Chess Board
[ECO code C23] Move Move Here
(CLASSICAL) BISHOP'S OPG. - Philidor Var.
(to) Pratt Variation
White's KP on K5(e5) took the knight on KB6(f6), leaving an open K-file and starting a piece exchange.
Black's rear doubled QPawn takes the light bishop on QB5(c4). [Compare in a Max Lange A. line]
    White  Black	White  Black
 1. P-K4   P-K4	     6.	PxKt   PxB
 2. B-B4   B-B4
 3. P-QB3  Kt-KB3
 4. P-Q4   PxP
 5. P-K5   P-Q4
WHITE to Move or Undo or Jump or Clear
 
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