Chess Board
[ECO code C52]
EVANS GAMBIT - "Evergreen Game" (Var.)
Black's checked king on K1(e8) moved to KB1(f8) and White still had to give further check with every move to avoid defeat by 21..QxKtP++mate.
White's K7(e7) Rook to K3(e3) with discovered check wins Black's queen, and will lead to victory.
     White  Black
 17. Kt-B6!! ch PxKt
 18. PxP    R-Kt1
 19. QR-Q1!! QxKt
 20. RxP! ch K-B1
 21. R-K3 ch
Example ends: Undo or Jump or Clear