C57: two knights defence, Fritz, Gruber variation

C57 Sub-variants:

• Two knights defence
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5
• two knights defence, Wilkes Barre (Traxler) variation
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Bc5
• two knights defence, Ulvestad variation
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 b5
• two knights defence, Fritz variation
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nd4
• two knights defence, Fritz, Gruber variation
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nd4 6. c3 b5 7. Bf1 Nxd5 8. Ne4
• two knights defence, Lolli attack
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. d4
• two knights defence, Pincus variation
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. d4 Bb4+
• two knights defence, Fegatello attack
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7
• two knights defence, Fegatello attack, Leonhardt variation
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7 Kxf7 7. Qf3+ Ke6 8. Nc3 Ncb4 9. Qe4 c6 10. a3 Na6 11. d4 Nac7
• two knights defence, Fegatello attack, Polerio defence
  1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7 Kxf7 7. Qf3+ Ke6 8. Nc3 Nce7