411 REFERENCE · Wikibooks
Chess Opening Theory/1. f4/1...e5/2. fxe5/2...Nc6/3. Nf3/3...g5/4. d4/4...g4
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Bird's Opening rd bd qd kd bd nd rd pd pd pd pd pd pd nd pl pl pd nl pl pl pl pl pl pl rl nl bl ql kl bl rl
4...g4
This move continues the plan of Black's 3...g5. He is kicking the f3-knight away. Houdini recommends the passive-looking Ng1 d6 e4!, giving back the pawn. After dxe5 d5 Nce7 Nc3 f5 (Otherwise white gets a bind on the f-file), Bg5 h6 Bh4 Bg7 Bb5+ Kf7 Bc4 Qd6 and both exf5 and Bb5 are good for white. Lakdawala, Cyrus. Bird's Opening: Move by Move. Everyman Chess, 2015.
Theory table
+567Ng5
d6e4
h6?!Nxf7!
Kxf7 +/-Ng1!? +/-
References