411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...d5/5. exd5/5...Nd4/6. c3/6...b5/7. Bf1/7...Nxd5/8. Ne4/8...Qh4/9. Ng3
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Two Knights Defence:Fritz variation
9 Ng3 The Knight comes to add protection against the Black Queen. Black's Knight on d4 is now vulnerable, but Black having more development can aggressively create threats. The choice is to move the d4 Knight or create further complications, for a long time 9...Bg4 was consider good but later analysis has indicated that with correct play White has a clear plus.
Theory table
1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 b5 6.Bf1 Nd4 7.c3 Nxd5 8.Ne4 Qh4
9
10
11
12
Ng3Nc6
Bxb5Bb7
O-OO-O-O
∞
...Ne6
Bxb5Kd8
d4Bb7
dxe5Kc8
+/-
...Bb7
cxd4O-O-O
Be2Nf4
O-ORxd4
+/-
...Bg4
f3e4
cxd4Bd6
Bxb5+Kd8
+/-
References
Two Knights Defence