Misplaced Pages

Turton doubling

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
This article uses algebraic notation to describe chess moves. Henry Turton (version)
Illustrated London News, 1856
abcdefgh
8c8 black rookh7 black pawnb6 white pawnb5 black pawnc5 black pawnc4 black pawnc3 white bishopg3 white queenh3 white kingb2 black pawnd2 white knighta1 black king8
77
66
55
44
33
22
11
abcdefgh
Mate in three.

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 problems, although it happens in real games as well (especially when White moves the bishop on d3 back to let the queen in front to threaten Qh7#, and analogous for Black).

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.

References


Stub icon

This chess-related article is a stub. You can help Misplaced Pages by expanding it.

Categories: