 He demonstrated an important drawing technique with a rook and pawn versus rook endgame in what is known as the Philidor position.The Philidor Defense (1.e4 e5 2.Nf3 d6) is named for him.Philidor's book was the very first to give detailed annotations on how to play the middlegame, present chess strategy as a whole, and present the concepts of the blockade, prophylaxis, positional sacrifice and mobility of the pawn formation.