Chess Board
[ECO code C41] Move Move Here
TRANSPOSITION
PHILIDOR DEF. (Jaenisch C/A) to SCOTCH FOUR KTS.
White's queen's knight to QB3(c3) defended his KP.
Black also develops his Queen's Knight to QB3(c6) so as to defend his KP, but risks either a QKt pin (the Ruy Lopez, Steinitz D.) or a centre pawn recapture that also exchanges queens. B-Alt.
     White   Black
 1.  P-K4    P-K4
 2.  Kt-KB3  P-Q3
 3.  P-Q4    Kt-KB3  Main via S-4Kts
 4.  Kt-B3   Kt-B3   Alt. 3Kts route
WHITE to Move or Undo or Jump or Clear
 
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