Chess Board
[ECO code A00]
TRANSPOSITION
VAN'T KRUYS OPG. to BIRD OPG. (Dutch Bird V.)
Black advanced his queen's pawn to the vacant centre to control White's K4(e4).
White transposes into a Bird Opening variation by advancing his King's Bishop's Pawn to KB4(f4), taking control of Black's K4(e5). W-Alt.
    White  Black    Transp.White Black
 1. P-K3   P-Q4	    (1.	P-KB4  P-Q4)
 2. P-KB4	    (2.	P-K3	   )
Continue: Transpose or Undo or Jump or Clear