Tournament 2006 December Sicilian Defence, Kan Variation / 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6
With 4...a6, Black stops the White knight from jumping to b5 and prepares an eventual ...b5 advance. The variation retains maximum flexibility. Black waits for White to move before choosing a plan.