ऋच्छत्यॄताम्

Operational rule vidhi

There is गुण in the लिट् (Perfect Tense) of 1. ऋच्छ् 2. ॠ and roots ending in long ॠ.

Word by word (padaccheda)

Target ऋच्छत्यॄताम् ṣaṣṭhī · bahuvacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

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Full reading

ऋच्छत्यॄताम्

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

There is गुण in the लिट् (Perfect Tense) of 1. ऋच्छ् 2. ॠ and roots ending in long ॠ।
As आनर्च्छ, आनर्च्छतुः, आनर्च्छुः from ऋच्छ्, आर, आरतुः, आरुः from ऋ, and नि चकरतुः, नि चकरुः, नि जगरतुः, नि जगरुः from कॄ and गॄ ॥ ऋच्छ् not having a light vowel in the penultimate, would not have received guna by 7.3.86, this sutra ordains it; roots in long ॠ never received guna, but इर् substitution; this ordains guna. The Vriddhi of 7.2.115 supersedes this rule, within its own jurisdiction, a prior superseding the posterior: as निचकार, नि जगार ॥

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