Chess arose in India as chaturanga, the four arms of the army, and Persia adopted it around 600 CE as shatranj. Shah means king; mat means defeated, frozen, or helpless. Declaring shah mat ended the game, and Arabic carried the phrase on as shah mat, the king is dead. Old French turned shah into eschec, giving English both check and chess itself, and checkmate for the kill. Rook is also Persian: rukh, chariot.
Chess is unusual: the terminology refused to assimilate. The pieces changed names, the elephant became a bishop, the vizier a queen, but the fatal phrase stayed phonetically Persian for fourteen centuries, a loanword so load-bearing that no translation could replace it. The board is Indian, the rules European, the vocabulary Iranian, and the etiquette Arabic: one game, four civilizations, no refunds.
The claim: chess's final refinement, the game ends the move before the king dies, preserving shah mat as a verdict pronounced rather than an execution performed, encodes a Persian court etiquette: real power never needs to touch the king, only to make his helplessness legible. Verdict: elegant and true to the rules, checkmate is checkmate before capture, by definition. Every political theorist since has been playing the same board: the helpless king falls on paper first.
When did you last tell a king he was finished in his enemy's language?