Game 47 in the book: A. Evenssohn–Alekhine, a Philidor's Defence played in an exhibition at Kieff in May 1916. Alekhine's blockade leaves White's bishop smothered and ends in a mating attack.

1. 3…Nf6 This move, introduced by Niemzovitch into Master play, is now thought stronger than 3. ....Kt—Q 2 (the Hanham variation, see Game No. 36).
2. 5…Be7 The usual move. In my opinion 5. ....P—K R 3 is more prudent.
3. 6.O-O For now White could have secured a slight advantage for the end-game by playing 6. P x P!, Q Kt x P! (not P x P, because of 7. B x P ch, K x B; 8. Kt—Kt 5 ch, K—Kt 1; 9. Kt—K 6, Q—K 1; 10. Kt x B P, followed by 11. Kt x R, and White has the advantage); 7. Kt x Kt, P x Kt; 8. Q x Q ch, B x Q; 9. B—Kt 5 followed by Castles Q R, and White, besides having the better development, has prospects of seizing the only open file. The immediate sacrifice, however, would be unsound, e.g.: 6. B x P ch, K x B; 7. Kt—Kt 5 ch, K—Kt 1; 8. Kt—K 6, Q—K 1; 9. Kt x B P, Q—Kt 3; 10. Kt x R, Q x P!; 11. R—B 1, P x P!; 12. Q x P, Kt—K 4, and Black has a winning attack.
4. 7.dxe5 This exchange of Pawn only disengages Black's game. Better would be 7. Q—K 2, P—B 3; 8. P—Q R 4! and White has the advantage. See Game No. 9.
5. 9.a4 This move is essential in this variation to prevent the possibility of a counter-attack eventually by ....P—Q Kt 4.
6. 10…Nc5 Now Black's game is preferable, for he has the prospect of occupying the squares Q 5 and K B 5, without giving his opponent counter-chances on the King-side or in the centre.
7. 11.Ne1 Without any necessity White assumes the defensive. 11. Q R—Q 1, followed by the doubling of Rooks on the Q file, was more likely to equalize the game. Broadly speaking, the retreat of a Knight to the first rank, where it cuts the line of communication of the Rooks, is only admissible in very exceptional cases.
8. 13.Qd1 Or 13. B x Kt, P x B; 14. Kt—Q 1, B—Q 3; 15. P—K Kt 3, B—K R 6; 16. Kt—Kt 2, Q R—K 1; with a marked advantage for Black.
9. 15.Bxe6 After the compulsory exchange of this Bishop, the development of which is the most serious difficulty of this variation, Black's game becomes far superior.
10. 16.Qc1 In view of the threat 16. ....P—B 4; and also to prepare the eventual advance of White's P—K B 4. But Black, quite rightly, ignores this counter-attack and simply increases the pressure in the centre.
11. 16…Rd7 For if now 17. P—B 4, then Kt—Kt 5!, and White cannot play 18. P—B 5, because of R x Kt, followed by 19. ....Kt x B and 20. ....B—B 4.
12. 19…c5 This move prepares the following exchanges, the object of which is to weaken the Black squares in the adverse position.
13. 20.b3 If 20. Kt—B 3, P—B 5; 21. Kt—Q 5, Q—Q 3; 22. Kt—B 1, Kt (R 4)—B 5; and this last move will be even more powerful than in the actual game.
14. 20…Nhf4 Simple and decisive strategy. Black brings about the exchange of the two adverse minor pieces which might counteract his pressure on the Q file, leaving White with a Bishop only, the action of which is manifestly nil. The second phase of the game is a typical example of a regular blockade leading to the complete smothering of White's position.
15. 23.c3 White was threatened with 23. ....P—B 5; 24. P—Q Kt 4, P—B 6; followed by R—Q 5.
16. 26…Qe6 Freeing the square at K 4 with the intention of posting his Bishop there.
17. 28.b4 A desperate bid for freedom. If Black takes the Pawn the White Rooks can occupy the Q B file.
18. 28…c4 But Black opposes this plan.
19. 29…g5 Before assaulting the enemy's entrenchments it is essential to block the King-side completely and to secure the command of the diagonal Q R 2—K Kt 8.
20. 31.Qa1 Another attempt to free himself, this time by opening the Q R file. Like the preceding one it is doomed to failure.
21. 34.Bh4 If 34. R P x P, R P x P; 35. P x P, Q x P; 36. B x P, R—Q 7; 37. R x R, R x R; 38. B—B 2, P—B 6; and Black wins.
22. 35.Be1 Otherwise Black plays 35. ....P—Kt 6 and the White B would remain locked out for the rest of the game.
23. 36.Qa7 This skirmish momentarily retards the Pawn's advance to Q Kt 4, followed by the entry of the Queen at K 6 via Q Kt 3.
24. 36…Qc6 Threatening 37. ....R—R 1.
25. 40…Qe3 Definitely maintaining one Rook at Q 8 after the exchange of the other, which settles the fate of White's Bishop and of the game.
26. 43…Rd1 Winning at once, for there is no perpetual check.