human
What is the sharp variation 9... Re8 10. 0-0 c4?
assistant
The sharp variation 9... Re8 10. 0-0 c4 is a variation of the Modern Benoni. The sharp variation 9... Re8 10. 0-0 c4 received significant attention in the mid-1990s, but after 11. Bxc4 Nxe4 12. Nxe4 Rxe4 13. Bg5 Black has yet to demonstrate clear equality.