I want to know the answer to the following question:
Who was fighting for Tmutarakan following Yarsolav's death?
All the background I'm provided with is that "The rivaling Principality of Polotsk was contesting the power of the Grand Prince by occupying Novgorod, while Rostislav Vladimirovich was fighting for the Black Sea port of Tmutarakan belonging to Chernihiv.[citation needed]". Is that enough to answer the question?