Roberto Cosulich – Andrea Grinza
36th Italian Chess Championship; Pesaro, June 1975
Caro-Kann Defence B13
36th Italian Chess Championship; Pesaro, June 1975
Caro-Kann Defence B13
1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. c5!?
The Gunderam Variation, a sideline favoured by Grandmaster Sergio Mariotti. White gets a Queenside Pawn majority, but to the detriment of his own development.
5. ... e6. More often Black is caught in the dilemma of having to choose between a Pawn break in the centre and a Pawn break on the Queenside: 5. ... e5!? 6. dxe5 Ne4⩱ Mariotti – Pfleger, 7th International Tournament, Olot 1972 or 5. ... b6 6. b4 e6 7. Be3 bxc5 8. dxc5 a5 9. Qa4+ Nfd7 10. Nd2 Bb7 11. Nb3 axb4 12. Qxb4 Qc7∞ Mariotti – Flesch, 4th Memorial Ivan Parčetić, Sombor 1970.
6. Nc3 b6. Very instructive is 6. ... Be7 7. Nf3 0-0 8. Bd3 b6 9. b4 a5 10. Na4 Nbd7 11. Bf4 axb4 12. c6 Nc5! 13. dxc5 bxc5 and Black’s Pawn roller more than compensates for White’s extra piece, Prins – Richter, Richard Réti Memorial, Trenčianske Teplice 1949.
7. b4 Be7. 7. ... a5 8. Na4 Nfd7 9. Bb5 would give White much more than he dared hope for.
8. Bb5+ Bd7 9. Bf4 0-0 10. Bxd7 Nfxd7 11. Nge2 a5 12. a3 axb4 13. axb4 Rxa1 14. Qxa1 bxc5 15. bxc5. 15. dxc5 gives White two passed Pawns on the Queenside, but Black counterattacks in the centre by 15. ... d4 16. Ne4 Nc6 with a volatile initiative.
15. ... Nc6. 15. ... e5 16. dxe5 d4 17. Nxd4 Nxc5 seems playable enough for Black.
16. 0-0 e5 17. dxe5 (17. Qa4 Qa8=)
17. ... Ndxe5. Also good is 17. ... Nxc5 18. Rd1 d4 19. Be3 Ne6 with equality.
18. Rd1 Bxc5 19. Rxd5 Qe7 20. Bxe5 Nxe5 21. Ne4 Nd7? The losing mistake, leaving Black’s pieces overloaded with impossible defensive tasks. Both 21. ... Ng4! and 21. ... Ng6! merit consideration, so as to reply to 22. N2g3 with 22. ... Qa7! and apparently Black’s just about holding his own.
5. ... e6. More often Black is caught in the dilemma of having to choose between a Pawn break in the centre and a Pawn break on the Queenside: 5. ... e5!? 6. dxe5 Ne4⩱ Mariotti – Pfleger, 7th International Tournament, Olot 1972 or 5. ... b6 6. b4 e6 7. Be3 bxc5 8. dxc5 a5 9. Qa4+ Nfd7 10. Nd2 Bb7 11. Nb3 axb4 12. Qxb4 Qc7∞ Mariotti – Flesch, 4th Memorial Ivan Parčetić, Sombor 1970.
6. Nc3 b6. Very instructive is 6. ... Be7 7. Nf3 0-0 8. Bd3 b6 9. b4 a5 10. Na4 Nbd7 11. Bf4 axb4 12. c6 Nc5! 13. dxc5 bxc5 and Black’s Pawn roller more than compensates for White’s extra piece, Prins – Richter, Richard Réti Memorial, Trenčianske Teplice 1949.
7. b4 Be7. 7. ... a5 8. Na4 Nfd7 9. Bb5 would give White much more than he dared hope for.
8. Bb5+ Bd7 9. Bf4 0-0 10. Bxd7 Nfxd7 11. Nge2 a5 12. a3 axb4 13. axb4 Rxa1 14. Qxa1 bxc5 15. bxc5. 15. dxc5 gives White two passed Pawns on the Queenside, but Black counterattacks in the centre by 15. ... d4 16. Ne4 Nc6 with a volatile initiative.
15. ... Nc6. 15. ... e5 16. dxe5 d4 17. Nxd4 Nxc5 seems playable enough for Black.
16. 0-0 e5 17. dxe5 (17. Qa4 Qa8=)
17. ... Ndxe5. Also good is 17. ... Nxc5 18. Rd1 d4 19. Be3 Ne6 with equality.
18. Rd1 Bxc5 19. Rxd5 Qe7 20. Bxe5 Nxe5 21. Ne4 Nd7? The losing mistake, leaving Black’s pieces overloaded with impossible defensive tasks. Both 21. ... Ng4! and 21. ... Ng6! merit consideration, so as to reply to 22. N2g3 with 22. ... Qa7! and apparently Black’s just about holding his own.
22. N2g3! Threatens Ng3-f5.
22. ... f6. Or 22. ... g6? 23. Rxd7! winning right off.
23. Qd1! 1–0.
22. ... f6. Or 22. ... g6? 23. Rxd7! winning right off.
23. Qd1! 1–0.
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