In the context of chess matches, what is the term for the match lost after winning eleven?

The term used in the context of chess matches to refer to a match lost after winning eleven is "twelfth." This term specifically describes a situation in which a player has achieved eleven wins and then loses the subsequent match, therefore reaching the twelfth game where they must accept defeat.

In chess terminology, particularly in tournament settings or specific match formats, players may refer to the stakes or the outcomes based on the sequence of wins and losses. The identification of the "twelfth" match signifies a critical moment in the competition, emphasizing the importance of maintaining success through a series of games.

The other options do not accurately convey this specific context. "Last" and "final" are too general and do not directly relate to the sequence of matches, while "eleventh" refers to the prior number of wins rather than the loss itself. Therefore, the correct term here is "twelfth," as it encapsulates the scenario following eleven victories where the match is ultimately lost.