 Complete the following phrase:  The most common fourth move for White, which leads into the main lines of the Berlin, is 4. 00. The typical continuation is ...Nxe4 5. d4 Nd6 6. Bxc6 dxc6 7. dxe5 Nf5 8. Qxd8 Kxd8 sometimes called the lHermet variation, which was played in all four Berlin games of the 