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ii :!0.Nh4, Black would simply exchange (30 Bxh4 31 .Rxh4) and the game would then take on a somewhat rigid aspect. Lasker, wisely avoids this move and seeks to preserve whatever latent dynamic force is in the position, even though little remains.

Wh^te intends to play the Knight to e3 and wishes to hold the move f4 in readiness should Black play ...Bg5 (Lasker).

34...NC8 35.Kg2 Qd7 36.Kh1 Ne7 37.Rh2 Rb7 38.Rf1 Re8 39.Ne3 Ng8 40.f4 Bd8 41.Qf3

Lasker has succeeded in carrying outf4 under circumstances favorable to himself. Black's pieces must keep on the watch against the threat of an invasion by Nf5 and are less well posted in the case of an attack on the Queenside. We may say that Lasker has laid the Kingside under siege in order to bring the enemy pieces out of contact with their own Queenside and will now roll up the Queenside and thus score a double advantage. Definite weaknesses are to be created, and in addition his Bishops are to get room for maneuvering. Play might go c4 ...b4 Bc2 followed by Qd1 and Ba4.

The decisive error. The right course, as Lasker pointed out in the book of the Congress, was 43...Bxe3 44.Bxe3 Qxb5 followed by ...a4 and ...Ra8 and Black's game is tenable.

44.Nf5 Qd7 45.Qg4 f6

44.Nf5 Qd7 45.Qg4 f6

The Knight on f5 can no longer be driven away. Black now has evident weaknesses on both wings and Lasker exploits them without any particular trouble.

46.BC2 Bc5 47.Rai Reb8 48.Bc1 Qc7 49.Ba4 Qb6 50.Rg2 Rf7 51.Qe2 Qa6

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