Turton doubling
Encyclopedia
Turton doubling is a manoeuvre in chess
in which a piece moves along a line (rank, file or diagonal), then a similarly-moving piece moves onto the same line in front of it, then this second piece moves again along this line, in the opposite direction to that of the first. Use of the term is effectively limited to the field of chess problem
s.
The idea can be understood in reference to the problem to the right, the first to demonstrate the manoeuvre, composed by its eponym, Henry Turton. A mate in three, the solution is 1.Bh8 (threatening 2.Qa3#) 1...b4 2.Qg7 Ra8 (defending against 3.Qa7#) 3.Qxb2#. The bishop moves along the diagonal a1-h8, then the queen moves onto that same diagonal, then the queen moves again in the opposite direction to the bishop.
Specific types of Turton doubling are the Loyd-Turton, in which the first piece moved is of greater value than the second; and the Brunner-Turton, in which the two pieces are of equal value. Cases such as Turton's original, in which the piece moved first is of lesser value than the second, have no special name.
Turton doubling can be contrasted with another form of doubling, Zepler doubling
.
Chess
Chess is a two-player board game played on a chessboard, a square-checkered board with 64 squares arranged in an eight-by-eight grid. It is one of the world's most popular games, played by millions of people worldwide at home, in clubs, online, by correspondence, and in tournaments.Each player...
in which a piece moves along a line (rank, file or diagonal), then a similarly-moving piece moves onto the same line in front of it, then this second piece moves again along this line, in the opposite direction to that of the first. Use of the term is effectively limited to the field of chess problem
Chess problem
A chess problem, also called a chess composition, is a puzzle set by somebody using chess pieces on a chess board, that presents the solver with a particular task to be achieved. For instance, a position might be given with the instruction that White is to move first, and checkmate Black in two...
s.
The idea can be understood in reference to the problem to the right, the first to demonstrate the manoeuvre, composed by its eponym, Henry Turton. A mate in three, the solution is 1.Bh8 (threatening 2.Qa3#) 1...b4 2.Qg7 Ra8 (defending against 3.Qa7#) 3.Qxb2#. The bishop moves along the diagonal a1-h8, then the queen moves onto that same diagonal, then the queen moves again in the opposite direction to the bishop.
Specific types of Turton doubling are the Loyd-Turton, in which the first piece moved is of greater value than the second; and the Brunner-Turton, in which the two pieces are of equal value. Cases such as Turton's original, in which the piece moved first is of lesser value than the second, have no special name.
Turton doubling can be contrasted with another form of doubling, Zepler doubling
Zepler doubling
Zepler doubling is a manoeuvre in chess in which a piece moves along a certain line , then another friendly piece moves onto that same line, then the first piece moves again in the same direction as before...
.