From NWN wiki and also the actual in game guide:
"A character can only make a knockdown attempt on opponents that are one size category larger than himself, or smaller. "
Really? If I understand this correctly, a human can't knockdown another human, half-orc, or elf. But can knockdown a halfling, gnome or giant?
Is that a mistake?
Likewise a gnome can't touch a halfling but can have a go at flipping a human?

What confuses me even more is this about IKD:
"A character with this feat counts as one size category larger when he makes a knockdown attack. All other knockdown conditions still apply. "
A halfling or gnome with IKD can now try and flip other gnomes and halflings but not half-orcs and humans and elves?

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Low status stumpies read stumpymoose.com

You can knockdown your own size.

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Nysor Shorshanis: A squirrel in his own right
Solrend Inignus: The Kossuthian cleric who is "hot, but not in that way"
Adin Twitterleaf: Crazy elven trickster.
Isaac Kley: Young gimp of a sorcerer.

"A character can only make a knockdown attempt on opponents that are one size category larger than himself, or smaller. "

Here I shall illustrate: One size larger > you > smaller == One size large > All smaller sizes.

Since you can hit one size above your own and ALL sizes below that means that your own size is also BELOW the largest that you can hit.

For example. You could not KD the undoer.

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I keels u with my axe!

"Do ye know where the Holy-Flamin' Frost-brand Gronk-slayin' Vorpal Hammer o' woundin' an' returnin' an' Shootin'-Lightnin'-out-yer-bum is?"

Thanks. Can be locked

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Low status stumpies read stumpymoose.com