## Brute-forcing an eater 2 seed

For discussion of specific patterns or specific families of patterns, both newly-discovered and well-known.

### Brute-forcing an eater 2 seed

I'm currently running a gencols search in a hope to find a small p2 seed for any eater 2 variant.

I will post interesting byproducts of this search here.

22.249310
`x = 17, y = 11, rule = B3/S23bo13b2o\$obo11bobo\$obo11bo\$bo11b2o5\$10b3o\$10bo\$11bo!`

A pseudo still life consisting of a bi-block and two boats
`x = 10, y = 21, rule = B3/S233b2o\$3bobo\$5bo\$5b2o7\$2o\$obo\$bo3\$8b2o\$8b2o2\$2b2o\$bobo\$3bo!`

18.206
`x = 14, y = 10, rule = B3/S239b2o\$b2o6b2o\$o\$3bo\$b2o2\$5b3o\$7bo4bo\$6bo4bobo\$12b2o!`

19.34492
`x = 12, y = 12, rule = B3/S234bo\$3bo\$3b3o4bo\$9bobo\$8bobo\$9bo2\$2o\$2o4b2o\$7bo\$5bo\$5b2o!`
Ivan Fomichev

codeholic
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### Re: Brute-forcing an eater 2 seed

16.36
`x = 17, y = 14, rule = B3/S233b2o\$3b2o3\$14b2o\$14bobo\$3o12b2o\$2bo\$bo4\$7b2o\$7b2o!`
Ivan Fomichev

codeholic
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### Re: Brute-forcing an eater 2 seed

Figure eight
`x = 13, y = 9, rule = B3/S23b3o\$3o\$10b2o\$10bobo\$11bo2\$7b3o\$7bobo\$7bobo!`
Ivan Fomichev

codeholic
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### Re: Brute-forcing an eater 2 seed

16.117
`x = 6, y = 18, rule = B3/S233bo\$3bo\$3bo3\$bo\$obo\$bo2\$4bo\$3bo\$3b3o5\$2o\$2o!`

16.118
`x = 18, y = 12, rule = B3/S232b2o\$bobo\$bo\$2o3\$3b2o12bo\$3b2o10b3o\$14bo\$9b2o3b2o\$9bobo\$9bo!`

20.3424
`x = 13, y = 23, rule = B3/S232o\$o\$2bo\$b2o5\$5bo\$4bobo\$3bo2bo\$4b2o3\$11bo\$10bo\$10b3o5\$8b2o\$8b2o!`
Ivan Fomichev

codeholic
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Posts: 1141
Joined: September 13th, 2011, 8:23 am
Location: Hamburg, Germany

### Re: Brute-forcing an eater 2 seed

codeholic wrote:Figure eight...

Hmm, this brings up some interesting possibilities for constructible circuitry. The smallest known G-to-H converter is a p8 device -- nine still lifes and a figure eight -- much cheaper to construct than a Silver-reflector-based stable G-to-H, and really just as good as a still life from Golly's point of view, since it's a power-of-two period.

Here's an old p8N regulator that uses figure-eight reflectors, for example. If regulator functionality were actually needed in self-constructing circuitry for some reason, it could pretty easily be adjusted to be more Spartan. In its current form it converts arbitrary inputs (in this example from a p1419 gun on the right) into output gliders timed in multiples of 712 (the period of the gun at the bottom with the two Herschel transceivers).

`#C p8N regulator: minimum driving period is 712 generations,#C minimum safe spacing between input gliders is 1414 generations#C Dave Greene 2 May 2003x = 373, y = 254, rule = B3/S23157booboo37bo\$157booboo35b3o\$196bo\$157b5o24boo8boo\$157bo4bo24bo\$160bobbo23bobo\$132bo27boobo24boo\$132b3o10boo10bo5boboobo5bo27boo\$135bo9boo9bobo4boboboo5b3o25boo\$124boo8bo21bobbobboobo11bo\$125bo8bo22boo6bo10boo\$125bobo9b3o25b3o\$126boo6bo5bo27bo33boo\$133bo3bo6boo21boo33boo\$122boo9bo5boobbobbo\$122bo10boobobo4bobboo\$124boboo7boo5bobboo\$123booboo14b4o\$178boo\$123booboo50boo\$124bobo30boo45boo\$124bobo30boo45bo\$125bo76bobo\$202boo\$135boo\$135boo\$\$154boo\$154bo\$155bo\$154boo3\$149boo\$149bobo32boobo\$151bo32boboo\$151boo\$\$200boobo\$200boboo\$\$193boo\$193boo\$141boo\$141boo\$\$132boobo\$132boboo88boo\$224boo\$183boo\$74bo77boo30bo\$152bo31bobo35boo\$72bob3o73bobo32boo35boo\$74boobo8bo63boo57boo\$74boboo6b3o123bo\$75b3obo3bo126bobo\$83boo51boo73boo46bo\$77bo57bobo65boobboo50b3o\$81bo15bo37bo67bo3boo53bo\$80bobo13bobo35boo65bobo57boo\$81boobboo8bo3bo101boo122bo\$85boo7bo3bo186bo37b3o\$93bo3bo185b3o13bo22bo\$67boo5boo16bo3bo185bo16b3o20boo\$68bo5boo17bobo186boo18bo\$68bobo23bo125boo79boo39boo\$69boo19bo48boo79boo29boo89boo5boo\$73boo14bobo48bo110boo96boo\$48bo23bobo14boo46b3o\$47b3o23bo19boo42bo\$46b3obo17b3o22bobo69boo73bo87boo17boo\$47bo3bo8bo10bo16boo5bo69bo73bobo87bo17boo\$48bo3bo5b3o6bo3bo16boo5boo66bobo17boo15boo37boo50boo36bobo21boo\$49bob3o3bo8bobobbo91boo17bobo15boo46boo41boo37boo21boo\$50b3o4boo5bobbobo112bo65bo19boo\$51bo12bo3bo112boo66bo17bobo\$55bo8bo73bo109boo17bo\$54bobo8b3o70b3o72boo51boo10boo\$55boobboo80bo48boo21boo64bo\$59boo43bo35boo49bo84b3o9boo32boo\$102b3o57boo27bobo82bo11bo20boo11boo\$101bo60bobo27boo95bo20bo\$101boo61bo123boo17b3o\$86boo76boboo139bo\$81boo4bo51boo18booboboboo\$81bo5bobo48bobo18booboo162boo\$79bobo6boo10bo37bo188bo28boo\$79boo18bobo35boo20booboo160b3o29bo\$75bo23bobo58bobo161bo29bobo\$74bobo23bo4boo53bobo191boo\$74bobo11boo15bobo49booboo\$75bo8boobobo17bo9bo39bobo65bo\$84boobo19boo7b3o40bo26boo35b3o\$87bo27bob3o39boo25boo34bo\$87boboo23bo3bo103boo\$85boboboo22bo3bo\$85boo25b3obo143boo\$25boo5boo79b3o75boo67boo\$26bo5boo80bo76boo\$26bobo35boo31boo11bo76boo\$27boo36bo31boo10bobo75boo\$31boo32bobo41boo225boo15boo\$30bobo33boo45boo116boo102bobo15boo\$31bo81bobo77boo36boo102bo\$84boo22boo5bo77boo13boo124boo\$27boo50boobobbo22boo5boo90bobo\$25boboo50booboo123bo\$24bo181boo10boo\$27bo51booboo135bo\$23boobo53bobobboo129b3o9boo\$23boo55bobo3bo58boo69bo11bo3bo\$81bo4bobo56boo7boo73b4o\$87boo65bo209boo\$152bobo33bo9bo15boo11b4o133bo\$77boo73boo4boo28b3o5b3o15bo12bo3bo130bobo\$77bobo4bo51boo20bo17boo13bo3bo16bobo15boo130boo\$79bo3bobo51bo18bobo17bo13boo3boo15boo139boo\$79boobbobo51bobo16boo19bo175boo\$32b3o47booboo51boo36boo\$32b3o262bo\$32b3o10bo36booboo189boo19b3o\$35b3o5b3o34bobboboo189boo7bo14bo22bo\$35b3o4bo37boo201b3o13boo20b3o13boo\$35b3o4boo177boo59bo37bo17bo\$98boo73boo46boo59boo36boo15bo31bo\$40bo57bobo72boo69boo91boo28b3o\$39bobo25boo31bo143bobo43boo74bo\$40boobboo21boo31boo144bo28b3o12bo75boo\$44boo188boo10boo27bobbo9bobo\$144boo88bo40bobbo9boo\$79boo59boobboo78boo9b3o35boobobbo\$75boobobo58bobo62boo19bo11bo34bobobobbo50boo\$75boobo60bo23boo19bo6boo11bobo17bo50boobo51boo\$78bo59boo23bo18b3o6boo13bo17boo27boo23bo\$57boo19boboo82b3o14bo24boo44bobo18bo3bo91boo\$58bo17boboboo8bo75bo14boo69bo22bo93bobo\$58bobo15boo11bobo159boo118bo\$59boo4bo23bobo279boo\$64bobo23bo208boo32boo\$51boo11bobo18boo212boo11boo20bo\$47boobboo12bo10boo6bobo225bo20bo15boo8boo3boo\$46bobo27bobo5bo191boo35b3o17boo14bo9boo3boo\$43boobbo30bo4boo187boobboo37bo34b3o\$78b3o190bobo78bo\$42bo3bobboo12boo16bo177boo10bo23boo\$41bo4bobbo14bo15boo178bo9boo23bo\$40bobobo5b3o8b3o193b3o36b3o\$39bobobo8bo8bo195bo40bo\$37bo4bo\$37bo3bo\$\$39boo14bo\$4boo5boo42b3o39bo\$5bo5boo45bo36b3o\$5bobo49boo35bo\$6boo86boo\$10boo10bo7bo46boo\$9bobo10boo4b3o47bo\$6boobbo11boo3bo50bobo\$23bo3boo50boo\$5bo3bo\$4bo4bo\$3bobobo\$bbobobo92boo\$o4bo93bobo13bo\$o3bo96bo13boo\$101boo11boobo\$bboo32boo75bobb3o\$36boo74bobobo\$24boo85bobobo\$23bobbo82b3obbo\$18boo4boo65boo17boboo\$17bobo71boobboo14boo\$17bo77bobo10bo3bo\$16boo54boo23bo9bobo\$26boo38boo5bo23boo8boo\$26bo39bobob3o38boo\$27b3o29boo7bobo40bobo\$29bo11boo16boo7boo36boo5bo\$37boobboo63boo5boo\$36bobo\$37bo\$33bo\$32b3o4boo\$31bob3o3bo\$30bo3bo5b3o\$29bo3bo8bo\$28b3obo\$29b3o\$30bo\$\$112boo\$92boo18boo\$90bobbo\$\$90bobbo20boo\$91bobbo19boo\$92bobo32boo\$93bo33bo\$125bobo\$24bo27bo9bo29boo31boo\$22b3o27b3o5b3o29boo35boo\$21bo18boo13bo3bo69boo\$21boo17bo13boo3boo\$41bo\$40boo\$\$6boboo\$6boobo78bo\$87boo27boo\$86bobbo26boo\$37boo48boo34boo\$37boo83bobbo\$8booboo110boo\$8bo3bo84bo\$9b3o84bobo\$11bobo83boo\$12boo74boo\$68boo19bo\$42bobbobbo6boo11bobo17bo\$42b7o6boo13bo17boo\$49boo19boo46boo3boo\$44boobbobbo65bobbobboo\$44boo3boo46boo19boo\$79boo17bo13boo6b7o\$80bo17bobo11boo6bobbobbo\$79bo19boo\$79boo55bo18boo\$70boo57boo3bo3bo16bobo\$70bobo55b3o3bo22b3o\$71bo57bo3bo5boo15bo3bo\$132boo6bo15booboo\$140bo\$46boo34boo46bo5boboo\$46boo34boo46boobbo\$45bo86boo\$46boo111boboo\$46boo111boobo\$\$127boo\$127bo\$92boo14boo3boo13bo17boo\$38boo53bo15bo3bo13boo18bo\$38boo50b3o13b3o5b3o27b3o\$42boo46bo15bo9bo27bo\$41bobo\$41bo\$40boo\$53boo\$53boo3\$55boo\$55boo!`

P8 circuitry could manage slow-salvo construction of still lifes with no problem, since intermediate targets are at most P2 -- you just need four sets of ways to make gliders, for even- and odd-parity gliders on black and white squares, with at least one op in each set.

The problem would be with using p8 circuits to construct more figure eights. To be able to slow-build multiple figure eights synchronized with each other in a Herschel circuit, it might end up being necessary to have sixteen different glider-output elbow ops, eight for each color.

That sounds a bit troublesome -- not as bad as the p30 case would be, but definitely a headache... it's exactly what originally pushed me strongly toward stable (and Spartan) self-constructing circuitry.

It's certainly possible to work around this problem using just the four [even/odd, black/white] op sets, though. Just collect small one-time turner / rephaser constellations to get the seven required timing changes for the figure-eight seed's final trigger glider. Just a question of whether the smaller more efficient p8 circuitry is worth all the extra construction complexity.

codeholic wrote:16.117...16.118... 20.3424

You seem to have switched from hunting eater2 seeds to looking for dead-spark-coil seeds for constructible Herschel transmitters. The first one in particular looks very usable. I'll have to look again for places where Herschel transmitters and receivers have a clear advantage over plain old Silver reflectors.

dvgrn
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### Re: Brute-forcing an eater 2 seed

Speaking about non-stable circuitry... I thought about p30 construction arms and came up with an idea (which is probably not new), that bigger variety of glider pairs (or sets) can be obtained just by having some glider hasslers of different period on construction lanes, e. g. of period 8. That's the reason why I opened Glider hasslers topic, that hasn't attracted much attention so far.

I tried to find an (at least theoretically constructible) p8 hassler, that would work only in certain phases, but no luck with common oscillators of period 8 so far

I've just realized, that there is (I'm pretty sure about that) a simple twin-bees-based p46 glider hassler (EDIT: I've found one), that one can use for this purpose. Or, vice versa, one could try p46 circuitry while using the "pentadecathlon buckaroo" for hassling gliders.

P. S. I doubt, that this reaction is new, but it seems strange to me, that it is not mentioned in the wiki, that the twin bees shuttle can convert a glider into a clean Herschel.
`x = 40, y = 15, rule = LifeHistory21.2A\$11.2A7.A.A15.2A\$11.2A7.A17.2A\$20.3A4\$2.D17.3A\$D.D17.A17.2A\$3D17.A.A15.2A\$D20.2A2\$6.2A\$7.2A\$6.A!`
Ivan Fomichev

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Posts: 1141
Joined: September 13th, 2011, 8:23 am
Location: Hamburg, Germany