Chess Board
[ECO code C41]
PHILIDOR'S DEFENCE
Hanham's Defence

Black's queen to QB2(c7) heralded a Q-side push.
White's KRPawn to KR3(h3) prevents an eventual QB pin against his Kt+Q and he has a better (ie. more mobile) game due to Black's KB being restricted.
    White  Black	White  Black
 1. P-K4   P-K4	     6. Kt-B3  P-KR3
 2. Kt-KB3 P-Q3	     7.	P-QR4  KKt-B3
 3. P-Q4   Kt-Q2     8.	Q-K2   0-0
 4. B-QB4  P-QB3     9.	B-Kt3  Q-B2
 5. 0-0    B-K2	    10.	P-KR3

Example ends: Undo or Jump or Clear