Chess Board
[ECO code C21]
TRANSPOSITION
CENTRE GAME to NIMZOWITSCH DEFENCE
White's QP intended to break open the centre.
Black transposes into a variation of the irregular (ie. rarely played) Nimzowitsch Defence by developing his Queen's Knight to QB3(c6), defending his KP and attacking White's QP to draw it forward. B-Alt.
    White  Black    Transp.White Black
 1. P-K4   P-K4	    (1.	P-K4   Kt-QB3)
 2. P-Q4   Kt-QB3   (2.	P-Q4   P-K4  )
Continue: Transpose or Undo or Jump or Clear