East fought their way back with Bengal seamer Shib Shankar Paul picking three for 11 to reduce Central to 74 for one at close.
Abbas Ali on seven and Naman Ojha, yet to open account, were at the crease when bad light ended play with nine overs remaining for the day.
Paul's effort, combined with that of Ranadeb Bose (1-44), served primarily as a fire-fighting exercise for East who elected to bat on a grassy wicket.
Against an attack that comprised four established seamers and two specialist spinners, the task was going to be that much difficult.
The decision, however, seemed justified when Shiv Sunder Das (34) and Arindam Das (31) added 66 runs for the first wicket, at a sedate pace though.
But three quick wickets by Yadav (5-29) pulled the rug from under East's feat. With Sanjay Bangar chipping in with two for 46, the visitors plunged from 66 for no loss to 87 for five.
The seamers -- Yadav, Harvinder Singh and Rudra Pratap Singh extracted disconcerting bounce from the pitch. It was also somewhat surprising why Mohammed Kaif did not open the bowling with Bangar who, even when the sun had come out in full, swung the ball significantly.
Mahendra Singh Dhoni began with a bang and ended with a whimper. He swung his bat at the very first ball he faced and the ball ballooned up over point for a four. But 10 balls later he was walking back to the pavilion after snicking Yadav to keeper Naman Ojha.
Prafulla Jaychandra and skipper Lakshmi Ratan Shukla were out in similar fashion, beaten by the swing of Bangar.
East then owed their total to Sanyal (62 not out) who shared two crucial partnerships with Chennai-born Assam batsman R Satish (12) and Sanjay Satpathy (21) to give semblance of respectability to the total.
Sanyal battled fire with fire as he struck six fours and a six during his 65-ball knock that spanned 99 minutes. He added 37 runs for the sixth wicket with Satish but he had better support from Satpathy with whom he shared a 55-run association for the seventh wicket in 56 balls and 38 minutes.
Spinners were almost not used with Murali Kartik bowling only three overs and Kulamani Parida two, as the seamers returned to make sure that tail did not wag long to spoil their day. The East innings ended half an hour before tea.