Ian07 wrote:The current cost of

xs18_0mmge96z1221 is 12 gliders, which is twice as many as anything else on the new version of the wiki's

list of common still lifes. Most of the sample soups boil down to this reaction:

Code: Select all

```
x = 20, y = 15, rule = B3/S23
2o4bo$2o3bo3bo$4bo4bo$4b2obo2bo$4b3ob3o$8bo4$18bo$17bobo$16bo2bo$11bo
5b2o$11bo$11bo!
```

If a 4G synthesis is found for the unstable object, this could reduce the cost to 4 + 2 (block) + 3 (loaf+blinker) + 1 (cleanup) = 10G.

Yes, but the reason for the high frequency is this 4G pattern:

Code: Select all

```
x = 5, y = 18, rule = B3/S23
3b2o$2bobo$3bo13$3o$2bo$3o!
```

Maybe a weird (early) clean up with some gliders improves the synthesis.

Edit1: an alternative

Code: Select all

```
x = 10, y = 20, rule = B3/S23
7bo$6bobo$9bo$4bobo$3b2o2bobo$4bo$9bo4$3ob3o$o5bo$o5bo$bo3bo$2b3o$6bo$
6bo$2bo3bo$2bo$2bo!
```

3G (2blinkers)+2G (pi) + 3G (dove) + cleanup.

or this one:

Code: Select all

```
x = 12, y = 13, rule = B3/S23
5bo$5bo$5bo2$7b3o2$2o$2o$9b2o$9b2o$11bo$9b2o$9b2o!
```

3G (2blinkers)+2G (pi) + 2G (block) + cleanup.

or this one:

Code: Select all

```
x = 25, y = 22, rule = B3/S23
21bo$20bobo$20bo2bo$21bobo$21b3o4$19b2o$18bobo$17bobo$17b2o$10bo$10bo$
10bo2$6b3o3b3o2$10bo$10bo$10bo!
```

with a costly long ship.

Edit2, sorry for posting a lot, but this one seems promising:

Code: Select all

```
x = 19, y = 8, rule = B3/S23
bo15bo$bo15bo$2bo15bo$2o14b2o$2bo2bo12bo$bo2bobo10bo$3bo2bo$4b2o!
```

a loaf plus a 7-bit phi-spark ancestor.