Unit 16 · Positional Constraint Deduction
Four Friends in a Car — Who Drives?
Lesson 4 of 6
About this lesson
Now for a 2D positional puzzle — four seats in a car arranged in a 2×2 grid. This is harder than a linear stack because constraints operate in two directions: "next to" means side by side in the same row, while "directly behind" means same column in a different row. Getting those directions right is the difference between a quick solve and a wrong answer.
Chapters
Question
Four friends are in a car with two seats in the front (left = driver, right = passenger) and two seats in the back (left and right).
The four friends are Aiden, Bea, Cal, and Dani.
- Aiden is either driving or sitting in the back-right seat.
- Bea sits directly behind the driver (same side, in the back).
- Cal is not in the back and is not sitting next to Dani.
Who is driving?
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