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Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Nc3/3...Nf6

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Four Knights Game
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 pawne7 black kingf7 black pawng7 black pawnh7 black pawn7
6a6 black kingb6 black kingc6 black knightd6 black kinge6 black kingf6 black knightg6 black kingh6 black king6
5a5 black kingb5 black kingc5 black kingd5 black kinge5 black pawnf5 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 white knightd3 black kinge3 black kingf3 white knightg3 black kingh3 black king3
2a2 white pawnb2 white pawnc2 white pawnd2 white pawne2 black kingf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 black kingc1 white bishopd1 white queene1 white kingf1 white bishopg1 black kingh1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6

Four Knights Game

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This is the classical Four Knights' Game. One of the beginning principles of the opening that the beginners learn is "Knights before bishops", and thus dogmatic followers of this principle stick to this system. All four knights have been developed (hence the name), leading to a symmetrical position. The classical players like Maroczy, Capablanca, Lasker, Tarrasch, and Rubinstein would play the Symmetrical Variation, 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5, when Black should sever the symmetry with 7...Bxc3 (if 7...Bg4, then 8. Bxf6 Qxf6? (8...gxf6 is better, but leaves White with the better game because of Black's weakened kingside) 9. Nd5 Qd8 10. Bxc6 bxc6 11. Nxb4, when White is up a piece) 8. bxc3, with an even game. However, Rubinstein's 4...Nd4 and Marshall's 4...Bc5 are sharp alternatives. The Scotch Four Knights begins with 4.d4, and can lead to the enterprising Belgrade Gambit after 4...exd4 5.Nd5!?, a highly tactical system which often runs 4...exd4 5. Nd5 Nxe4 6. Bc4 Be7 7. Nxd4 O-O 8. Nb5 Bc5 9. O-O Nxf2 11. Qh5. Black is doing all right, but some careful play is required.

Theory table

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For explanation of theory tables, see theory table and for notation, see algebraic notation..
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6

4 5
Symmetrical Variation Bb5
Bb4
O-O
O-O
=
Scotch Four Knights d4
exd4
Nxd4
Bb4
=
Belgrade Gambit ...
...
Nd5
Nxe4
=
Italian Four Knights Bc4
Nxe4
Nxe4
d5
=
Glek Variation g3
d5
exd5
Nxd5
=
Halloween Gambit Nxe5
Nxe5
d4
Nc6
=/+

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References

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de Firmian, Nick. Modern Chess Openings, 15th edition. New York, NY: Random House, 2008.