Center game

[ center game ] e4,e5,d4,exd4

[ center game ] e4,e5,d4,exd4,Qxd4

[ center game ] e4,e5,d4,exd4,Qxd4,Nc6

[ center game, Hall Variation ] e4,e5,d4,exd4,Qxd4,Nc6,Qc4

[ center game, Paulsen attack ] e4,e5,d4,exd4,Qxd4,Nc6,Qe3

[ center game, Charousek Variation ] e4,e5,d4,exd4,Qxd4,Nc6,Qe3,Bb4+,c3,Be7

[ center game, l'Hermet Variation ] e4,e5,d4,exd4,Qxd4,Nc6,Qe3,f5

[ center game, Berger Variation ] e4,e5,d4,exd4,Qxd4,Nc6,Qe3,Nf6

[ center game, Kupr?)???k Variation ] e4,e5,d4,exd4,Qxd4,Nc6,Qe3,Nf6,Nc3,Bb4,Bd2,O-O,O-O-O

[ center game Kieseritsky Variation ] e4,e5,d4,exd4,Nf3,c5,Bc4,b5