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Chess Opening Theory/1. e4/1...d6/2. d4/2...Nf6/3. Nc3/3...Nbd7

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Lion Defence
a b c d e f g h
8a8 black rookb8 black kingc8 black bishopd8 black queene8 black kingf8 black bishopg8 black kingh8 black rook8
7a7 black pawnb7 black pawnc7 black pawnd7 black knighte7 black pawnf7 black pawng7 black pawnh7 black pawn7
6a6 black kingb6 black kingc6 black kingd6 black pawne6 black kingf6 black knightg6 black kingh6 black king6
5a5 black kingb5 black kingc5 black kingd5 black kinge5 black kingf5 black kingg5 black kingh5 black king5
4a4 black kingb4 black kingc4 black kingd4 white pawne4 white pawnf4 black kingg4 black kingh4 black king4
3a3 black kingb3 black kingc3 white knightd3 black kinge3 black kingf3 black kingg3 black kingh3 black king3
2a2 white pawnb2 white pawnc2 white pawnd2 black kinge2 black kingf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 black kingc1 white bishopd1 white queene1 white kingf1 white bishopg1 white knighth1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e4 d6 2. d4 Nf6 3. Nc3 Nbd7

Lion Defence

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This is a rare defence from the many that Black can choose, this is often seen as an oportunity for black to get white out of theory, however, A transposition to the Phildor Defense is very likely (Ex: 1. e4 d6 2. d4 Nf6 3. Nc3 Nbd7 4. Nf3 e5) is the same position as (Ex: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7), even though this defence is rare and not seen often in the top levels, in an over the board game, Stockfish 16 evaluates the Lion Defence as a +0.5, the top engine move being pawn to f4.

Possible Moves

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4. f4 - Anti-Phildor

The name of the variation says it all, this move prevents a transposition to the Phildor Defence, black's most common move and top Stockfish 16 line is e5 (Lion's Cave), white can play Nf3, the main line, or fxe5, a common line for beginner to intermidiate levels, since after dxe5, dxe5 and Nxe5, white can trade queens, but according to Stockfish, even without the ability to castle, the position is drawish (0.0).