Mate in 4 Puzzle, Theme: Discovered Check checkmatesblog Updated: May 21, 2016, 12:16 PM | 2 This is a mate in 4 puzzle. This checkmate is played in a game from last year. The theme of this checkmate is discovered check: Black to move, checkmate in 4: Did you solve this puzzle? And did you like it? Let it know in the comments if you want.