NNNxN

PxP 12 N xN PxN 13BxQP P-B4 14 B-K3 R-Nl 15 Q-B2 B-K3 16B-K2N-Q2 17 0-0N-K4 18 P-QN3 N-B3 19 Q-Q2 and Black has inadequate compensation for the pawn, Spassky-Gheorghiu, Marianske Lazne 1962. HQxN (239) This idea of Spassky's has now replaced the older idea 11 P xN and a) 11 P-B4 12 P-QN4 and here al) 12 P-N3 13 P-N5 Polu-gayevsky-Bobotsov, Sofia 1961. a2) 12 P xP 13 N-R2 N-R4 14N xP P-B4 15 PxP PxP 16 B K2 N-B5 with an excellent game for Black,...

BP xPPQR

A) 10 N-N3 N-Kl 11 B-Q3 N-B4 12 B-QB2 P-B4 13 B-B2 P-B5 (13 B-R3J ) 14 N-Bl P-QR4 (14 Q-N4 15 R-KN1 Q-K2q ) 15 P-QR3 B-Q2 16 N-Q2 P-QN4 17 Q-K2 R-Nl 18 0-0 P-N4 (18 . . . P-R5-) 19 P-QR4 Petrosian-Penrose, Palma 1969. b) 10 P-KN4 P-KR4 11 P-KR3 and now bl) 11 N-R2 12 P xP Q-R5 + 13 B-B2 Q x P R4 14 N-N3 Q-N4 b2) 11 N-N3 12 B-N5 Q-Kl 13 B-R4 B-Q2 14 P-QN3 Bobotsov-Ong Yok Hwa, Zwolle 1966. 10 P-KN4 An idea of Lilienthal's is 10 N-N3, but it appears unconvincing after 10 P-QN4 11 P-KR4 P-N5. 10...

RNl

D421 12 P-QR4 13 B-Bl Q-B2 14P-QR4 after which White is worse. Correct, of course, was 14 P-N3 intending P-R3 and P-QN4. P-QR4 in such situations is only good for White (cf. D422) if the exchange BP xQP answered by BP x QP has occurred. In that case P-QR4 contributes towards the control of the Q-side light squares (b5 c4) which White can occupy with pieces. If White plays P-QR4 before this exchange has occurred he merely blockades his own army, since the squares b5 and c4 are not yet available...

Knk Qr

Osnos-Vogt, Zinnowitz 1971, went 13Q-Q2P-B5 14BxNPxB 15 Q-Q3 N-B3 Not 15 BxP 16 QxP 16 0-0-0 Q xBP 17 P-N5P-K5 18Q-Q2N-R4 19NxKP Q-R5 20 R R1-B1 If 20 N xQBP P-B6 21 N-B3 N-N6 22 R-R2 BxN 23 PxB QxBP F Uhl-mann 20 P-B6 21 N-Nl N-N6 with much the better prospects for Black. After 1 P-Q4 N-KB3 2 P-QB4 P-KN3 3 N-QB3 B-N2 4 N-B3 0-0 5 P-K4 P-Q3 6 B-K3 263 Larsen used this move during his run of tournament victories in 1967, though it was known at least as far back as 1931. This seems best...