The main line King's Indian Defence, Four Pawns Attack

1 main line

1.1 old main line 9...re8
1.2 new main line 9...bg4
1.3 white varies on move 7, 8 or 9
1.4 sacrifice 7...b5

the main line

the main line of 4 pawns attack after 6...c5 7.d5 continuing 7...e6 8.be2 exd5 9.cxd5 gives black choice of old main line 9...re8 or new main line 9...bg4.

old main line 9...re8

highly tactical possibilities abound in critical position occurs after 10.e5 dxe5 11.fxe5 ng4 12.bg5, position perhaps better avoided black. after 12...qb6 13.0-0 nxe5 14.nxe5 bxe5 15.qd2 bf5 white not able achieve significant advantage.

new main line 9...bg4

a common-sense move idea of exchanging bishop knight , taking energy out of white s e5 attacking plan. development of bishop frees black s queenside smooth development , active play. invariably, development continues 10.0-0 nbd7 when white faces possibly of kicking bishop h3 or delaying re1 first. in game jesus nogueiras–garry kasparov, white opted immediate kick, 11.h3 bxf3 12.bxf3 re8 in game drawn.

white varies on move 7, 8 or 9

white can vary 7.dxc5 or 7.be2; allows black equalize accurate play.
of various alternatives @ move eight, 8.dxe6 opening d5-square has gained interest. reply 8...bxe6 leaves white possible f5 push @ appropriate moment, 8...fxe6 played when white has choice of solid 9.be2 or aggressive 9.bd3.
9.exd5. although once common, f4-pawn looks out of place , white s weakness on e4 clear. white varying 9.e5 has logic quicken centre play, reply 9...ne4 seems adequately halt plan.

the sacrifice 7...b5

having similar ideas benko gambit, b5 push remains uncharted. after 8.cxb5 (8.e5 considered) 8...a6, white has choices between possibility of taking a-pawn, or supporting pawn on b5. more common response support 9.a4.