Chess
If White to play, he may wish to stop Black's threat of playing 10...Nf4. He can do this by playing 10.g3, or by playing 10.Re1 so that if 10...Nf4 11.Bf1 will preserve the bishop (in this position it is an important defensive piece). However, White may try to plough ahead with 10.c5, the key move on the queenside. ChessBase shows that the number of tournament games with these choices were: