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B-QKt5

This powerful move justifies the previous exchange on B5. A quiet continuation would be inferior, for Black would maintain control of the important squares Q4 and K5 .with 13 . . . Kt-B3.

Best; after 13 . . . 0-0; 14 PxP, PxP Black would have no compensation for the weakness of his Ps. And 13 , . . P-B4 would be of dubious value, as it would leave the B out of play, while White's passed P might become formidable.

This recovers the Pawn advantageously.

• The only good reply. Black had to protect not only the B, but the QP as well.

«wa mSsSSSBSSSSSBSSt

Courtesy G. B. Van Goor Zonen

15 QxKtP QR.Ktl

To parry the threat of Kt-K5.

17 Kt-Ko was also possible, but then Black would be able to castle: 17 . . . R-Ql; IS R-Ql, O-O; 19 QxQ (not 19 QxP? QxQ; 20 RxQ, KtxKt and wins), BxQ; 20 KtxKt, RxKt; 21 B-Q2 and White stands better. The text is, however, more solid, as White's Kt is protected.

After 17 . . . P-Kt3; IS P-R5 Black would be at a loss for a good continuation, . . . R-K13 being impossible. The textmove, it is clear, gives Black good counterchances. White must exchange Qs.

18 QxQ KtxQ

Beginning a surprising combination. Less good would be 19 KtxP because of 19 . . . Kt-Kt6, when Black's positional superiority would amply compensate for the minus Pawn.

19 . . . R-Kt2 could be answered by 20 KtxP, for after 20 . . . Kt-Kt6; 21 R-R4 is possible, and^the QRP cannot be captured.

20 Kt-B2I BxP

Not 20 . . . RxP? 21 RxR, BxR; 22 P-QKt4 and White wins a piece.

21 P-QKt4! BxP

It would seem that White has overlooked that the QR was protected.

The brilliant explanation of White's combination. By sacrificing two Ps, White has secured the maximum effectiveness in the placement of his pieces. Black now finds himself in tremendous difficulties, and furthermore he cannot maintain his material advantage.

There is nothing better. On 22 . . . RxR? there follows 23 RxR, Kt-Q6 (if 23 . . . P-QR4;

24 KtxB wins); 24 BxP, R-Ktl; 25 B-Q4 and White has a won game. Or 22 . . . R-QKt3? 23 B-Q4 and White wins at least the exchange.

23 BxP R-K11

The seemingly stronger 24 B-Q4 would be met by the surprising rejoinder 24 . . . QR-K Kt3! This leaves two Black pieces en prise, but neither one can be taken:

I 25 RxB? RxPch; 26 K-Rl, Kt-K5I and it is difficult to parry the threat of 27 . . . R-Kt8ch and 28 . . . KtxP mate (after 27 P-R4, KtxPch; 28 RxKt, RxR; 29 RxRP Black '-¡as at least a draw).

II 25 BxKt? RxPch; 26 K-Rl, B-B2! 27 P-B4, RxKt with a won game for Black.

However, 24 B-Q4 is not a bad move, if White answers 24 . . . QR-KKt3 with 25 P-Kt3.

If 25 R-R3, Kt-Q7; 26 KR-R1 (forced by the double threat o(; . . . KtxR or . . . Kt-B6ch followed by . . . KtxB), Kt-B5; 27 R-R4, QR-KKt3.

A bit nervous because of the subtle threats for which he must keep a constant lookout, Dr. Euwe misses his cue here. With the simple 26 P-Kt3 ( . . . Kt-Q7; 27 RxB. etc.) White could have maintained .the superior game. _But.,pow Black gets counterplay.

To prevent some such continuation as 27 . . . P-Q5; 28 PxP, P-B5 followed by . . . RxPch.

Black is a P ahead, but his position is so riddled with weaknesses (five isolated Ps!) that passive play holds out no prospects. Hence the text, which is played to confuse White.

With 28 RxP, P-R5; 29 BxP, RxPch; 30 K-Rl (threatening B-Kt3), R(7)-Kt5; 31 R-K5ch, K-

B.1; 32 B-K7ch White could have come out a P ahead.

Preventing Kt-Kt4. And this passed P may become dangerous.

Very tardily—and yet too soon!—White reestablishes material equality. It would have been stronger to develop the KR, for example R-Q.l or R-Ktl.

Beginning a maneuver directed against the hostile K.

After 31 RxP, P-Q6; 32- R-Q5, P-Q7; 33 Kt-Ktl, R-B7; 34 R-Ql, R-B8; 35 RxQP, RxKt; 36 RxR, KtxR; 37 RxB White should win. But Black has a better reply to 31 R.xP in 3.1 .. . PxP; 32 PxP, BxPch and White must answer 33 B-B2

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