Backrake 2
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| Backrake 2 | |||||||||
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| Pattern type | Rake Puffer | ||||||||
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| Number of cells | 65 | ||||||||
| Bounding box | 19 × 26 | ||||||||
| Direction | Orthogonal | ||||||||
| Period | 12 | ||||||||
| Speed | c/2 | ||||||||
| Discovered by | David Buckingham | ||||||||
| Year of discovery | Unknown | ||||||||
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Backrake 2 is a period-12 backrake that was created by David Buckingham. It works by having a front puffer made up of two lightweight spaceships, a middleweight spaceship, and a B-heptomino (much like puffer 2) send debris back to another lightweight and middleweight spaceship, which turn the debris into a backward-moving glider.
Three copies of this backrake feature in total aperiodic.
Reduction
On April 28, 2022, wwei23 discovered a 39-cell period-12 backrake that works as a reduced version of Backrake 2 using the apgsearch custom symmetry WSS_test, that had also found 35P12H6V0.[1] Dave Greene found a 13-glider synthesis on November 1, 2022.[2]
| 39-cell period-12 reduced version of backrake 2 (click above to open LifeViewer) RLE: here Plaintext: here |
References
- ↑ wwei23 (April 28, 2022). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (November 1, 2022). Re: Thread for Basic Questions (discussion thread) at the ConwayLife.com forums