The phrase "accurately guessed" is correct and usable in written English.
It can be used when referring to making a correct or precise estimation or assumption about something.
Example: "She accurately guessed the number of jellybeans in the jar during the contest."
Alternatives: "correctly estimated" or "precisely predicted".
In four separate experiments, participants more accurately guessed the pictured emotion based on body language — alone or combined with facial expressions — than on facial context alone.
He accurately guessed what audience members were thinking about (a dead cat called Candy), what actress Angela Griffin had in a sealed box (some big school pants, a piggy bank decorated by her daughter).
A few people have accurately guessed Ruth Bourdain's identity, but Mr. Friedland managed to deflect them, often changing his cellphone number, using voice-cloaking software to do radio interviews in character, and compelling editors and some reporters to sign nondisclosure agreements.
To make sure employees were being honest in their beliefs about others' compensation, the researchers, working with the bank's HR department, offered monetary rewards for employees who accurately guessed the average salaries of others.
Volunteers accurately guessed when the T-shirt belonged to someone extroverted, dominant, or neurotic.
Although the phone system was down, all the guests accurately guessed that the dinner had been cancelled.
Is it possible for people to accurately guess the pain number associated with each photo?
How the heck can you accurately guess when you'll die?
"Bologna on white," Lily accurately guesses, in a moment meant to reveal her deep grasp of human nature.
But the data needed to create software that can accurately guess at an individual cop's future actions is surely much scarcer.
Children who accurately guess how much was in their piggy bank get a prize, and free lollies are handed out when the coins are exchanged for banknotes.
