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Movement themes

 
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mrmip
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Joined: 05 Nov 2005
Posts: 230
Location: Finland

PostPosted: Fri Oct 10, 2014 5:28 am    Post subject: Movement themes Reply with quote

Movement themes are slightly different from repertoire themes. While repertoire displays all possible different moves of a piece, a movement theme relates to a specific way a piece actually moves during the solution. I have chosen four themes here.

(1) Switchback is a simple theme, where a unit returns to the initial square through the same route it departed.

(2) Rundlauf or Round-trip is a similar theme, but the piece returns via a different route. It performs a smaller or larger trip around. This theme is sometimes called Merry-go-round. For obvious reasons this is hard to present in a two-mover Wink.

(3) Staircase is a theme, where a piece (normally Q or R) moves like stepping up (or down) a diagonal. You will easily recognize that, when you see it.

(4) Mousetrap (or Guillotine) is a theme, where opponent's piece is lured away along a line or diagonal and then shut off preventing its return via same route with harmful consequences.

These themes are introduced in puzzles: #1602 - 1607

[Special note: One of the puzzles is a helpmate. In a helpmate black begins and helps white to achieve a mate in given number of white moves.]
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