THE MODERN LINE 5. e3 g6
STRATEGY 1--White plays a4 (Black allows White to play a4), Black counters rapidly by a central counter ..e6 :Normal benko strategy with 5...g6, ...d6,...Nbd7, ...Qa5...Ba6 (quueenside play) is replaced by a central counter attack with e6,d5 : Black counters with ...e6 , remove the pawn on d5 and occupation of the centre by ...d5 , White can defend d5 (by e4, Bc4...) or exchange dxe6 and prevent ...d5 .Counterplay at the queenside with moves a4, Nb5, and Ra3, the White structure becomes very secure.
STRATEGY 2--White plays e4 to support d5 so Black opens e-file by ...e6
STRATEGY 3--White plays e4 and a4 , Black plays the normal strategy with d6 ( 5...g6, ...d6,...Nbd7, ...Qa5...Ba6 quueenside play)
Line :
- the main line with 5. e3 g6 6. Nc3 Bg7 7. Nf3 O-O 8. a4 e6 where Black counters with ...e6 , remove the pawn on d5 and occupation of the centre by ...d5.
- the line with 5. e3 g6 6. Nc3 Bg7 7. a4 where White delays he development of Ng1