Fore and back

	Fore and back
	<a href="/wiki/File:Foreandback.png" class="image" title="Fore and back image"><img alt="Fore and back image" src="/w/images/a/ae/Foreandback.png" decoding="async" width="146" height="146" /></a>
	<a href="/wiki/File:Foreandback.png" class="image" title="Fore and back image"><img alt="Fore and back image" src="/w/images/a/ae/Foreandback.png" decoding="async" width="146" height="146" /></a>
	View animated image
	View static image
Pattern type	Oscillator
Number of cells	24
Period	2
Mod	Unknown
Heat	4
Volatility	Unknown
Strict volatility	Unknown
Discovered by	Achim Flammenkamp
Year of discovery	1994
Pattern files
Plaintext	foreandback.cells
RLE	foreandback.rle

Fore and back (or complementary blinker) is a period 2 oscillator that was found by Achim Flammenkamp in July 1994. It is about the 38th most common naturally-occurring oscillator, being less common than boat on spark coil and griddle and block, about as common as 21P2, and more common than trans-block and long hook eating tub and trans-beacon down and long hook.^[1]

References

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