Chess Board
[ECO code D08 > 09] Move Move Move Here Move Here
White's centre QP removed Black's counter KP on K5(e5) - the almost invariable response, inviting a pawn exchange (his QBP being still left en prise).
Black pushes his own Queen's Pawn onward to Q5(d4), contesting QB6+K6(c3+e3) so as to harass White's development for the cost of the pawn.
	White	Black
 1.	P-Q4	P-Q4
 2.	P-QB4	P-K4
 3.	QPxP	P-Q5

WHITE to Move or Undo or Jump or Clear
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