It is (3) ______ believed that the word “chess” comes from “shah”, the Persian word for “king” and that “checkmate”, the game's winning (4) ______ move, comes from the phrase “shah mat, ....

It is (3) ______ believed that the word “chess” comes from “shah”, the Persian word for “king” and that “checkmate”, the game's winning (4) ______ move, comes from the phrase “shah mat, .................