Chess Board
[ECO code B02]
TRANSPOSITION
ALEKHINE DEF. to SICILIAN DEF. (Nimzowitsch Var.)
White developed his KKt to support his frontier KP - a rarer move, as failing to attack the knight or take control of QB5(c5) risked a Sicilian in reply.
Black transposes into the Nimzo-Rubinstein variation of the Sicilian Defence by advancing his QBPawn to QB4(c5) to deter 4.P-Q4. B-Alt. 
    White  Black   Transp.White Black
 1. P-K4   Kt-KB3  (1. P-K4   P-QB4   )
 2. P-K5   Kt-Q4   (2. Kt-KB3 Kt-KB3!?)
 3. Kt-KB3 P-QB4   (3. P-K5   Kt-Q4   )
Continue: Transpose or Undo or Jump or Clear