insufficient. So Black must first prevent back-rank mates.
In order to answer 24 P-R4 with 24 . . . N-B4 or the equally strong line given by Euwe: 24 . . . N-Q5 25 BxN RxB26 N-B4 BxP!27PxB R-KN5+ 28 K-Bl Q-Rl! etc. So White must allow the advance of Black's KRP which soon creates serious mating threats.
Also insufficient is 26 P-B3 N-Q5 27 BxN RxB threatening 28 . . . Q-Q4.
Or 27 Q-N4 R-K5! 28 QxR N-K7+ 29 K-Bl RxR+ 30 KxN RxR. After the text move Black could win at once by 27 . . . N-B6+ 28 K-Rl RxR 29 RxR Q-Rl, but in the rest of the game both sides commit errors.
28 BxN BxB
White could still hold the position with 30 R-Bl!
The next game is interesting because, although both sides have pieces in the centre, Black outnumbers White in pieces which control the central squares.
84 Chekhover- Pirc
Moscow 1935, Queen's Gambit
1 P-Q4 P-Q4 2 PQB4 P-QB3 3 N-KB3 N-KB3 4 P-K3 P-K3 5 B-Q3 Px P 6 Bx BP QN-Q2 7 N-B3 P-QN4 8 B-Q3 P-QR3 9 P-K4 P-N5 10 N-K2 10 N-QRif 10 ... P-B4 11 P-K5 N-Q4 1 i 0-0 B-N2 13 N-N3 Px P14 N-K4 P-R3! 15 B-Q2 P-N4? 16 NxQP? Much stronger is 16 Q-R4! but White is counting on the fact that he can afford to give up his K.P in order to obtain an attack against the enemy king in the centre. As-it turns out, however, it is not so much the pawn that matters as the control that Black now obtains over his K4 square.
A fascinating position has arisen in which all four knights are in the centre! However, whereas the black knights are well supported by the bishops, and Black's queen is also directly aimed at the centre (the immediate threat is 20 . .. QxN 21 BxKNP+ PxB 22 QxQ N-KB6+ etc.), there is only the white KR at the moment which is supporting the central pieces.
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