बह्वेकपुत्रयोर्बहुपुत्र एकं दत्त्वा शेषप्रतिष्टब्धः संधिमतिक्रामति नेतरः ॥ कZ_०७.१७.२७ ॥
bahv-ekaputrayor bahuputra ekaṃ dattvā śeṣa-pratiṣṭabdhaḥ saṃdhim atikrāmati na itaraḥ
Between a king with many sons and a king with only one son, the many‑sons king—after giving one (son/hostage) and being secured by the remainder—will violate the treaty; the other will not.
Because the political cost is diluted: surrendering one heir does not endanger dynastic continuity, so the pledge has weaker deterrent value.
To estimate treaty reliability by comparing each side’s internal succession constraints and the credibility of pledged guarantees.