Czech Variation, Carlsbad Variation

Black answers the Krause Attack's knight recapture by striking with 8...e5, opening the diagonal for the dark-squared bishop and contesting the center. Almost every game continues 9. dxe5, since 9. Bg2 lets Black build pressure with ...Rd8 and ...Be6. The line 9. dxe5 Nxe5 10. Bf4 Nfd7 11. Bg2 g5 is the Morozevich Variation. The name likely recalls Karlsbad 1929, where Capablanca and Vidmar played it. Engines give White a slight edge, though Black scores well online.