The simulation battle between the two old men did not reach its conclusion, because Theresa is a child with a particularly regular biological clock. Under Richard's meticulous care, although the girl hasn't stepped out of the shadows over the years and her constitution is weaker than her peers due to lack of exercise, she's still considered a healthy child.
She must eat three meals a day properly and rest on time when needed. No matter how much Richard spoils Theresa, these two rules are his bottom line.
For this reason, despite sneaking into the office across the hall on a whim, Theresa still became drowsy after a short burst of activity and was taken back by Richard to continue sleeping.
Of course, even if Theresa wasn't sleepy, the two men probably wouldn't have been in the mood to finish that simulation.
The reason goes without saying.
...
"Are you sure Theresa didn't look at your command console?"
