explicitly which one, or you will hand declarer free tricks.
Thinking “not wasting a high card” is unique to DODDS. It is not — that advantage belongs to the whole odd-even family (and to upside-down) over Standard. Do not pick DODDS for a reason that several systems share.
Playing a different system in each direction without saying so. Your leads are not affected by any of this — you still lead high from a doubleton and top of a sequence. Signals and leads are separate agreements.
The card you can and cannot afford
Whatever system you choose, you can only signal with the cards you hold. Signalling low is easy. Signalling high can cost you — the 8 from K-J-10-8-2 is a real card you may need. This single fact is the case for the upside-down method, and it is why the choice is not simply “Standard is best.” It is a genuine trade-off, and the right answer is whichever one you and your partner will both read correctly under pressure.
🧠 Memory Tip: Whose suit is it? is the question that unlocks everything. Partner’s suit → Attitude. Declarer’s suit → Count. Discarding → Attitude again. “A-C-A” — and within each, high is happy in Standard.
Summary
A signal is a shared language, useless unless both partners speak it. There are three messages — attitude, count and suit preference — and the situation, not you, decides which one applies: partner’s suit asks attitude, declarer’s suit asks count, a discard shows attitude. This course teaches Standard (high encourages, high-low is even) because it is the common tongue of the club. Recognise UDCA, Odd-Even and DODDS well enough to agree with a new partner, watch the opposite-parity trap between Odd-Even and DODDS, and remember that the whole reason the choice is interesting is that a high encouraging card is sometimes a card you would rather keep.