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#
What is
Isomorphic
in poker?

Isomorphic in poker refers to strategically equivalent cards. Isomorphic hands can apply to hole cards or community cards. Isomorphism is commonly used to reduce the gamespace of poker. For example, there are 22000 flops, but since many of them are isomorphic, this can be reduced down to 1755 strategically distinct flops.
Example 1) AsKs is strategically identical to AcKc on a Th9h7h flop; therefore, these two hands are isomorphic.
Example 2) Kh9s3h is strategically identical to Kd9c3d; therefore, these two flops are isomorphic.