CC semi-Snark

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.

CC semi-Snark
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Pattern type Stable reflector
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

It functions as a very compact period doubler in some signal circuitry, for example the original 2014 spiral growth pattern. 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.

The CC semi-Snark tied with the linear propagator for third place in the Pattern of the Year 2013 competition in a belated vote held in 2018 on the ConwayLife.com forums, behind the loafer and the Snark.[2]

Also see
gollark: Also, for doomsday device antitampering CC can be quite helpful. Especially Plethora and its entity sensor - you can detect unauthorized players at range.
gollark: I was thinking that putting the reactor on Ten Metre Island might be a bad idea, since power cables which can transfer the 2kRF/t output of it are slightly expensive (invar) and we'd need to run itemducts for fuel over too.
gollark: No, Nuclearcraft stuff won't explode, only melt into corium.
gollark: The plant is, though, I must say, a bit far from anywhere where it might be used or where fuel could be produced.
gollark: I can fiddle with my program for managing P2P tunnels for this.

References
  1. Sergey Petrov (Guam) (July 1, 2013). "Re: Thread For Your Accidental Discoveries". Retrieved on October 14, 2015.
  2. 77topaz (March 29, 2018). Re: Belated Pattern of the Year 2013 competition: Voting (discussion thread) at the ConwayLife.com forums
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