The niṣṭhā ta is changed to na after div when the sense is not that of 'play'.,
The word विजिगीषा means \desire of conquest or gain\, but here it means \gambling\.
Thus आद्यूनः, = औदरिकः, परिद्यूनः क्षीणः ॥ Why do we say. \when it does not mean to play\? Observe द्यूतं वर्तते ॥ Here the throwing of dice is with the desire of winning or gaining victory (vijigisha) over the opponent.,