Chess Board
[ECO code B21]
SICILIAN DEFENCE
Philidor Variation
White develops his King's Knight to KB3(f3) to take control of Q4(d4) and prevent 3..Q-R5(h4)+ch
Black advances his Queen's Pawn to Q4(d5) to attack White's KP and has a slightly better centre, for a satisfactory game despite 4.P-Q3 or 4.P-K5.
	White	Black
 1.	P-K4	P-QB4
 2.	P-KB4	P-K3
 3.	Kt-KB3	P-Q4
Example ends: Undo or Jump or Clear