Russian writer Leo Tolstoy.
"A good chessplayer having lost a game is sincerely convinced that his loss resulted from a mistake he made and looks for that mistake in the opening, but forgets that at each stage of the game there were similar mistakes and that none of his moves were perfect. He only notices the mistake to which he pays attention, because his opponent took advantage of it. How much more complex than this is the game of war, which occurs under certain limits of time, and where it is not one will that manipulates lifeless objects, but everything results from innumerable conflicts of various wills!"
War and Peace