Blackburn's mate (also known as "Blackburn's trap") is named after English chess player Joseph Henry Blackburn (1841-1924) one of the strongest players of the 19th century. The history of this mate is interesting because it arose from a practical game. Blackburn used this combination in several of his games and it became particularly famous after a game against an unknown amateur in 1876. The mate requires the interaction of two bishops and a knight to checkmate the enemy king on the edge of the board. An opponent's piece or pawn blocks the king's only escape route. One of the bishops protected by the knight declares mate on a square adjacent to the king. The other bishop controls the diagonal. The knight controls the square of the attacking bishop's color next to the king (which may also be occupied by an opponent's piece or pawn). The opponent's piece blocks their king's retreat paths along the edge of the board. Blackburn was known for his aggressive combinational style of play and this mate well reflects his approach to chess. He often gave simultaneous exhibitions and used similar tactical strikes against amateurs.