Notes by Dr. Tarrasch.

1. 7.Qxd4 B x B, ch, ought to have been played first, and White would have got a good game, whilst now the Queen's Knight gets displaced.
2. 8…Ne7 Through repeated exchanges Black has now freed his cramped position.
3. 10.Qc3 White wishes to prevent the development of the King's Bishop, but he does not attain this object, and deprives his Knight of its best square; Q to K 3 would have been better.
4. 11.Na3 After Kt to Q 4 the same counter-move would follow.
5. 11…Qf6 Well played; Black does not mind having his Pawns doubled, in order to relieve the pressure on the King's Knight's Pawn. White ought on his part to exchange rather than move his Queen away; his chances of attack are about nil.
6. 12…O-O-O Black is now better developed and soon proceeds to attack.
7. 13.c4 This weakens Queen's 4th, but other moves give no better result for White.
8. 15.Bd2 White gives up the Pawn either willingly or forced; if he strengthens it with P to B 3, Black attacks it again with P to B 4.
9. 15…Be7 Black could easily take the Pawn; after R x P; 16. RxR, QxR; 17. R to K sq, Q to B 4; 18. R to K 8, ch, and White gets an attack which no sooner begins than it is ended.
10. 17…Bd4 Black has played admirably with the King's Bishop, which now occupies a threatening position.
11. 19.Re2 A mistake which ought at once to lead to a definite solution; the Rook stands here unguarded. R to Q Kt 3 was a powerful defensive move.
12. 20…Nxh2 Black does not make the best use of his opportunities (see diagram); he might have decided the game here with—20.... Q to R 4; 21. P to R 3, Kt to Kt 8 (!); 22. P to Kt 4, Q x P, ch; 23. K x Kt, Q x P, ch; 24. K to B sq, Q to R 6, ch; 25. K to Kt sq, R to K 3, &c. Or 23. B x B, Kt x P; 24. P x Kt, Q x P, ch; 25. K to Kt sq, R to K 3; 26. B to B 4, R to Kt 3, ch; 27. B to Kt 3, R to R 3. Or if—22. R to K sq, Kt x P; 23. P x Kt, Q x P, ch; 24. K to Kt sq, R to K 3. Again if—21. B to B 4, B to K 4; 22. B x B, R x B; 23. P to R 3 (after P x Kt mate follows in 3 moves), Kt to Q 5, and wins the Rook. Or if—22. R to K 3, B x R.
13. 21.Bf4 After K x Kt, Queen checks at R 4 and takes the Rook.
14. 21…Ng4 Threatening R x P.
15. 22…Be5 Here, for the second time, Black could finish and even gain the brilliancy prize by—22.... Q to R 4, ch; 23. K to Kt sq, R to K 3 (threatening R to R 3); 24. R (K 2) to K sq (the Rook must make room for the King, as after B to B 4, R to R 3 follows), B x P, ch; 25. B x B, R to R 3; 26. K to B sq, R to B 3, and wins; or if—24. R to Q 2, B x P, ch; 25. B x B (if R x B, R to R 3; 26. K to B sq, Kt to K 6, winning the Queen), R to R 3; 26. K to B sq, R to B 3 (threatening Kt to K 6, ch, and at the same time Q to R 8, ch, which is followed by R x B, ch), and wins.
16. 23…Bxg3 And here Black has a third opportunity of winning with—23.... Q to R 4, ch; 24. K to Kt sq, R to K 3; 25. B x B, Kt x B; 26. Q to K 3 (Q to B 2, Kt to B 6, ch), R to R 3; 27. Q to R 3, ch, Q x Q, followed by R x P, and Black has two Pawns more; or—27. P to B 3, Kt x Q B P; 28. Kt x Kt, Q to R 8, ch, followed by Q x R; or if—25. R to K sq, R to R 3; 26. K to B sq, B x B; 27. Q x B, Kt to R 7, ch; 28. K to Kt sq, Kt to B 6, ch, and mates accordingly; or if—25. R to B 2, R to R 3; 26. K to B sq, Q to R 8, ch, followed by Q x Kt P, and a winning attack.
17. 24…Nf6 R x P cannot be played on account of 25. R x R, Q x R; 26. P to B 3.
18. 26…Nh5 Here R to K 4 at once was decisive; the only counter-move was P to Kt 4, and then followed P to K R 4 and K R to R 3.
19. 28…Nf4 A stronger attack would come from Q to Kt 4 (threatening the Rook and also the Knight by Q to K 6, ch), continuing with 29. R to K B 2 (!), Kt to B 5; 30. Q to R 2 (if Q to Q 7, R to Q sq, and Kt to R 6, ch), Q to B 3, followed by R to R 4, or 30.... R to K 3, followed by R to R 3.
20. 29…Ne6 Now the Knight is driven back, and the dangerous threat of R to R 4 is obviated by White.
21. 32…h5 The advance of this Pawn renews the attack.
22. 34.Qg4 The only square on which the Queen does not get lost through the Knight checking.
23. 36…hxg2 White brings his Rook to the King's side; Black could have prevented this, by attacking the Rook with 36.... Q to B 3. The Rook could not be played indifferently on account of P to R 7, ch, and Q to R 8, ch. After 37. R to Kt sq comes P x P, with much greater strength; for example, 38. K x P, Kt x P; 39. Q x Kt, R to R 7, ch. But if White instead of withdrawing the Rook played 37. Q to Q 7, then the King's side would be weakened by the removal of the Queen, and then follows—37.... R to Q B sq; 38. R to Q B 2, P x P; 39. Kt x P, Kt x P, ch; 40. K x P, Kt to K 8, ch, followed by Kt to B 7; or—39. R x P, Kt x P, ch; 40. K x P, Kt to R 5, ch; 41. K to Kt sq (K to Kt 3, Q to B 6, ch), Q to Kt 4, ch; 42. K to B 2, Q to Q 7, ch, with mate in a few moves. In the last variation, if 38. R to K B 2, Q to B 5 (threatening Q to Kt 6, followed by P x P or P to R 7, or perhaps Q to K 6, ch), with decisive effect. (See diagram.)
24. 38…Qf6 Q to R 3 was better (threatening Q to B 8, ch, and Kt to B 5, ch); 39. P to B 4, Kt x P; 40. R to Kt sq, Q to R 7, &c.; or if 39. R to Q B 2, Q to K 6; 40. Q x P, Q x P, ch; 41. K to K sq, Q x P, ch; 42. K to Q 2, Q x P, ch, &c.
25. 39.e5 To deprive the Queen of the capture of the King's Bishop's Pawn. After Q x K P there could come Q x Kt P.
26. 40…e4 R to R 5 would have been a great mistake on account of R x Kt. Black now sacrifices the Knight, being sure of getting his opponent's Knight; but this would have been very difficult if White had played 41. Q x P, and if Q to R 8, ch; 42. Q to K sq, threatening R x Kt.
27. 43.Kg3 Or he might have played 43. Q x P, Q to Kt 2, ch: 44. K to Kt 3, R x R, ch; 45. K x R, Q x Kt; 46. Q x P.
28. 44…Qxd5+ Black can now exchange Rooks and take the Knight or force the attack with R to K sq.