7-in-a-row Cordership

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 | 8c/96
Heat	258.3
Discovered by	Dean Hickerson
Year of discovery	1998
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3/S23 only
Glider synthesis Fewest gliders 25† Catagolue-generated RLE synthesis Uploaded synthesis RLE 7inarowcordership_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext 7inarowcordership.cells RLE 7inarowcordership.rle
Identifiers apgcode xq96_yzyy4e1msgzyzyzw167y8cczyzyzciczyzyzy5gyb33zyzyl8s0soyd343y3oggy8oozyzy7sy4gy461yk49dq052zyzy826ik465c12yu321y186czyso8ozyshh9ogy5cgmgogkgb5zyr27d0877y78kgeyegcozylsy4gyfoozym26ik465c12y433yc11259p0cgzyzy9ooya11zyvgoggzy9g0gy3g0ogy04a1951dc72zgo4ogy31303r4y1321z0106ruzw8gy28kk8zw2jjgyo8okz0324447y72552zy2ggzy211zyacc

The 7-in-a-row Cordership is a diagonal spaceship that was discovered by Dean Hickerson on July 23, 1998. 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

• 5-engine Cordership
• 6-engine Cordership
• 7-engine Cordership

External links

• 7-in-a-row Cordership at Adam P. Goucher's Catagolue (extended)