Chess Board
[ECO code A07]
RETI TRANSPOSITION
BARCZA SYSTEM to QPG (towards Catalan Opg.)
Black's KP push tripled his Q4(d5) control and freed his KB but blocked his QB, offering a Catalan game.
White's Queen's Pawn to the centre frees his QB and controls QB5(c5). Arising equally from a QP Game, it may yet transpose into a Catalan. W-Alt.
    White  Black    Transp.White Black
 1. Kt-KB3 P-Q4	    (1.	P-Q4	P-Q4  )
 2. P-KKt3 Kt-KB3   (2.	Kt-KB3	P-K3  )
 3. B-Kt2  P-K3	    (3.	P-KKt3	Kt-KB3)
 4. P-Q4	    (4.	B-Kt2	      )
Continue: Transpose or Undo or Jump or Clear