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.A typicalexample of this is the advance of the white pawn to KB6, whichhelps with mating threats.It is instructive to see how the pawnsnakes over via KB4, K5 to KB6.Game No.33Tal-Andersson, Stockholm 1976 (Sicilian Defence)1 P-K4 P-QB4 2 N-KB3 P-Q3 3 P-Q4 P xP 4 N xPN-KB3 5 N-QB3 P-K3 6 B-K2 B-K2 7 0-0 0-0 8 P-B4N-B3 9 B-K3 P-QR3 10 Q-Kl Nx N 11 BxN P-QN4 12R-Q l B-N2 A characteristic middle-game position, which appearsalmost automatically a er the opening moves of the so-calledScheveningen variation.The most important feature of the position isthat White has exchanged a central pawn for a flank pawn, thusgiving Black a pawn majority in the centre (the pawns on his K3and Q3 versus the white pawn on K4).The whole set-up of thepieces determines each player's strategic plan.White will try to drive away the defensive knight on Black's kingside by playing P - K4, K5 and then eventually move the queen orone of the rooks over to the king side for attack.Yet Black also hashis own counter plan; an isolated pawn on White's K5 can become atarget for attack and also Black's pressure on the half-open QB filemust not be underestimated - In short, we have the prospect of adouble-edged game.13 B- B3 White begins his threats: he intendsto follow up with P-K5.13." Q-B2 14 P-K5 P xP 15 P xPN - Q2 Perhaps 1 5.N - Q4 was the lesser evil, but from Q2Black ambitiously aims to liquidate White' s central pawn.16 B x BQ x B 17 N - K4 So far, the moves have followed the gameCheskovsky-Petrushin.The modern chess master has to know histheory; he must always keep himself in the picture - unless he wantsto waste his time going over well known territory.17.QR -Ql18 R - Q3 The most energetic move.The mighty rook has his nextdesigns on the king' s side.Tal was satisfied that the pawn on K5could be defended by 1 8 Q - K2 or 18 R- B4.The black knight onQ2 can not leave its post because of N - B6 + ! 136 Game No.3318.Q-B3!75How is White's pawn on QB2 to be defended? A er 19 P-B3,the bishop on Q4 is pinned by 19.N xP.If 19 R-QB3 therefollows the favourable centralisation of the black queen by 19.Q - Q4, and finally, if 19 Q - K2 Black can simplify adequately with19.N - B4.What would you play next?* * *19 R-KN3!White offers a pawn, and what is more important, voluntarilyremoves the guard on the bishop! 19 ".Q x BP It is not di cult tosee that 19.B-R5 would have been catastrophic for Black,because the rook sacrifice discovers an attack on the bishop: 19.B - R5 20 R x P + K x R 21 Q x B with the terrible threat of N - B6.20 Q - K3 Innocently threatening 21 Q - R6, which Black parrieswith his next move.20 " " " Q -Q74 What is strongest here? Spend some time on this!21 P-QNTal was critical of this move, although White still maintains hispositional advantage.White simply thought that a er the forcedexchange of Black's king bishop, and the further weakness.P - KN3, the game would just win itself.However, the position didnot turn out to be quite as simple as that, and White had to win thegame a second time.21 ".Q-Q4Not, however, 21.Q-N5, because of 22 P-QR3 ! diverting Game No.33 137the queen from attacking the bishop.22 N + BxN 23 Px B-B6P -N3 White has now forced on Black an unfavourable pawnstructure around his king; the thorn in his flesh on KB3 paralysesthe king's side, the black squares are very weak and KR3 just invitesthe queen in to threaten mate.at is happening in this position?* * *Let us look at how Tal assessed the situation, 'At this point, Ithought long and hard.The attacking machinery can be seen clearlyenough - the question is, how best to operate it.At first I intendedto play 24 R-N5, but a er 24.Q-Q3 (24.P-K4 25RxP!) the rook is not very well placed.Then the following linereally looked tempting 25 R-N4 P-K4! 26 Q-R6 NxP 27R-R4 KR-KI? 28 RxN QxR 29 QxP+ K-Bl 30 B-B5+!R-Q3 (or R-K2) 31 Q-R8+ winning a piece - but 27.N-R4 (instead of 27.KR-K l) refutes White's attacking idea.Yet something inside told me that there simply must be a win in thisposition somewhere, and indeed.' 24 R Immediately-N4!threatening 25 Q-R6 24.K-RlQ75 The alternative was 24.P -K4.Analyse this move, please.Now try to find ite's next bombshell!* * *25 B-N6!This is the point! This surprising and ingenious move either drives Game No.33138away the enemy queen from the fi h rank or captures her.Theknight on Q2 is overloaded - it dare not concede the control of KB3(25.NxB 26 Q-R6) 25 ".R-Bl 26 Q-R6 R-KNl 27R-Q4! Because of the mating threat of 28 QxRP+, followed by29 R-R4, the queen may not abandon the fi h rank, so Blackexchanges her for rook and knight.27." " N xB 28 R xQ N xR 29R-B3 R-B6 30 RxR NxR* * *31 Q-K3The queen has done her work on the king's side.Now she attendsto the struggle on the queen's side.31.P-N5 Black should havemade life most di cult by playing 31
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