1. e4 e5
2. Nf3 Nc6
3. c3 f5!?

<Ponziani Countergambit is a playable alternative to usual continuations 3...d5 and 3...Nf6.>

4. d4 d6

<The main continuation here is 4...fxe4. The move chosen by Tarrasch is more risky.>

5. d5

<This move characterizes so-called Schmidt Attack but the most challenging continuation for black here seems to be 5. exf5 Nf6 (5...Bxf5 6. Bb5 is better for white) 6. Bb5 e4 7. Ng5 d5 8. f3, where white seems to be able to keep some advantage, for example 8...h6 9. Ne6 Bxe6 10. fxe6 Qd6 11. fxe4 dxe4 12. O-O Qxe6 13. Nd2 Bd6 14. Bc4 Qe7 15. Re1 O-O-O 16. Nxe4 Rhe8 17. Bd3 etc.>

5... Nce7
6. Bb5+

<A solid alternative seems to be 6. exf5 Nf6 7. c4 Bxf5 8. Nc3 etc.>

6... c6
7. dxc6 bxc6
8. Bc4 Qc7

<After 8...fxe4 white has 9. Nxe5 and the Knight cannot be taken for 10.Bf7+ +- but after 9...d5 black seems to be fine. The game continuation leads to troubles for black.>

9. Ng5! Nh6
10. f3

<Here 10. Ne6 deserved attention.>

10... g6

<10...f4 would have been safer.>

11. a4 Rb8
12. b4 fxe4
13. fxe4 Bg4?

<This could have been the losing move. But black position was already difficult anyway, and after relatively better 13...d5 14. Bb3 Bg7 15. exd5 cxd5 16. Bxd5 white has clear edge.>

14. Ne6

<This is not bad but even stronger would have been 14. Be2! Qd7 15. O-O with overwhelming advantage, for example 15...Bxe2 16. Qxe2 Nc8 17. Qa2 d5 18. Nd2 Be7 19. Nb3 etc.>

14... Qd7
15. Qb3

<More accurate would have been 15. Nxf8! Rxf8 16. Qd3 Nhg8 17. h3 Be6 18. Bxe6 Qxe6 19. Be3 with clear advantage.>

15. .. d5
16. exd5 cxd5
17. Nxf8?

<In tactically complex position white allies make a mistake, which turns the table. After 17. Nc5 dxc4 18. Nxd7 cxb3 19. Nxb8 Bg7 the situation is quite unclear but white is definitely not worse.>

17... Rxf8

<More accurate would have been 17...Qf5! with advantage.>

18. Bb5?

<Black's imprecission in the previous move gave white a chance to play 18. Bd3 Nhf5 19. 0-0 with more or less equal position. Now white loses quickly.>

18... Rxb5!
19. Bxh6 Qf5!

<White King in the centre is now helpless.>

20. Bxf8 Qe4+
21. Kd2 Qxg2+
22. Kc1 Qxh1+
23. Kb2 Rb6

<This is sufficient but 23...Rb7 with intention to retake the Bishop by Rook was more precise.>

24. Bxe7 Kxe7

<Black has an extra Pawn, and his central Pawns are unstoppable force.>