Czech Variation, Wiesbaden Variation

The Wiesbaden Variation, 6...e6, answers the Krause Attack by preparing ...Bb4. After 5. a4, White can no longer contest that square with a pawn. The usual reply is 7. f3, aiming for e4. In the Sharp Line, 7. f3 Bb4 8. e4, Black must rely on piece activity and sometimes gives up a piece to break White's center. Against 7. Nxc4, Black has the counterstrike 7...c5. The name comes from the games Bogoljubov played at Wiesbaden in his 1929 match with Alekhine.