Quick reference (N.B.: I’m an sdk, so there might be mistakes):
type of enclosure -> invasion aji
1 small knight -> ko
2 small knights -> ko
1 large knight -> live
2 large knights -> live
1 one point jump -> live
1 one point jump + diagonal -> dead, but small corner or live and enclose
1 small knight + diagonal -> dead
1 small knight + diagonal, but diagonal is result of a kick -> dead, but with a nasty potential cut
1 small knight + 2nd line one point jump -> dead
1 small knight + iron pillar -> dead
Situation might change if one side is very thick near by.