Yet, according to Eugene Znosko-Borovsky, "How to Play Chess Endings", english translation, New York 1940, pages 218-9: "If anything, the Bishops are even more valuable in compromised positions, in which their defensive powers shine to advantage. In Diag. 119 [= after Black's 39th move], the black pawns are extremely weak, and the Bishops lack important diagonals, whereas the white Knights not only have good attacking positions, but they boast of admirable strong points. In addition, White has a distant passed pawn. Nevertheless, White does not succeed in winning the game, for the Knights are handicapped by the fact that, as soon as they move, the Bishops would instantly gain freedom of action, as their pawns would be able to move. To afford the Bishops open lines would be dangerous, and White must rest content with maintaining his present advantageous position, and, for want of anything better, undertake aimless manoeuvres."