Above:Variant "Rotocross"
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A puzzle with two or three circles and a plunger which can exchange pieces between the circles.
This puzzle is one of Douglas Engel's patented creations made in low quantities. Mr. Engel presents a whole series of puzzle working with the same principle but with many differences, including the mechanics and colours.
In general every variant has two or three circles of which a portion (lessw than one halve) was cut away. Instead of the cut away part one circular segment is placed in a plunger. This plunger can be moved with the pieces between the circles which allows the exchange of pieces. Only one circle can be turned at a given time.
On his website Mr. Engel presents 16 variants in 8 different sets which all share the same shape. Mr. Engel created not all variants of these puzzles each with some subvariants and different colour patterns. In some variants the circles overlap in others they are split completely.
It could be argued that the puzzles are different enough to be presented in different spaces but Mr. Engel presented them together under the shared named "Slide Rule Duel".
The variant Rocketeer was an exchange puzzle during IPP29 in 2009 in San Francisco. The first year of production is so far unknown. The year given here is the earliest copyright given on Douglas' website. The puzzles can be obtained directly from Douglas Engel who makes them with laser cutting.
The variants are:
1. Rotoclipse, Rotocross, Rocketeer. Two split circles with turns in step of 90?.
2. Triometer. Three variants with two overlapping circles with turns in step of 120?.
3. Quadrometer. Three variants with two overlapping circles with turns in step of 90?.
4. Hexometer. Three variants with two overlapping circles with turns in step of 60?.
5. Binary Bisect. Two variants with three overlapping circles with turns in step of 180?.
6. Pie series. Two variants with two split circles with turns in step of 45?.
7. Pentaplenty. One variant with two split circles with turns in step of 72?.
8. Heptalive. One variant with two split circles with turns in step of 360/7?.
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Slide Rule Duel
