Chess Board
[ECO code C52] Anderssen-Dufresne, Berlin 1852
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EVANS GAMBIT - "Evergreen Game"
Black's KR4(h5) queen captured White's knight on KB6(f3), for 20..QxKtP++mate, leaving White having to give check with every move to avoid defeat.
White's Rook on K1(e1) captures Black's pinned knight on K7(e7) and offers a sacrificial check.
     White  Black
 17. Kt-B6!! ch PxKt
 18. PxP    R-Kt1
 19. QR-Q1!! QxKt
 20. RxP! ch
BLACK to Move or Undo or Jump or Clear
 
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Chess Board

BLACK moves King:

K-Q1 (d8) or K-B1 (f8) ?

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