Interchange is a common constellation of six blinkers .
There are two different interchanges; the more common one is displayed to the right. The less common variant has five cells between the left and right halves instead of four.
Two gliders reflected along an axis of symmetry with an even number of rows between them form an interchange. With an odd number of rows, it becomes a bi-block instead.
x = 7, y = 4, rule = B3/S23
3bo$b2ob2o$6bo$o!
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Unlike most common sequences which require only five or six cells the minimum number of cells needed to form an interchange is seven(click above to open LifeViewer ) RLE : here Plaintext : here
Hasslers
Interchanges can be hassled, although not that many are known because the interchange doesn't expand as much as several more common sequences like the R-pentomino or Pi-heptomino .
x = 38, y = 28, rule = B3/S23
25b2o$22b2o2bo$22bo3bobo$23b3obobo$27bobo$3bo17b4ob2obob2o$2bobo15bo6b
obob2o$2bobo10bo3bobobo5bo$2o2b2o8bobobobo3bo3b2o$bobo6b2o2bobobo6bo$o
2b3o4bobobobob2o11b2o$obo3bo5bobobo2bo5b3o3b2o$bob3obo4bo2bo2bo6b3o4bo
$3bo3bo2bob2obo3bo10b5obo$3bo3bo2bob2obo3bo11b3o3bo$bob3obo4bo2bo2bo6b
3o8bo$obo3bo5bobobo2bo5b3o$o2b3o4bobobobob2o$bobo6b2o2bobobo6bo$2o2b2o
8bobobobo3bo3b2o$2bobo10bo3bobobo5bo$2bobo15bo6bobob2o$3bo17b4ob2obob
2o$27bobo$23b3obobo$22bo3bobo$22b2o2bo$25b2o!
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p9, found by David Raucci on January 24, 2022 (click above to open LifeViewer ) Catagolue : here
x = 22, y = 24, rule = B3/S23
3b2o12b2o$3b2o12b2o2$b6o8b6o$o6bo6bo6bo$2o3b2o8b2o3b2o$4bo12bo2$3b3o
10b3o$3b3o10b3o$2ob3o2bo4bo2b3ob2o$o2b3o2bo4bo2b3o2bo$bob3o2bo4bo2b3ob
o$2ob3o4b2o4b3ob2o$3b3o10b3o$3b3o10b3o2$4bo12bo$2o3b2o8b2o3b2o$o6bo6bo
6bo$b6o8b6o2$3b2o12b2o$3b2o12b2o!
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p16 pre-interchange hassler, found by Carson Cheng on October 8, 2022 (click above to open LifeViewer ) Catagolue : here
x = 28, y = 27, rule = B3/S23
12bob2o4b2obo$12b2o2bo2bo2b2o$10b2o3bo4bo3b2o$bo2bo4bo3b2ob4ob2o3bo$4b
o5b3obobo2bobob3o$o4bo6bobob4obobo$2o2bobo7bo2b2o2bo$5bob2o6b2o2b2o3$
5bo2bo$5b2o6b2o$12b4o$11bo4bo$12b4o$13b2o6b2o$19bo2bo3$7b2o2b2o6b2obo$
6bo2b2o2bo7bobo2b2o$4bobob4obobo6bo4bo$2b3obobo2bobob3o5bo$bo3b2ob4ob
2o3bo4bo2bo$2b2o3bo4bo3b2o$4b2o2bo2bo2b2o$4bob2o4b2obo!
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p18, found by David Raucci on October 3, 2021 and reduced by Matthias Merzenich the next day(click above to open LifeViewer ) Catagolue : here
x = 43, y = 41, rule = B3/S23
5bo32bo$5bo32bo$5bo32bo$7b2o3bo18bo3b2o$b3o3b2o3b2o16b2o3b2o3b3o$14bo
14bo$13b2o14b2o3$2b2o31b2o$3bo32bo$3o30b3o$o32bo$5bo$6b2o$4b2o6b2o$6bo
3bo4bo$10bo4bo$10bo4bo10b2o$6b2o18bo$5bobo16bobo$5bo18b2o$4b2o10bo4bo$
16bo4bo$16bo4bo3bo$18b2o6b2o$24b2o$26bo$10bo22bo$8b3o22b3o$7bo28bo$7b
2o26b2o3$13b2o14b2o$14bo14bo$b3o3b2o3b2o16b2o3b2o3b3o$7b2o3bo18bo3b2o$
5bo32bo$5bo32bo$5bo32bo!
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p38, found by cvojan on April 20, 2022 based on a partial by David Raucci (click above to open LifeViewer ) Catagolue : here
x = 30, y = 24, rule = B3/S23
7bo14bo$2o4bobo12bobo4b2o$obo4bo14bo4bobo$2bo24bo$2b3o20b3o$5bo18bo$2b
3o20b3o$2bo24bo$obo7bo8bo7bobo$2o7bobo6bobo7b2o$8b2ob2o4b2ob2o$8bo3bo
4bo3bo$8bo3bo4bo3bo$8b2ob2o4b2ob2o$2o7bobo6bobo7b2o$obo7bo8bo7bobo$2b
o24bo$2b3o20b3o$5bo18bo$2b3o20b3o$2bo24bo$obo4bo14bo4bobo$2o4bobo12bo
bo4b2o$7bo14bo!
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p40 interchange which is hassled in a similar fashion to the p84 below, but with stable supports. Incorrectly named "p40 moose honey farm hassler" on Catagolue. Found by Mitchell Riley.(click above to open LifeViewer ) Catagolue : here
x = 32, y = 33, rule = B3/S23
19b2o$6o8b2o2b2obo5b2o$4o10b2o3bobo5b2o$3bobo15bo$5b2o16bo$2bo2bob2o$b
o3bob2o14bo$2obo3bo13bo$2obo2bo7b2o3bobo5b2o$2b2o10b2o2b2obo5b2o$3bobo
13b2o$5b4o$3b6o3$13b2o2b2o$13b2o2b2o$13b2o2b2o3$23b6o$23b4o$11b2o13bob
o$3b2o5bob2o2b2o10b2o$3b2o5bobo3b2o7bo2bob2o$10bo13bo3bob2o$8bo14b2obo
3bo$23b2obo2bo$8bo16b2o$10bo15bobo$3b2o5bobo3b2o10b4o$3b2o5bob2o2b2o8b
6o$11b2o!
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p42 that alternates between an interchange and a pentadecathlon , found by Period1GliderGun on May 2, 2024 (click above to open LifeViewer ) Catagolue : here
x = 34, y = 17, rule = B3/S23
30bo$28b3o$7b2o18bo$7b2o18b2o$bo30bo$o2bo26bo2bo$o2bo12b2o12bo2bo$2bo
12b4o7b2o3bo$6b2o6bo4bo6b2o$2bo3b2o7b4o12bo$o2bo12b2o12bo2bo$o2bo26bo
2bo$bo30bo$5b2o18b2o$6bo18b2o$3b3o$3bo!
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#C [[ GPS 23 THUMBSIZE 2 ]]
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p46, found by Carson Cheng on September 22, 2023 (click above to open LifeViewer ) Catagolue : here
x = 46, y = 50, rule = B3/S23
12bo$12b3o$15bo$14bobobobo$13bob3o3bo$13bobobo2bo$14bo2b2o$15bo2bo$b2o
5b2o26b2o5b2o$2bo5bo6bo3bo12bo4bo5bo$30b3o$16b3o10bo$3b2ob2o21b2o7b2ob
2o2$2bobobobo28bobobobo$bo7bo26bo7bo$o2bo3bo2bo24bo2bo3bo2bo$3o5b3o24b
3o5b3o4$b2o5b2o26b2o5b2o$b2o5b2o7b3o6b3o7b2o5b2o$17b3o6b3o3$17b3o6b3o$
b2o5b2o7b3o6b3o7b2o5b2o$b2o5b2o26b2o5b2o4$3o5b3o24b3o5b3o$o2bo3bo2bo
24bo2bo3bo2bo$bo7bo26bo7bo$2bobobobo28bobobobo2$3b2ob2o21b2o7b2ob2o$
16b3o10bo$30b3o$2bo5bo6bo3bo12bo4bo5bo$b2o5b2o26b2o5b2o$15bo2bo$14bo2b
2o$13bobobo2bo$13bob3o3bo$14bobobobo$15bo$12b3o$12bo!
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p84, found by David Raucci on July 22, 2021 (click above to open LifeViewer ) Catagolue : here
See also
External links