Game 16 in the book: Alekhine's win over O. Duras at the Masters' Quadrangular Tournament at St. Petersburg, 1913. A Ruy Lopez annotated by Alekhine, who plays White.

1. 5…b5 This move, in conjunction with the next one, affords Black the simplest method of equalizing the game.
2. 7.a4 The opening of the Q R file is of great moment in this variation. Black cannot prevent it, for if: 7. ....P—Kt 5; 8. B x P ch, K x B; 9. Q—B 4 ch, P—Q 4; 10. Q x B, Q—Q 3; 11. Q x Kt!
3. 9.d3 After 9. Kt—B 3, Black could simply Castle, for after 10. Kt x Kt P, P—Q 4! and he obtains an attack fully equivalent to the Pawn sacrificed. After the text-move White can eventually play P—B 3 and bring his Knight to K 3 or K Kt 3 via Q 2 and K B 1.
4. 10…Bg4 Here Black could have obtained an even game by forcing the exchange of White's only well posted piece, the K B, by 10. ....B—K 3. It is clear that White would not have reaped any advantage by exchanging at K 6 and Q B 4, as Black would have had command of the centre, thanks to his Pawn position and the two open files.
5. 11…Bh5 Consequent but not best. 11. ....B—K 3 was even now preferable and would have brought about variations similar to those resulting from the immediate development of the B at K 3.
6. 13…Nd4 This offer to exchange is premature, and, as will be seen, gives White a marked positional advantage. Relatively better would have been 13. ....Q—K 2 followed by Kt—Q 1—K 3, although in either case Black has the inferior game.
7. 14…Bxf3 Forced, for otherwise the Black Bishop would have been in jeopardy, e.g.: 14. ....B x B; 15. P—Kt 4, B—Kt 3; 16. Kt x B, P x Kt; 17. P—K B 4, etc., or 14. ....P x B; 15. P—Kt 4, B—Kt 3; 16. Kt—R 4, followed by P—K B 4, with advantage to White in either variation.
8. 16.e5 The beginning of a strong attack against Black's K B 2, weakened as it is by the premature exchange of Black's K B. Furthermore it is interesting to observe how important it is for White's attack to have the open Q R file.
9. 16…Qe7 Besides this move and the sequel it implies, Black had a further choice of two lines of play: I.—16. ....P x P; 17. Q x P, Q—Q 3; 18. Q x Q, P x Q; 19. K R—K 1 with advantage to White; or II.—16. ....K R—K 1; 17. P—K 6!, P x P; 18. B x P ch, K—B 1 (if K—R 1; 19. Kt—Kt 5); 19. P—Q Kt 4!, B x P (if B—Kt 3; 20. K R—K 1, etc.); 20. Kt x P, R—Kt 3!; 21. Q—B 3!, B—B 6; 22. Kt—B 6, R x Kt; 23. Q x R, B x R; 24. R x B, and White has the better game.
10. 18…dxe5 Forced, as P—K 6 was threatened.
11. 20.Qg5 Forcing a further exchange which brings the Knight into decisive action.
12. 20…Rxe5 It is clear that 20. ....P—R 3 would have achieved nothing after 21. Q—B 5.
13. 21.Nxe5 Already threatening mate after Kt x P.
14. 21…Qb6 Relatively best. 21. ....Kt—Q 2 would not be sufficient, e.g.: 21. ....Kt—Q 2; 22. Kt x P!, R x Kt; 23. R—R 8 ch, Kt—B 1; 24. Q—B 5!, Q—K 2; 25. B x R ch, Q x B; 26. Q x B and wins. The move in the text removes the immediate threat, for now 22. Q—B 5, would be insufficient as a preliminary to the Kt sacrifice, as Black could prepare a fresh defensive position by 22. ....P—Kt 3, followed by K—Kt 2, etc.
15. 22.g4 But this somewhat hidden preparation of the Kt sacrifice wins at once, as Black is compelled to make a reply which will render his position still more precarious.
16. 22…Bd6 If 22. ....P—Kt 3, then 23. Q—R 6 threatening either Kt x B P or R—R 8; and if 22. ....B—K 2; 23. Kt—Q 7!, Kt x Kt; 24. Q x B, Q—Q 3; 25. Q x Q, P x Q; 26. R—R 5, R—Kt 1; 27. R—R 7, R—Q 1; 28. R—Kt 7 and wins.
17. 24.Qf5 The point of the manoeuvre started with 22. P—Kt 4! Against the double threat of 25. B x R ch, followed by 26. P—Kt 5, or else 25. Q—K 6 Black has no defence.
18. 24…g6 If 24. ....Q—B 3; 25. P—Kt 5, Q—Q 2; 26. B x R ch, K x B (if Q x B; 27. P x Kt) 27. Q—B 3; and White wins.