An **Impure Sequence** (often just called a *Sequence* or *Run* in traditional Indian Rummy) is a group of **three or more consecutive cards of the same suit** that uses at least one **Joker** (either a printed Joker or a wild/designated Joker) as a substitute.
To make a valid valid declaration or win a game of Indian Rummy, you **must** have at least **two sequences**, and at least **one of those sequences must be a Pure Sequence** (made without any Jokers). The second sequence can be an Impure Sequence.
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1. Key Rules of an Impure Sequence
* **Consecutive Order:** The cards must follow a strict numerical or face-value sequence (e.g., 5, 6, 7).
* **Same Suit:** All natural cards in the sequence must belong to the exact same suit (Hearts, Spades, Diamonds, or Clubs).
* **Joker Substitution:** A Joker takes the place of a missing card in the run.
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2. Examples of Impure Sequences
Here are common examples of how Impure Sequences are formed using Jokers:
### Example 1: Using a Wild Joker
* **Cards:** 5♣ - 6♣ - **[Printed or Wild Joker]** - 8♣
* **Explanation:** The missing 7♣ is replaced by the Joker. Because 5, 6, (7), and 8 are consecutive cards of the same suit (Clubs), this is a valid Impure Sequence of four cards.
### Example 2: Using a Printed Joker
* **Cards:** King of Hearts ($\text{K}\varheart$) - **[Printed Joker]** - Jack of Hearts ($\text{J}\varheart$)
* **Explanation:** In standard Rummy, a printed Joker can represent any missing card. Here, the Joker substitutes for the Queen of Hearts ($\text{Q}\varheart$) to complete the run: $\text{K}\varheart$, ($\text{Q}\varheart$), $\text{J}\varheart$.
### Example 3: Multiple Jokers in a Run
* **Cards:** 4♠ - **[Joker]** - 6♠ - **[Joker]**
* **Explanation:** Even though two Jokers are used, it still forms an Impure Sequence because they successfully represent the missing 5♠ and 7♠ of the same suit. *(Note: House rules vary on the maximum number of Jokers allowed in a single sequence).*
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3. Pure Sequence vs. Impure Sequence
To understand why an Impure Sequence is classified as such, look at the difference:
| Sequence Type | Definition | Example (Spades) |
| --- | --- | --- |
| **Pure Sequence** | 3+ consecutive cards of the same suit **without** any Jokers. (Mandatory to win). | 4♠ - 5♠ - 6♠ |
| **Impure Sequence** | 3+ consecutive cards of the same suit **with** at least one Joker. | 4♠ - **[Joker]** - 6♠ |