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Chess Opening Theory/1. e4/1...e5/2. d4/2...exd4

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Centre Game
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 pawnc7 black pawnd7 black pawne7 black kingf7 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 kingc5 black kingd5 black kinge5 black kingf5 black kingg5 black kingh5 black king5
4a4 black kingb4 black kingc4 black kingd4 black pawne4 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 black kinge2 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/pppp1ppp/8/8/3pP3/8/PPP2PPP/RNBQKBNR w

Moves: 1. e4 e5 2. d4 exd4
ECO code: C21–C22
Parent: Open Game

Centre Game

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Black goes in the direction of the Centre Game by capturing the e-pawn.

White's responses

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The usual move is 3. Qxd4.

3. c3 is the Danish Gambit.

3. Nf3, the Kieseritzky variation, often leads to several transpositions. Black can transpose to the Scotch with 3...Nc6 or 3...Bb4+, to the Philidor with 3...d6, to Petrov's Steinitz variation with 3...Nf6, or to the Lewis Gambit of the Bishop's Opening with 3...Bc5 (followed by 4. Bc4 Nf6). An independent line is 3...Bc5 4. Nxd4 Nf6.

Theory table

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1. e4 e5 2. d4 exd4

  3 4 Evaluation Notes
Center Game Qxd4
Nc6 		Qe3
Nf6 		=
Danish Gambit c3
dxc3 		Bc4
Nf6 		=
Scotch Game Nf3
Nc6 		Nxd4
Bc5 		=
Petrov's Defence Nf3
Nf6 		e5
  		Steinitz variation of Petrov's. More commonly: 1. e4 e5 2. Nf3 Nf6 3. d4 exd4
von der Lasa Gambit Bc4
Nf6 		Qxd4
Bb4+ 		=
Urusov Gambit Bc4
Nf6 		Nf3
Nxe4 		=
Halasz Gambit f4
 

References

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