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Chess Opening Theory/1. e4/1...b5

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O'Neill Gambit
a b c d e f g h
8a8 black rookb8 black knightc8 black bishopd8 black queene8 black kingf8 black bishopg8 black knighth8 black rook8
7a7 black pawnb7 black kingc7 black pawnd7 black pawne7 black pawnf7 black pawng7 black pawnh7 black pawn7
6a6 black kingb6 black kingc6 black kingd6 black kinge6 black kingf6 black kingg6 black kingh6 black king6
5a5 black kingb5 black pawnc5 black kingd5 black kinge5 black kingf5 black kingg5 black kingh5 black king5
4a4 black kingb4 black kingc4 black kingd4 black kinge4 white pawnf4 black kingg4 black kingh4 black king4
3a3 black kingb3 black kingc3 black kingd3 black kinge3 black kingf3 black kingg3 black kingh3 black king3
2a2 white pawnb2 white pawnc2 white pawnd2 white pawne2 black kingf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 white knightc1 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)

rnbqkbnr/p1pppppp/8/1p6/4P3/8/PPPP1PPP/RNBQKBNR w

Moves: 1. e4 b5
ECO code: B00
Parent: King's Pawn Opening

O'Neill Gambit

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1...b5?

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This is considered a dubious response to 1. e4 because it allows 2. Bxb5, and if White plays accurately, Black does not get sufficient compensation for the sacrificed b-pawn. As a result, the O'Neill gambit is almost never used, and is the least played response to 1. e4. Despite this, there is some try for an advantage with the Lila Attack, where if white does not play carefully they could end up severely disadvantaged.

1. e4 b5 2. Bxb5 Bb7 3. Nc3 f5!?

And here, if white plays 4. exf5? black wins a pawn with 4... Bxg2.

Theory table

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For explanation of theory tables, see theory table and for notation, see algebraic notation.

1. e4 b5
2
O'Neill Gambit Accepted Bxb5 +

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Wikipedia has related information at King's Pawn Game

References

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