The Slav Defense is a solid response, although many variations are very tactical. If Black plays both ...c6 and ...e6 (in either order), the opening takes characteristics of both the Slav and the Orthodox Defense and is classified as a Semi-Slav Defense. The Chigorin Defense takes the game away from the normal positional channels of the QGD, and has been favoured by Alexander Morozevich at the top level; it appears to be playable for Black.