Chess Board
[ECO code C01]
FRENCH DEFENCE
(The) Longfellner System
White's KP+QP formed a weak classical centre.
Black pushes his Queen Pawn out a single square to Q3(d6) and partially frees his QB but blocks his previously open KB diagonal. Inferior (weak) but defensively sound, the Longfellner System teaches safe opening pawn moves to beginners! B-Alt.
    White  Black   Equiv. Pillsb. route
 1. P-K4   P-K3	    (1.	P-K4   P-Q3)
 2. P-Q4   P-Q3	    (2.	P-Q4   P-K3)
Example ends: Undo or Jump or Clear