Ravichandran Ashwin claimed his second successive five-wicket haul as India skittled England out cheaply on day two to put themselves in total command of the second Test.
Fifteen wickets tumbled on what look more like a final-day pitch at M. A. Chidambaram Stadium on Sunday, with Moeen Ali (4-128) and Olly Stone both striking twice to bowl India out for 329.
The tourists, leading the four-match series 1-0, were dismissed for only 134 in reply, giving India a first-innings lead of 195 runs in Chennai.
Jack Leach got rid of Shubman Gill but first-innings centurion Rohit Sharma was unbeaten on 25 at stumps, with in complete control on 54-1 - leading by 249 runs.
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Ashwin followed up his six-wicket haul in the second innings of the first Test by taking 5-43 in a brilliant exhibition of spin bowling in dream conditions for the spinner, who generated sharp turn and bounce.
Ishant Sharma (2-22) trapped Rory Burns leg before without scoring and Dom Sibley fell for 16 after India added only 29 runs to their overnight total of 300-6.
Debutant Axar Patel (2-40) claimed the huge scalp of in-form England captain Joe Root, caught by Ashwin at short fine leg for only six to become the spinner's first Test victim.
England were reeling on 39-4 after Ashwin got big turn and bounce to see the back of Dan Lawrence and there were more roars from a crowd of 10,000 when the wily tweaker bowled Ben Stokes (18) early in the afternoon session.
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Ollie Pope made 22 before falling to Mohammed Siraj and although Ben Foakes (42 not out) played superbly against the spinners, England were all out from 59.5 overs when Stuart Broad was cleaned up by Ashwin.
Leach snared Gill lbw and Rohit successfully reviewed after he was given out in the same fashion but got an inside edge, while also possibly getting away with it when he padded up not offering a shot, but India are well on course to level the series.
