1. Nf3 c5 2. c4 Nc6 3. Nc3 g6 4. e3 Nf6 5. d4 cxd4 6. exd4 d5 7. cxd5 Nxd5 8. Qb3 Nxc3 9. Bc4 Nd5 10. Bxd5 e6 11. Bxc6+ bxc6 12. O-O Qd5 The Black queen takes up a good central square. If I were White here, I would really like to force the black queen away from this square. However, White has exchanged his light-squared bishop so it will be hard to achieve this. He can probably do so by an attack from the white knight or if a rook lands on c5 or e5. So these are two possible things that White should be thinking about. Other plans for White involve swapping off the dark-squared bishops, after which Black's weaknesses will become more difficult to defend. Another option is to start an attack on the c6-pawn. Black on the other hand has some pluses. The bishop-pair is an obvious one and if he can ever play ...c5 his light-squared bishop will find a great diagonal along a8-h1. So right now, White must stop the ...c5 break. 13. Bf4! In positions such as this, White would like to retain queens; this is due to a couple of factors: 1) After an exchange of queens, two are bishops generally better than a bishop and a knight. 2) It's harder to create threats on Black's dark squares and following this his king, without queens on the board. However, as we shall see, if Black now exchanges on b3, he will find it hard to defend his c6- and a7-pawns. Black seems to have fewer problems against other moves (...).