CC semi-Snark
CC semi-Snark | |||||||||
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Pattern type | Stable reflector | ||||||||
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Number of cells | 31 | ||||||||
Bounding box | 19 × 19 | ||||||||
Angle | 90° | ||||||||
Repeat time | 51 | ||||||||
Period multiplier | 2× | ||||||||
Colour | Colour-changing | ||||||||
Discovered by | Sergey Petrov | ||||||||
Year of discovery | 2013 | ||||||||
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The colour-changing (CC) semi-Snark is a small, Spartan 90-degree colour-changing glider reflector requiring two input gliders on the same lane for each output glider. It was discovered by Sergey Petrov on 1 July 2013,[1] using a custom-written search utility called CollisionsSearch[2].
It functions as a very compact period doubler in some signal circuitry, for example the original 2014 spiral growth pattern and recently-created Engineered diehards. The semi-Snark can period-double a regular glider stream of period 51 or more, or an intermittent stream with two gliders every 67 ticks or more, since the block reset glider can be sent just 16 ticks before its partner.
The CC semi-Snark's discovery revolutionized self-constructing circuitry. Its small size and Spartan catalysts allowed Dave Greene in November 2013 to complete the construction of the linear propagator, which is sometimes counted as the first true replicator in Conway's Game of Life. Its use in self-constructing patterns has dropped off since then, because single-channel toolkits no longer need to retrieve multiple glider signals from a single stream. However, the CC semi-Snark is still one of the key components in stable signal converter technology, notably the doubled-signal toolkit for efficiently producing multiple synchronized gliders from a single input.
CC semi-Snark ranked third place in the Pattern of the Year 2013 competition in a belated vote held on the ConwayLife.com forums, tied with the linear propagator, and behind the loafer and the Snark.[3]
The boat can be replaced with a tub, though this only reduces its population and tubs take more gliders to synthesise.
See also
References
- ↑ Sergey Petrov (July 1, 2013). Re: Thread For Your Accidental Discoveries (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (June 6, 2016). Guam's CollisionsSearch utility (discussion thread) at the ConwayLife.com forums
- ↑ 77topaz (March 29, 2018). Re: Belated Pattern of the Year 2013 competition: Voting (discussion thread) at the ConwayLife.com forums
External links
- CC semi-Snark at the Life Lexicon
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