Chess Board
[ECO code C46] Move Move Here
TRANSPOSITION
THREE KTS. OPG. to SCOTCH FOUR KTS.
White's QPawn advance to the centre freed his QB and doubled the threat against Black's KP.
Black develops a King's Knight to KB3(f6) counter threat against White's KP, but risks a QKt pin or else a centre P recapture that exchanges queens. B-Alt.
     White   Black
 1.  P-K4    P-K4
 2.  Kt-KB3  Kt-QB3
 3.  Kt-B3   P-Q3    Main via S-4Kts
 4.  P-Q4    Kt-B3   Alt.via Philidor
WHITE to Move or Undo or Jump or Clear
 
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