Minimum predecessors

[praosylen]

This thread is for determining the smallest predecessors (in population or bounding box) for various objects. Here are the smallest-population predecessors for the 33 most common objects (as determined by Catagolue) that I could find:

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x = 273, y = 10, rule = B3/S23
260bo$129bo82bo28bo19bo7bo$81b2o21b3o4bo16bo84bo26bo7b2o12bo$80bobo20b
o7bo6b2o7bo6b2o17b2o11b3o8bobo34bo2b2o6b2o13bo7bobo9b2o6b3o$41bo5bo23b
2o7bo7b2o3bo8bo7bobo5b2o6bo6bo8bo11bo22b2o5b2o6b2o8bo9b2o10b2obo11bo
10bo8bo$6bo12bo7bo5b2o7bo5bo6bo5b3o14b2o8bo5b2o5bo9bobo6bo5bo7bo2bo3b
4o9bo14bo8bo5bo7b2o8b2o4bo2bo7b2o2bo3bo9b2o13bo4bobo9bo$o4bobo4b2o8bo
4bo7bo4bo2bo5bo5b2o7bo8bo3bo8b2o6b2o5bo10bo7bo5bo8bobo5bo10bo15b2o13bo
bo6bo8b2o4bobo6bo9bo7bo15bo4b2o8bobobo$2o11b2o4b3o5b3o4b2o4b2o5b2o5bo
10bo4b3o4b2o7bo9bo4bo19bo4bo9bo16b2o14bo7b2o7b2o6bo2bo3bobo6bo7bo32bo$
7bo57bo61bo42bo6bobo15b2o6bo15bo$203bo!

I'm sure some (e.g. ship-tie, integral, shillelagh) could be improved. I haven't tried with bounding box yet.

Edit: Because I was stupid, I missed this one for the shillelagh:

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x = 5, y = 4, rule = B3/S23
4bo$3bo$2o2bo$ob2o!

[Billabob]

Some random rare objects:

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x = 54, y = 50, rule = Life
3bo17bo18b3o$3b2o15b2obo16b4obo$3bo20bo16bo3b2o$3o18bo25bo$2o20bob2o
19b2o4b3o$2b2o20bo20bo5bo$51bo14$2bo23bo15bo5bo$bo2bo15b2o4b2o12b2obo
4b2o$ob3o16bo4bo16bo4bo$21bob3o17bob3o$ob3o15b2ob2o15b2obob2o$bo2bo20b
2o15bo4b2o$2bo14$2o24b2o20b3o$2o4b3o38bo$6b2obo2b2o11bo2bo16bo5bo$6b2o
bobo10bo2b3o16b4o$8b3o3bo7bobo18bo$11bo2bo17b3ob2o7b3o$11bo2bo9bobo5bo
bobo5bo4bob2o$14bo6b3o2bo5b3obo5bobo$20bo2bo19b2o$21b2o!

Oh, and table-on-table.

There are also 2 predecessors to Achim's P8; One has 20 cells, and the other has 22 cells but takes longer to become the oscillator.