Put in to bat by Andhra, Chhattisgarh lost an early wicket but one-down batsman Khare played a responsible knock of 136 not out with the help of 18 boundaries, while opener Sahil Gupta (30) also made important contribution at the top.
The two also put on a solid 67-run stand for the second wicket before Gupta got out.
Khare, however, continued to play his shots and shared an unbroken 169-run partnership for the fifth wicket with Abhimanyu Chauhan (73 not out) to put Chhattisgarh in command.
Andhra's CV Stephen took two wickets while giving away 44 runs.
Chhattisgarh 1st innings: 261 for four in 90 overs (Amandeep Khare 136 batting, Abhimanyu Chauhan 73 batting).
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