Chess Board
[ECO code C01]
TRANSPOSITION
FRENCH DEF. (Diemer-Duhm G.) to CARO-KANN DEF.
White advanced his QBP to QB4(c4) leaving his KP en prise - the unorthodox (ie. rare) Diemer-Duhm Gambit, which Black usually accepts.
Black sometimes declines the gambit and pushes his QBPawn out to QB3(c6) instead, transposing into the English line of a Caro-Kann Def. B-Alt.
    White  Black    Transp.White Black
 1. P-K4   P-K3	    (1.	P-K4   P-QB3)
 2. P-Q4   P-Q4	    (2.	P-QB4  P-K3 )
 3. P-QB4  P-QB3    (3.	P-Q4   P-Q4 )
Continue: Transpose or Undo or Jump or Clear