Griddle and block

	Griddle and block
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	<a href="/wiki/File:Griddleandblock.png" class="image" title="Griddle and block image"><img alt="Griddle and block image" src="/w/images/b/b4/Griddleandblock.png" width="129" height="145" /></a>
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Pattern type	Oscillator
Family	Griddle
Number of cells	15
Bounding box	6×7
Frequency class	30.0
Period	2
Mod	1
Heat	6
Volatility	0.33
Strict volatility	0.33
Rotor type	Flutter
Discovered by	Robert Wainwright
Year of discovery	1972
Rules
Outer-totalistic rules	B3/S23 – B3678/S02345678
Important rules	Conway Life
# of rules	29 = 512
Glider synthesis
Fewest gliders	6
RLE	griddleandblock_synth.rle
Pattern files
Life 1.05	griddleandblock_105.lif
Life 1.06	griddleandblock_106.lif
Plaintext	griddleandblock.cells
RLE	griddleandblock.rle
Identifiers
apgcode	xp2_c8b8aczw33
Pentadecathlon ID	15P2.28

Griddle and block (or singular flip flop) is a period 2 oscillator that was discovered by Robert Wainwright in July 1972.

Commonness

Griddle and block is about the thirty-sixth most common naturally-occurring oscillator in Achim Flammenkamp's census, being slightly less common than the cis-beacon down and long hook, approximately as common as the boat on spark coil, and more common than fore and back and 21P2.^[1]

In October 2014, Ivan Fomichev found a 6-glider synthesis for this pattern based on a soup from Adam P. Goucher's apgsearch script.^[2]

↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
↑ "Soup search results". Retrieved on November 9, 2014.