राजनि युधिकृञः

Operational rule vidhi

The affix क्वनिप् comes after the verbs युध 'to fight' and कृ 'to make' with a past signification when the word राजन् 'king' is in composition, in the Accusative -2nd case.

Word by word (padaccheda)

Right context राजनि saptamī · ekavacanaLeft context युधि- कृञः pañcamī · ekavacana

Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

राजनि युधि-कृञः

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Commentary

The affix क्वनिप् comes after the verbs युध 'to fight' and कृ 'to make' with a past signification when the word राजन् 'king' is in composition, in the Accusative -2nd case.
How can the verb युध्, which is an intransitive verb, govern an object ? It is a transitive verb, in as much as it is taken to be a causative verb, with the णिच् affix latent. As राजयुध्वन्,1st. sing. राजयुध्वा 8.2.7 'who has caused the king to fight'; राजकृत्वन्, 1st. sing. राजकृत्वा (VI.1.71.) 'who has made a king'.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.