Chess Opening Theory/1. e4/1...f6/2. d4

Barnes Defence Barnes Defence Barnes Defence 2. d4 With this move, White punishes Black's weak move by taking the centre and tactically preventing e5. Black has wasted their chance to stop d4, so White happily plays it. Responses 2...g5?? is the worst response, allowing immediate mate with 3. Qh5#. This is tied for fastest White checkmate with another mate, 1. e4 e5 2. Qh5 Ke7?? 3. Qxe5#. 2...Kf7?! is a joke continuation named the Fried Fox DefenceFried Fox Defense https://lichess.org/opening/Fried_Fox_Defense/e4_f6_d4_Kf7 2026-04-02 lichess.org en-US where Black's king is exposed. After 3. Bc4+, White is clearly better as Black is unable to castle and behind in development. 2...e5 is the most common replyBarnes Defense https://lichess.org/opening/Barnes_Defense/e4_f6_d4 2026-04-02 lichess.org en-US. However, after 3. dxe5, Black has simply lost a pawn as taking back with 3...fxe5?? would be absolutely disastrous due to 4. Qh5+! and White wins a rook after 4...g6 (4...Ke7 leads to Black having to sacrifice material to avoid mate after 5. Bc4+ d5 6. Bxd5+ Qxd5 7. Qxd5++-) 5. Qxe5+ Qe7 6. Qxh8+-, so 3...Nc6 instead is better, transposing into the Hammer Gambit (1. e4 Nc6 2. d4 e5 3. dxe5 f6!?) of the Nimzowitsch DefenceNimzowitsch Defense: Kennedy Variation, Hammer Gambit https://lichess.org/opening/Nimzowitsch_Defense_Kennedy_Variation_Hammer_Gambit/e4_f6_d4_e5_dxe5_Nc6 2026-04-02 lichess.org en-US where after 4. exf6 Nxf6 Black loses a pawn in exchange for quick development. Other moves include: 2...g6 attempts not to fianchetto the bishop on g7, but to play Nh6-f7 without worrying about Bxh6 as Black would take back with Bxh6 and develop the bishop. After 3. Nf3 Nh6 Black scores quite wellBarnes Defense, g6 Nf3 Nh6 https://lichess.org/opening/Barnes_Defense/e4_f6_d4_g6_Nf3_Nh6 2026-04-02 lichess.org en-US. 2...e6 aims to develop the bishop and then place the g8-knight on e7 as f6 is blocked by the pawn. Although not as popular, it is a relatively playable move to develop pieces. 2...Nc6 transposes to the Neo-Mongoloid Defence (1. e4 Nc6 2. d4 f6) of the Nimzowitsch DefenceNimzowitsch Defense: Neo-Mongoloid Defense https://lichess.org/opening/Nimzowitsch_Defense_Neo-Mongoloid_Defense/e4_f6_d4_Nc6 2026-04-02 lichess.org en-US while developing the b8 queenside knight. References