Chess Board
[ECO code A05]
TRANSPOSITION
BARCZA SYS. to ENGLISH OPG. (Anglo-Indian Def.)
Black posted his KKtPawn on KKt3(g6) shadowing White (and often continues to do so until White decides on P-Q3 or P-Q4).
White transposes lines, advancing his QBPawn to QB4(c4) early (perhaps planning Kt-QB3 behind it), and contests Q5(d5). W-Alt.
    White  Black    Transp.White Black
 1. Kt-KB3 Kt-KB3   (1.	P-QB4  Kt-KB3)
 2. P-KKt3 P-KKt3   (2.	Kt-KB3 P-KKt3)
 3. P-B4	    (3.	P-KKt3	     )
Continue: Transpose or Undo or Jump or Clear