The most common mistake new rummy players make is misunderstanding sequences. Since every valid declaration needs at least one pure sequence, this is the rule worth learning first.
What is a pure sequence?
A pure sequence is three or more consecutive cards of the same suit with no joker used as a substitute.
- 4♠ 5♠ 6♠ – pure sequence
- 9♦ 10♦ J♦ Q♦ – pure sequence (four cards is fine)
- Q♣ K♣ A♣ – pure sequence (the ace can be high)
- A♥ 2♥ 3♥ – pure sequence (the ace can be low)
What is an impure sequence?
An impure sequence is consecutive cards of the same suit where a joker fills one or more missing places.
- 6♥ Joker 8♥ – the joker replaces 7♥
- 10♣ J♣ Joker – the joker replaces Q♣ or 9♣
A special case: the wild joker in its natural place
Suppose the wild joker for the round is any 7. If you hold 6♦ 7♦ 8♦, the 7♦ is in its natural position. In most rule sets this still counts as a pure sequence, because the 7♦ is not replacing a different card. Agree on this rule with your group before you start.
What is not a sequence?
- 5♠ 6♥ 7♠ – mixed suits
- K♦ A♦ 2♦ – the sequence cannot wrap around from king to two
- 8♣ 9♣ – only two cards
Why the pure sequence matters
If a player declares without a pure sequence, the declaration is invalid and is usually penalised. Many experienced players also try to complete their pure sequence first, because it protects them from a large score if another player finishes early.
Quick practice
Deal yourself 13 cards and try to spot every possible pure sequence before looking for sets. Repeating this a few times trains your eye and makes real games much faster and more enjoyable.
