Common Indian 13-card Rummy uses drawing and discarding to arrange every card into valid sequences and sets. A completed declaration requires at least two sequences, including one pure sequence.
13-Card Rules and a Valid Declaration
In common Indian 13-card Rummy, each player arranges thirteen cards into sequences and sets while drawing and discarding on successive turns. A valid declaration needs at least two sequences, including at least one pure sequence. All cards must fit the required valid groups; finishing one attractive group is not enough to finish the hand.
A sequence consists of consecutive ranks in the same suit. A set groups cards of the same rank in different suits. The pure sequence must be formed without a joker substituting for a missing card. For example, 4-5-6 of spades is a pure sequence, and three sevens in different suits can form a set. These definitions apply to the 13-card format described here; Gin Rummy and other Rummy variants can use different hand sizes and finishing rules.