Chess Board
[ECO code C33]
Game: Anderssen-Kieseritsky, London 1851 Move Move Here
(KGA:) Bryan Counter-Gambit
"Immortal Game"

Black's QB4(c5) bishop removed White's K-side rook, and he still threatened 19..QxR+ch.
White offers a double rook sacrifice. His K4(e4) Pawn moves to K5(e5), and the Black queen is now cut off from the K-side.
     White  Black
 18. B-Q6!! BxR
 19. P-K5!

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