Question: what is checkma8? 

Answer: Checkmate (frequently shortened to mate) is a situation in chess (and in other boardgames of the chaturanga family) in which one player's king is under attack and there is no way to meet that threat; it is a check from which there is no escape. The king is never actually captured—the game ends as soon as the king is checkmated. A player who is checkmated loses the game. Delivering checkmate is the ultimate goal in chess (although not all games end in checkmate often a player resigns before checkmate is administered, or the game may end in a draw in several ways).
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