A3 opening

R13 C13 Q1 N:on Ra3 Sg7

Most players answer here g7 (star hexa) because the center is said to be important. There other possibilities though : I10 and J11 R13 C13 Q1 N:on Ra3 Bi10 R13 C13 Q1 N:on Ra3 Bj11

These two moves are good too because of template Va (i10) and template IVa (j11), hence Blue is connected to right edge and make it harder for Red to link to Bottom edge.

External link
J. Rydh on openings