How do you split a three-way Hold'em pot when two players tie for the main pot but one wins the side pot?

How to use this answer

This answer is based on the mathematical principle or published rule identified in the source below. If the question involves a live betting market, confirm its settlement definition before applying it to a specific bet.

Tournament rules are a useful reference, but a home game or cash game can have different house rules. Make the chip amounts, action sequence and card visibility clear before deciding a disputed hand.