Jormungant's G-to-H

Jormungant's G-to-H
x = 27, y = 58, rule = B3/S23 15bo$16bo$14b3o8$18bo$o11b2o2b2o$3o9b2o3b2o$2bo$2bo2$19b2obo2bo$20bob 4o$18bobo$18b2o2b2o$23bo$22bo$22b2o10$16bo$15bobo$15bobo$13b3ob2o$12bo $13b3ob2o$15bob2o7$18bo6bo$o11b2o2b2o6b2o$3o9b2o3b2o5bobo$2bo$2bo2$19b 2obo$20bob3o$18bobo4bo$18b2o2b2obo$23bob2o$21bo$21b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBNAIL THUMBSIZE 3 WIDTH 600 HEIGHT 1000 GPS 20 LOOP 58 ZOOM 16 PAUSE 2 T 57 PAUSE 2 AUTOSTART ]]
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Pattern type	Conduit
Conduit type	Stable
Input	Glider
Output	Herschel
Number of cells	39, 60
Bounding box	27 × 57
Step	Unknown
Recovery time (ignoring FNG if any)	47 ticks
Minimum overclock period (ignoring FNG if any)	Unknown
Discovered by	Louis-François Handfield
Year of discovery	2018
Rules Outer-totalistic rules B3/S23 – B38/S238 # of rules 22 = 4 Isotropic rules B3/S23 – B34c6c8/S234c5e6ei8
Pattern files Plaintext jormungantsgtoh.cells RLE jormungantsgtoh.rle

Jormungant's G-to-H is either of two closely related stable 2 glider-to-Herschel converters discovered by Louis-François Handfield (pseudonym: Jormungant) in 2018. It consists of a block, a BTS, and an eater 2 (for the bottom variant) which convert two synchronized gliders into a Herschel with repeat time 47. In the infobox pattern, a ghost Herschel marks the output location.

Unlike most glider-to-Herschel converters, this converter's initial glider-block collision converts the block into a honey farm predecessor, instead of a pi-heptomino. The second glider, along with the BTS catalyst, convert the pre–honey farm into a B-heptomino, which forms a block at the original location and produces a Herschel output. There are two possible positions for this second glider; one of these requires the presence of an additional eater 2, as well as replacing the BTS with an equivalent larger catalyst with better clearance.

It is the basis of various low-period guns, for example p13-assisted period-52 glider gun. Without this, it would take 3 gliders to create a Herschel by using the glider synthesis of a B-heptomino, plus one extra glider to delete the B-heptomino's block. In cases such as the original period-52 glider gun, this would not be sufficient to create an over-unity reaction due to the difficulty of extracting 4 gliders from an output Herschel at such a low period. The discovery of this fast 2G-to-H was thus a key innovation allowing these low-period guns to be constructed.