1.c4 e5 - This line leads to active, tactical play. Typically both sides bring out their knights (2.Nc3 Nf6 3.Nf3 Nc6... Four Knights variation) and then either 4.e3 or 4.g3 followed by 4...Bb4 and then the fireworks begin. Warning! If you attempt to attack before bringing out both your knights you are likely to fall into a trap unless you spend some time preparing your variation.
I know how to reply after E4 and D4, but what after C4. All I know to prepare for C4 is
HELP!