7-in-a-row Cordership

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7-in-a-row Cordership
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Pattern type Spaceship
Family Cordership
Number of cells 289
Bounding box 114×113
Direction Diagonal
Period 96
Mod 48
Speed c/12
Heat 258.3
Discovered by Dean Hickerson
Year of discovery 1998

The 7-in-a-row Cordership is a diagonal spaceship that was discovered by Dean Hickerson on July 23, 1998.[1] It is one of the smallest known Corderships, and one of the Corderships with a known glider synthesis. It shares many properties with the 6-in-a-row Cordership.

Synthesis and destruction

A 48-glider synthesis for the 7-in-a-row Cordership has been known since June 2003, consisting of a 21-glider salvo meeting a 27-glider salvo. At that time a gun was constructed that fires 7-in-a-row Corderships; it is known as the V gun due to its shape.

Due to Luka Okanishi's discovery of a three-glider switch engine synthesis in 2017, the 7-in-a-row Cordership can now be constructed with only 25 gliders.

This Cordership can also be eaten, as shown by the pattern below that was created on July 4, 2003, based on a glider-extraction reaction found by Karel Suhajda which might be considered a Cordership Heisenburp, since the Cordership passes by the tub catalyst without being permanently affected. The Cordership eater consists of seven eater 2s and two tubs to do the majority of the eating, along with some Herschel tracks that produce gliders to clean up some blocks that are left behind.

7-in-a-row Cordership eater
Download RLE: click here

A much more compact eater, or an equally compact Cordership-to-glider converter, can now be constructed thanks to the subsequent discovery of the Snark reflector and the syringe.


See also

References

  1. Jason Summers' jslife pattern collection.