Notes by C. von Bardeleben.

1. 4…exd4 The usual move is P to Q 3; P x P is not good.
2. 5.Nxd4 White fails to take advantage of the weak fourth move of Black; he should have played 5. P to B 3, P x P; 6. Q to Q 5, or 5.... Kt to B 3; 6. P to K 5, Kt to K 5; 7. B to Q 5, Kt to B 4; 8. P x P, and would have obtained the better game.
3. 6.Nxc6 By this line of play White gets no attacking chances. An interesting and more promising continuation would be 6. Castles, and, if then 6.... Kt x P, White would be enabled to establish a brilliant attack by 7. Kt to B 5, P to K Kt 3 (if 7.... Castles (?); 8. Q to Kt 4, Kt to Kt 4; 9. Kt x B, ch, winning a Piece); 8. B x P, ch (!), K x B; 9. Q to Q 5, ch, K to B 3; 10. Kt to R 6 (!), and Black cannot save the King's Knight because of 11. Kt to Kt 4, ch, K to Kt 2; 12. B to R 6, mate; if Black plays instead of 9.... K to B 3, 9.... K to K sq, White may proceed with 10. Kt to Kt 7, ch, K to B sq; 11. B to R 6, Kt to B 3; 12. Kt to R 5, ch, K to K sq; 13. Kt to Kt 7, ch, drawing by perpetual check, or with 10. Kt x B, Kt to B 3 (!) (10.... Q x Kt [?]; 11. R to K sq); 11. Kt x Kt, Kt x Q; 12. Kt x Q, K x Q; 13. P to Q B 4, &c.
4. 7.Bd3 This move loses too much time. Better would be 7. Q x Q, ch, B x Q; 8. Castles.
5. 8…Qd7 This and the following move yield the second player the superior game.
6. 9.Qe1 An unsound and useless diversion of the Queen. Better would be the simple development of Pieces by 9. Kt to B 3, Castles Q R; 10. B to K 3.
7. 14…f5 Black plays too hastily for attack, and thus throws away his advantage of position. The right move was P to B 3; if then 15. P to K R 3, he answers P to K R 4, and White cannot take the Knight because of 15.... P x P; 16. Kt to Q 4, B to R 7, ch; 17. K to R sq, Q to B 2; 18. Kt x B, B to Kt 6, ch; 19. K to Kt sq, R to R 8, ch (!); 20. K x R, Q to R 4, ch; or 18. P to K Kt 3, Q to R 4.
8. 18.Nd4 Preferable would be 18. P x P.
9. 41.Nc4+ Better would be 41. Kt to Kt 3, but the ending is very difficult, and Black has, in any case, some chance for a draw.
10. 43…a5 In spite of the loss of the exchange Black has now at least an even game.