Question: What award was won in 1973 by the actress that played a character in a horror film based on a novel by Peter Blatty?

Context articles: Mastermind (film)
The Exorcist III
The Ninth Configuration
Regan MacNeil
The Exorcist (film)
Exorcist II: The Heretic
Linda Blair
William Peter Blatty
Pazuzu (The Exorcist)
The Exorcist (novel)

Mastermind is a Charlie Chan spoof filmed in 1969 that sat on the shelf for seven years before receiving a limited theatrical release in 1976.
 It has developed a cult following in recent years since making its home video debut.
 The second of producer Malcolm Stuart's two-picture deal with screenwriter, William Peter Blatty, the project was inspired by the success of the 1964 Peter Sellers comedy, A Shot in the Dark which Blatty had co-written with producer/director Blake Edwards.
 Blatty's script was drastically revised by Ian McLellan Hunter prior to production and the disgruntled screenwriter chose the pseudonym of Terence Clyne for his screen credit.
 By 1973 it had recorded a loss of $2.9 million.
 Blatty's original screenplay was published as part of a limited edition collection by Lonely Road Books in 2013 under the title, Five Lost Screenplays by William Peter Blatty.
The Exorcist III is a 1990 American supernatural horror film written and directed by William Peter Blatty.
 It is the third installment of "The Exorcist" franchise and a film adaptation of Blatty's novel, "Legion" (1983).
 The film stars George C. Scott, Ed Flanders, Jason Miller, Scott Wilson and Brad Dourif.
 This is the only "The Exorcist" film not to be distributed theatrically by Warner Bros., though Warner Bros. subsequently gained international distribution rights.
The Ninth Configuration (also known as Twinkle, Twinkle, "Killer" Kane) is a 1980 American psychological drama film directed by William Peter Blatty.
 It is based on Blatty's novel "The Ninth Configuration" (1978), which was itself a reworking of an earlier version of the novel, first published in 1966 as "Twinkle, Twinkle, "Killer" Kane!"
.
 The initial 1966 publication of the novel featured an exclamation mark at the end of the title, while all subsequent publications saw it removed.
Regan Teresa MacNeil (born November 11, 1961; adaptations: c. September 1963) is a fictional character from William Peter Blatty's horror novel and film, "The Exorcist" and its first sequel, "".
 In both films, she was portrayed by Linda Blair.
The Exorcist is a 1973 American supernatural horror film, adapted by William Peter Blatty from his 1971 novel of the same name, and starring Ellen Burstyn, Linda Blair, Max von Sydow, and Jason Miller.
 The film is part of "The Exorcist" franchise.
 The book, inspired by the 1949 exorcism of Roland Doe, deals with the demonic possession of a 12-year-old girl and her mother's attempts to win back her child through an exorcism conducted by two priests.
 The adaptation is relatively faithful to the book, which itself has been commercially successful (earning a place on "The New York Times" Best Seller list).
Exorcist II: The Heretic is a 1977 American supernatural horror film directed by John Boorman and written by William Goodhart.
 It stars Linda Blair, Richard Burton, Louise Fletcher, Max von Sydow, Kitty Winn, Paul Henreid and James Earl Jones.
 It is a sequel to William Friedkin's 1973 film "The Exorcist" based on the 1971 novel by William Peter Blatty and the second installment of "The Exorcist" franchise.
 The film is set four years after the original film and centers on the now 16-year-old Regan MacNeil, who is still recovering from her previous demonic possession.
Linda Denise Blair (born January 22, 1959) is an American actress and animal rights activist.
 Blair is best known for her role as the possessed child, Regan, in the film "The Exorcist" (1973), for which she was nominated for an Academy Award and won a Golden Globe.
 She reprised her role in "" (1977), for which she was nominated for a Saturn Award.
William Peter Blatty (January 7, 1928 – January 12, 2017) was an American writer and filmmaker best known for his 1971 novel "The Exorcist" and for the Academy Award-winning screenplay of its film adaptation.
 He also wrote and directed the sequel "The Exorcist III".
 After the success of "The Exorcist", Blatty reworked "Twinkle, Twinkle, "Killer" Kane!
" (1960) into a new novel titled "The Ninth Configuration", published in 1978.
 Two years later, Blatty adapted the novel into a film of the same title and won Best Screenplay at the 1981 Golden Globe Awards.
 Some of his other notable works are the novels "Elsewhere" (2009), "Dimiter" (2010) and "Crazy" (2010).
Pazuzu is the main antagonist in "The Exorcist" horror novels and film series, created by William Peter Blatty.
 Blatty derived the character from Assyrian and Babylonian mythology, where Pazuzu was considered the king of the demons of the wind, and the son of the god Hanbi.
 In "The Exorcist", Pazuzu appears as a demon who possesses Regan MacNeil.
The Exorcist is a 1971 novel by American writer William Peter Blatty.
 The book details the demonic possession of twelve-year-old Regan MacNeil, the daughter of a famous actress, and the two priests who attempt to exorcise the demon.
 Published by Harper & Row, the novel was the basis of a highly successful film adaption released two years later, whose screenplay was also written by Blatty, and part of "The Exorcist" franchise.