Translation of Akkosa Sutta: Insult - ."He who repays an angry man in kind Is worse than the angry man"
The Sujato translation is:

When you get angry at an angry person
Tasseva tena pāpiyo,
you just make things worse for yourself.
yo kuddhaṃ paṭikujjhati;
When you don’t get angry at an angry person
Kuddhaṃ appaṭikujjhanto,
you win a battle hard to win.
saṅgāmaṃ jeti dujjayaṃ.

I have zero competence in translating Pali but my mere guess is:

Tasseva (3rd person pronoun in genitive case; genitive means having possession) tena (because of) pāpiyo (sinful)
One has a sin/sinful because of
yo (one who) kuddhaṃ (accusative case is object of the verb; is provoked; is angered) paṭikujjhati (verb; is angry in return; pati + kudh + ya);
one (yo) getting angry/provoked in return (paṭikujjhati; verb) towards anger/provocation (kuddhaṃ; object of the verb)
Kuddhaṃ appaṭikujjhanto,
When one (yo) is not angry/provoked in return (appaṭikujjhanto) towards anger/provocation (kuddhaṃ)
saṅgāmaṃ jeti dujjayaṃ
one wins a battle hard to win.

Note: for Sujato, possibly &quot;tasseva&quot; is in dative case, which implies &quot;giving&quot; or &quot;making&quot;; rather than genitive case, which implies &quot;possessing&quot;.
While i cannot definitively translate the verse, my guess is the translation revolves around the 1st sentence: &quot;Tasseva tena pāpiyo&quot; and particularly who is the owner or maker of the &quot;pāpiyo&quot; (&quot;sinful&quot;).
My guess is the person getting angry in return possesses the &quot;pāpiyo&quot; because it appears the &quot;pāpiyo&quot; (&quot;sinful&quot;), together with the &quot;jeti&quot; (&quot;victory&quot;), are the main subjects or outcomes of the entire verse.
Therefore, I merely guess the Acharya Buddharakkhita &amp; Maurice O'Connell Walshe translations are the most accurate because the &quot;pāpiyo&quot; (&quot;sinful&quot;) is possessed by &quot;the person&quot; (&quot;tasseva&quot;) rather than possessed by Thanissaro's generalization of &quot;things&quot;. But I could be wrong.
Often, our Soviet &amp; European moderators are fluent with grammar and can assist, here.