411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...Nf6/2. c4/2...g6/3. Nc3/3...Bg7/4. e4/4...d6/5. f4
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
King's Indian Defence rd nd bd qd kd rd pd pd pd pd pd bd pd pd nd pd pl pl pl pl nl pl pl pl pl rl bl ql kl bl nl rl
King's Indian Defence
5. f4
The Four Pawns Attack is the most aggressive line for White in the King's Indian. White creates a massive pawn centre and has full control over the middle of the board ... for now. This is a dangerous line for Black, and if they don't play correctly, they will be knocked off the board by White's advancing army. However, if Black can survive the initial onslaught, they will have the better game since White will have many weak squares in their camp that their pawns can't defend. For this reason, the Four Pawns Attack isn't seen frequently at the highest levels of chess, although it's still very viable at the amateur level.
Theory table
.
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4
Four Pawns Attack
...O-O
Nf3c5
d5e6
Be2exd5
=∞
References
King's Indian Defence, Four Pawns Attack