India held a firm grip in the opening Test and were inching closer to take a 1-0 lead in the two-match series against Bangladesh. Chasing a mammoth 513, Bangladesh were tottering at 272/6 at stumps on Day 4 with Shakib Al Hasan (40) and Mehidy Hasan Miraz (9) unbeaten at the crease at Zahur Ahmed Chowdhury Stadium in Chattogram on Saturday.