Chess Board
[ECO code D00]
QUEEN'S PAWN GAME
(to) Colle System
Black's QKt to QB3(c6) supported ..P-K4 without blocking his QB in.
White develops his King's Knight to KB3(f3) to stop 5..P-K4 with a Colle System (rather than by a 5.P-KB4 Stonewall). W-Alt.
    White  Black	White  Black
 1. P-Q4   P-Q4	     5.	Kt-KB3
 2. P-K3   Kt-KB3
 3. B-Q3   P-B4
 4. P-QB3  Kt-B3
Example ends: Undo or Jump or Clear