1. ... e5
2. d4 ...
(a) Black Defends e5-pawn:
Tends not to be a good strategy -- better for black to attack white's d pawn.
(a.i) 2. ... d6
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3. dxe5 dxe5 4. Qxd8+ Qxd8
black loses ability to castle
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(a.ii) 2. ... Bd6
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3. dxe5 Bxe5 4. Nf3 Bf6 5. e5 Be7 6. Bc4
leaves white with control of the centre and more pieces developed
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(a.iii) 2. ... Nc3
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3. dxe5 Nxe5 4. Nf3 Nxf3+ 5. Qxf3
leaves black with no developed pieces
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(b) Black Captures d4-pawn
2. ... exd4!
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(b.i) 3. Qxd4 ... Centre Game
3. ... Nc6! 4. Qe3 Nf6
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5. Nc3 Bb4
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6.Bd2 0-0 7. 0-0-0 Re8!
Outcome is even: White has more control of centre & opportunity to attack on the Kingside. Black has option to attack e4-pawn & White's Queen.
?graphic
5. e5 ...
attacking the black knight not productive for white:
5. ... Nd5 6. Qe4 Nb4
black in a good position
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5. ... Ng4 6. Qe2 d6! 7. exd6+ Be6 8. dxc7 Qxc7
black sacrifices a pawn to gain superior development
(b.ii) 3. c3 ... Danish Gambit
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3. ... dxc3 4. Nxc3
White sacrifices a pawn in order gain the lead in development.
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2. f4... King's Gambit
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(a) King's Gambit Accepted
2. ... exf4 3. Nf3 g5
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4.Bc4 g4 5. 0-0 gxf3 6. Qxf3
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(b) King's Gambit Declined
2. ... Bc5
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2. ... d5
2. Nf3 ...
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(a) 2. ... Nf6 Petroff (or Russian) Defence
3.Nxe5 d6!
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4.Nf3 Nxe4 5.Qe2 Qe7 6.d3 Nf6 (symmetric)
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7.Bg5 Qxe2+ 8.Bxe2 Be7
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(b) Ruy Lopez/Scotch
2. ... Nc6
3. Bb5 Ruy Lopez
3.d4 exd4
4.Nxd4 Scotch Game