This is cutting edge theory nowadays. White delays the capture of the bishop as long as she can, in order to force a concession.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4 Kosteniuk is the first one to change the \"plate.\" 3... f8c5  4. d2d3  4... g8f6  5. b1c3  5... h7h6  6. h2h3  6... d7d6  7. c3a4  7... c5b6  8. a2a3 Quite a topical line. We have recently annotated a topical game from the World Team Championship's semifinals. 8... c8e6  9. c4e6  9... f7e6  10. e1g1  10... e8g8 