[INDOLOGY] Jaya with double genitive?

[Martin Gansten]

In an astrological text of which I so far have only a single manuscript, 
I recently came across an expression which may be in need of emendation 
or may just be an idiom I haven't seen before:

aśvadvayasya madhye ko vijayī lagnabhāji horeśe |
yaḥ prathamaṃ hṛdaye ’bhūt tasya jayo ’nyasya vaktavyaḥ ||

'Out of two horses, which will win? If the ruler of the hour occupies 
the ascendant, the one that first occurred in the [querent's] heart 
should be predicted to win /over the other/ (?).'

It is the double genitive in /tasya jayaḥ anyasya /that I am uncertain 
about. Can anyone confirm (or deny) that this idiom exists?

Best wishes,
Martin Gansten
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