English - symmetrical - Rubinstein system
1. c4 c5 2. Nc3 Nf6 3. g3 d5 4. cxd5 Nxd5 5. Bg2 Nc7
White pushes the c-pawn to c4. Black plays the c-pawn to c5. White develops the knight to c3.
Black develops the knight to f6. White plays the g-pawn to g3. Black moves the queen's pawn to d5.
White captures on d5 with the c-pawn. Black captures with the knight on d5. White develops the light-squared bishop to g2.
Black transfers the knight to c7.