|View static image|
|Number of cells||67|
|Bounding box||13 × 19|
|Discovered by||Eugene Langvagen|
|Year of discovery||2004|
Almost knightship is a partial spaceship discovered by Eugene Langvagen on March 23, 2004 using afind. It would have been an elementary knightship if two cells at the back end were not incorrect after the 6th generation, which provided evidence that small elementary knightships may exist within a considerably small bounding box. The original search also found a slightly longer incomplete result with more incorrect cells.
Several more small almost knightships were found by Tomas Rokicki in February 2018, using a SAT solver, of velocities (2,1)c/6 and (2,1)c/7. Further searching by Adam P. Goucher based on these partials led to the finding of a true elementary knightship, Sir Robin. Similarly, another almost knightship by Dylan Chen was completed to give Sprayer. However, as of July 2023, none of the knightships uses the front end of the original almost knightship.
A further (2,1)c/7 almost knightship where 4 extra cells are produced in the formation of a spark was found by Goucher on December 12, 2020. As of November 2023, though, no period-7 knightships have been found in regular Life.
|(2,1)c/7 almost knightship that emits a deadly spark.|
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- Eugene Langvagen (March 23, 2003). "Miscellaneous". PLife Home Page. Retrieved on May 28, 2022.
- Tomas Rokicki (February 14, 2018). Four new almost-knightships CGOL (discussion thread) at the ConwayLife.com forums
- praosylen (January 22, 2021). Re: Four new almost-knightships CGOL (discussion thread) at the ConwayLife.com forums
- Adam P. Goucher (December 12, 2020). Message in #cgol on the Conwaylife Lounge Discord server