The following is an example of the consequences that may ensue by violating the foregoing principles and strategies.
White Black
1.e4 e5
2.Nf3 d6
3.Bc4 Bg4
Here Black has violated the strategy principle by playing the Bishop instead of the Knight.
4.Nc3 Nc6
5.0-0 Nd4
Black has again played contrary to the principle strategy, in moving the Knight twice during the Opening.
6.Nxe5 dxe5
