Odds chess

Odds chess is not one variant with a single fixed ruleset. It is a family of handicap games: before play begins, one player receives an agreed advantage intended to make a game between players of different strength more balanced.

The advantage can take several forms. With material odds, the stronger player starts without a specified piece or pawn. With time odds, that player receives less time on the clock. Players may also agree on move odds, where one side gets extra moves at the beginning, or on other special conditions.

After the agreed handicap is applied, the game usually continues under normal chess rules unless the conditions say otherwise. There is no universal conversion stating that one particular piece or amount of clock time exactly compensates for a given skill gap; the handicap depends on the chosen format and agreement.

In this term, odds means an agreed handicap or advantage, not a mathematical estimate of the probability of winning. The central idea is to change the starting conditions, not to predict the result.