Chess Board
[ECO code D05]
QUEEN'S PAWN GAME
(The) Colle System
White develops his Queen's Knight to Q2(d2) to pressure his QB4+K4(c4+e4) centre - a Colle Sys..
Black replies by developing his King's Bishop to Q3(d6) - similar to White's - and can now castle.
    White  Black	White  Black
 1. P-Q4   P-Q4	     6.	QKt-Q2 B-K2
 2. Kt-KB3 Kt-KB3
 3. P-K3   P-K3
 4. B-Q3   P-B4
 5. P-B3   Kt-B3
Example ends: Undo or Jump or Clear