Chess Board
[ECO code A43]
(OLD) BENONI DEFENCE
The Blockade Variation (alt. route)
White took the opportunity to advance his king's pawn to the centre in support of his QP.
Black pushes his King's Pawn out to K4(e5) (releasing his KB while leaving his QB free), adopting the Blockade (or Semi-Benoni) variation to prevent P-K5 against his own likely ..Kt-KB3. B-Alt.
     White   Black
 1.  P-Q4    P-QB4
 2.  P-Q5    P-Q3
 3.  P-K4    P-K4  Main 3B,2B route
Example ends: Undo or Jump or Clear