Taimanov
Karpov-Portisch, Portoroz Slav Defense 1975.
This is the Dutch Variation, or Technical System.
P-K3
Rarely tried, this variation wins the minor Exchange and provides play on the light squares.
Trying to preserve the QB. If 9____QN-Q2 10. P-B3 B-N3 11.
P-K4 P-K4 12. PxP QNxP 13. B-K2 secures White the advantage.
B-R4
On 10____N-Q4? 11. PxB! QxN 12. Q-B3! Q-Ql! 13. B-Q2
B-K2 14. B-Kl N-R3 15. B-B2 N/3-N5 16. P-K4 N-N3 17. B-QN3 R-Bl 18. QR-Q1 White has the better center, better development, and the two Bishops.
12. NxB
B-N3 RPxN Q-K2
Likewise, 13. . . . Q-N3 14. R-Ql R-Ql 15. P-N5 N-Q4 16. P-K4 favors White.
On 14____KN-Q2 White prevents ... P-K4 with 15. P-B4!
White wins the Exchange with 18. . . . PxP? 19. P-N4! BxP 20. NxB QxN 21. B-R3.
And with control of the center and superior development, White is in control and won on his 32nd move. After 21. B-QB4 the two main threats are 22. Q-N3 and 22. P-N4! QxR? 23. B-N2.
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