Fast bowler Edwards took 2-11 as South Africa, who need 389 to win, stumbled to 45-3 at lunch on the fourth day.
The teams go into the game with the series deadlocked after three draws.
In India's title-winning ICC Women's World Cup, Richa scored 235 runs in eight innings at an average of 39.16 and a strike rate of over 133, with a brilliant, innings-saving 94 against South Africa as her best knock.
Opener Shikhar Dhawan was ruled out of the upcoming three-match T20I series against West Indies with an injury and was replaced by Kerala's wicketkeeper-batsman Sanju Samson.
Samuels and 19-year-old Trinidad all rounder Kieron Pollard were both named in a 15-man squad announced on Thursday.
Amit Mishra has been on roll for sometime now. Starting from the Asia Cup game against Pakistan, where he just gave 28 runs and picked up two wickets from his 10 overs.
Yashasvi Jaiswal is set to make his Test debut as an opener against the West Indies on Wednesday at Dominica, and this opportunity could not have come at a better time.
Andre Russell was denied a winning farewell as Josh Inglis and Cameron Green smashed unbeaten half-centuries to secure Australia's eight-wicket victory
India relied on their bowlers to stage a remarkable recovery scripting a comfortable 48-run win in the second cricket One-day international against the West Indies to level the five-match series 1-1 in New Delhi.
Inderjit Bindra, who raised Indian cricket on the world stage in the 1990s and early years of this century, passed into the ages on Sunday. 26 years ago, Mr Bindra spoke at length to Rediff about his vision for Indian cricket, an interview which we republish in his memory.
Rajneesh Gupta tells you all you need to know about India-West Indies Tests.
West Indies captain Chris Gayle top-scored with a swashbuckling 110 not out to lead his team to a seven-wicket victory over the host nation in the Canada Cup Tri-Series final in King City, Ontario on Sunday. The left-hander struck 14 fours and six sixes in only 77 balls as the title favourites cruised to 181 for three in reply to Canada's 179 all out in 46.5 overs.
India are slated to play four Tests on tour of West Indies starting May 15.
PCB chairman Shaharyar Khan on Wednesday made it clear that the series will bring the curtains down on the veteran batsman's international career.
'My focus is to keep motivating the guys so that we continue playing positive cricket and turn around our current situation.'
The Pakistan Cricket Board in a bid to attract more crowds to the Test match have for the first time announced free entry for several enclosures.
It is believed that if Saini stays back, it will help bowling coach Bharath Arun to invest more time in the 26-year-old Karnal-lad
Marco Jansen smashed the records held by legends Matthew Hayden and Vivian Richards for the most sixes hit by an overseas batter in a Test innings in India.
The Indian cricket team will take on the West Indies in a four-match one-day series in the Caribbean between June 26 to July 5.
The legendary Ricky Pointing has advised Australia all-rounder Cameron Green to keep things simple and not over analyse or tinker with his game in order to find the right approach in Tests.
Keen to complete the controversially-abandoned 2014 tour of India, the West Indies Cricket Board (WICB) has said it would host the Indians in 2016 if its players' association agrees to a commitment on the series.
Former champions India and West Indies cricket teams arrived in Kolkata on Monday amid tight security ahead of their World Twenty20 warm-up fixtures later this week.
Walcott, one of the three Ws in West Indies cricket with Frank Worrell and Everton Weeks, played 44 tests in his 12-year career from 1948.
West Indies batsman Marlon Samuels has been banned from bowling for 12 months by the International Cricket Council after undergoing testing on his action.
In a bit of relief for West Indies cricket, IPL chairman Ranjib Biswal has said its players will be allowed to compete in the cash-rich league, putting to rest speculations of them being ignored from the event after the team's abrupt cancellation of India tour.
Jadeja said he doesn't think too much about records but is always conscious of performing strongly with both bat and ball to justify his role in the team.
The venues for matches will be announced in April.
India made two changes in the line-up, Harbhajan Singh and S Sreesanth coming in place of VRV Singh and Irfan Pathan.
"They wanted to play a Twenty20 match on Nov. 17 before coming to Pakistan and asked us to reschedule the dates," a PCB official said.
Shubman Gill said he could not have asked for a better all-round performance from his team after they hammered the West Indies by an innings and 140 runs in the first Test.
Sri Lanka took three wickets in the last three overs to snatch a thrilling one-run victory over West Indies in the triangular one-day series on Wednesday. Niroshan Dickwella and Kusal Mendis both scored 94 runs as Sri Lanka posted 330 for seven from their 50 overs but for the second game running, West Indies worked themselves into a winning position before falling agonisingly short of their target as they finished on 329 for nine.
Sri Lanka need to win their final two games, and hope for favourable outcomes in England and Pakistan's next fixtures.
England captain Michael Vaughan says his team will need to raise the bar to beat Rahul Dravid's men in the three-Test series.