Queen's Gambit Declined - Tarrasch - Prague variation - 9.Bg5
1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5
White advances the queen's pawn to d4. Black moves the queen's pawn to d5. White moves the c-pawn to c4.
Black pushes the king's pawn to e6. White develops the knight to c3. Black moves the c-pawn to c5.
White captures on d5 with the c-pawn. Black captures on d5 with the king's pawn. White transfers the knight to f3.
Black develops the knight to c6. White pushes the g-pawn to g3. Black transfers the knight to f6.
White develops the light-squared bishop to g2. Black develops the dark-squared bishop to e7. White castles kingside.
Black castles kingside. White places the dark-squared bishop to g5.