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x = 24, y = 18, rule = B34w5y/S234w5a8 2$11bo$10bobo$9bo3bo$9b5o3$4b3ob3ob3ob3o$4bobobobobobobobo$6bobo5bobo $6bobo5bobo$5b2ob2o3b2ob2o!You specified too many words to search forThe following words in your search query were ignored because they are too common words: e. You must specify at least one word to search for. Each word must consist of at least 2 characters and must not contain more than 20 characters excluding wildcards.x = 19, y = 7, rule = B34w5y/S234w5a8 2$6bo7bo$5bobo5bobo$4bo3bo3bo
 
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Line 4: Line 4:
|c                = 15
|c                = 15
|bx              = 10
|bx              = 10
|by              = 5
|by              = 6
|fc              = 27.2
|fc              = 27.2
|p                = 8
|p                = 8
Line 11: Line 11:
|v                = 0.89
|v                = 0.89
|sv              = 0.89
|sv              = 0.89
|symmetry        = n.k
|discoverer      = Robert Wainwright
|discoverer      = Robert Wainwright
|rulemin          = B3/S23
|rulemin          = B3/S23
|rulemax          = B378/S23678
|rulemax          = B378/S23678
|rulespecial      = [[Conway's Game of Life|Conway Life]]
|isorulemin      = B3-cey/S23anq
|isorulemin      = B3-cey/S23anq
|isorulemax      = B2n34acety5-y6-n78/S234-anry5-ci678
|isorulemax      = B2n34acety5-y6-n78/S234-anry5-ci678
Line 26: Line 26:
|viewerconfig    = #C [[ GPS 4 THUMBSIZE 2 ]]
|viewerconfig    = #C [[ GPS 4 THUMBSIZE 2 ]]
}}
}}
'''Blocker''' is a {{period|8}} [[oscillator]] found by [[Robert Wainwright]].<ref>{{CiteHickersonOscillators|accessdate=March 14, 2020}}</ref> It is a useful dot [[sparker]] consisting of two [[block]]s [[Hassler|hassling]] an unnamed object which is a dying spark. It reappears halfway through its cycle rotated 180 degrees.  
'''Blocker''' is a {{period|8}} [[oscillator]] found by [[Robert Wainwright]].<ref>{{CiteHickersonOscillators|accessdate=March 14, 2020}}</ref> It consists of two [[block]]s [[hassle|hassling]] an unnamed object which is a dying spark. It reappears halfway through its cycle rotated 180°.
 
Blockers can also be infinitely connected by "sharing" blocks, as long as adjacent reactions are no more than one phase apart. They can also be connected with [[Coe's p8]], which uses blocks as [[catalyst]]s in a similar manner.


Blockers can also be infinitely connected by "sharing" blocks, as long as adjacent reactions are no more than one phase apart. They can also be connected with [[Coe's p8]], which uses blocks as hasslers in a similar manner.


{{EmbedViewer
{{EmbedViewer
|pname        = blockersharingblocks
|position    = center
|position    = center
|viewerconfig = #C [[ AUTOSTART THEME 6 GRID GPS 8 GRIDMAJOR 0 ZOOM 16 HEIGHT 480 THUMBLAUNCH THUMBSIZE 2 LOOP 8 ]]
|viewerconfig = #C [[ AUTOSTART GPS 4 ZOOM 14 HEIGHT 400 THUMBLAUNCH THUMBSIZE 2 LOOP 8 ]]
|pname        = blockersharingblocks
|caption      = Blockers sharing blocks with a Coe's p8
|caption      = Blockers sharing blocks<br/>
|style        = width:360px;
}}
}}


==[[List of common oscillators|Commonness]]==
 
 
== Applications ==
Blocker is a versatile [[corner dot]] [[sparker]] employed in many situations, for example [[two pre-L hasslers]], [[p40 B-heptomino shuttle|p40]] and [[p56 B-heptomino shuttle]], and [[two blockers hassling R-pentomino]].
 
As a [[filter]], a blocker can double the period of a [[glider]] [[stream]] that is a multiple of 4 but not 8 by deleting every second glider.
 
== Commonness ==
{{main|List of common oscillators}}
Blocker is about the sixteenth most [[common]] naturally-occurring oscillator in [[Achim Flammenkamp's census]], being less common than [[mazing]] but more common than [[jam]].<ref>{{citeAchim|accessdate=January 15, 2009}}</ref> On [[Catagolue]], it is the second most common period 8 oscillator, being less common than the [[figure eight]] but more common than [[Coe's p8]].<ref>{{citeCatagolueStats|October 27, 2018}}</ref>
Blocker is about the sixteenth most [[common]] naturally-occurring oscillator in [[Achim Flammenkamp's census]], being less common than [[mazing]] but more common than [[jam]].<ref>{{citeAchim|accessdate=January 15, 2009}}</ref> On [[Catagolue]], it is the second most common period 8 oscillator, being less common than the [[figure eight]] but more common than [[Coe's p8]].<ref>{{citeCatagolueStats|October 27, 2018}}</ref>


The first natural blocker [[stator]] variant, blocker on [[cap]], occurred in September {{year|2015}}.<ref name="post22442" />
The first natural blocker [[stator]] variant, blocker on [[cap]], occurred in September {{year|2015}}.<ref name="post22442" />


==See also==
== Glider synthesis ==
*[[Coe's p8]]
In January 2015, [[Bob Shemyakin]] found a two-stage {{gliders|5|text=5-glider}} [[synthesis]] of a blocker.<ref name="post15823" /> Another two-directional 5-glider recipe was used in a larger synthesis in 2022.<ref name="post141949" />
*[[Filter]]


==References==
== See also ==
* [[Period-8 sparkers]]
* [[Achim's p8]]
 
== References ==
<references>
<references>
<ref name="post22442">{{LinkForumThread
<ref name="post22442">{{LinkForumThread
Line 54: Line 67:
|author = Billabob
|author = Billabob
|date  = September 9, 2015
|date  = September 9, 2015
}}</ref>
<ref name="post15823">{{LinkForumThread
|format = ref
|title  = Re: 4 glider syntheses
|p      = 15823
|author = Bob Shemyakin
|date  = January 7, 2015
}}</ref>
<ref name="post141949">{{LinkForumThread
|format = ref
|title  = Re: Synthesising Oscillators
|p      = 141949
|author = Ian07
|date  = February 21, 2022
}}</ref>
}}</ref>
</references>
</references>


==External links==
== External links ==
{{LinkLexicon|filename=lex_b.htm#blocker}}
* {{LinkLexicon|filename=lex_b.htm#blocker}}
{{LinkCatagolue|xp8_g3jgz1ut}}
* {{LinkCatagolue|xp8_g3jgz1ut}}
{{LinkPentadecathlonObject|15P8.1}}
* {{LinkNiemiec|p8.htm#p8-15|patternname=The 1 fifteen-bit period 8 oscillator|rle=15/15br.rle}}
 
* {{LinkPentadecathlonObject|15P8.1}}
{{Symmetry|osc=turn180}}
{{Sparker|p=8|type=dot|strength=strong}}
{{Sparker|p=8|type=dot|strength=strong}}
__NOTOC__
__NOTOC__

Latest revision as of 14:05, 22 January 2026

Blocker
6bobob$5bo4b$2o2bo4bo$2obo2bob2o$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 4 THUMBSIZE 2 ]]
View animated image
View static image
Pattern type Oscillator
Number of cells 15
Bounding box 10 × 6
Frequency class 27.2
Period 8 (mod: 4)
Heat 9
Volatility 0.89 | 0.89
Kinetic symmetry n.k
Discovered by Robert Wainwright
Year of discovery Unknown

Blocker is a period-8 oscillator found by Robert Wainwright.[1] It consists of two blocks hassling an unnamed object which is a dying spark. It reappears halfway through its cycle rotated 180°.

Blockers can also be infinitely connected by "sharing" blocks, as long as adjacent reactions are no more than one phase apart. They can also be connected with Coe's p8, which uses blocks as catalysts in a similar manner.


x = 38, y = 12, rule = B3/S23 16bobo5bobo$15bo7bo$7bob3o2bo4bo2bo4bo$7b5obo2bob2obo2bob2o$7b2o5b2o6b 2o$4bo2bo25bob3o$2o3b2o26b5o$2o3bo18bobo6b2o$15bo7bo6bo2bo$10b3ob2o2b 2o2bo4bo3b2o$10b4o4b2obo2bob2o3bo$14b2o6b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 4 ZOOM 14 HEIGHT 400 THUMBLAUNCH THUMBSIZE 2 LOOP 8 ]]
Blockers sharing blocks with a Coe's p8
(click above to open LifeViewer)
RLE: here Plaintext: here


Applications

Blocker is a versatile corner dot sparker employed in many situations, for example two pre-L hasslers, p40 and p56 B-heptomino shuttle, and two blockers hassling R-pentomino.

As a filter, a blocker can double the period of a glider stream that is a multiple of 4 but not 8 by deleting every second glider.

Commonness

Main article: List of common oscillators

Blocker is about the sixteenth most common naturally-occurring oscillator in Achim Flammenkamp's census, being less common than mazing but more common than jam.[2] On Catagolue, it is the second most common period 8 oscillator, being less common than the figure eight but more common than Coe's p8.[3]

The first natural blocker stator variant, blocker on cap, occurred in September 2015.[4]

Glider synthesis

In January 2015, Bob Shemyakin found a two-stage 5-glider synthesis of a blocker.[5] Another two-directional 5-glider recipe was used in a larger synthesis in 2022.[6]

See also

References

  1. ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  3. ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
  4. ↑ Billabob (September 9, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  5. ↑ Bob Shemyakin (January 7, 2015). Re: 4 glider syntheses (discussion thread) at the ConwayLife.com forums
  6. ↑ Ian07 (February 21, 2022). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums


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