Very Hard — logic-grid deduction puzzle
Three drivers raced down a desert drag strip, and one of the starter's notes about the night was wrong.
Out past the last gas station, a straight strip of blacktop ran into the Nevada desert, and on cool autumn nights the whole valley came out to watch. Three local drivers took turns roaring down the quarter mile, one after another, while the crowd whooped from lawn chairs along the fence. Each driver brought a car with its own coat of paint, kept a lucky charm on the dashboard and wore a favourite jacket. The old starter waved the flag for every run and jotted notes in a battered notebook. By morning nobody could agree on who had done what, and the starter admitted with a sheepish grin that one of the notes was wrong.
Read the clues, rule out what cannot be, and prove what must be. Every GRIDIGMA puzzle is verified by a solver that shows the reasoning behind each step, so a solution is never a guess.
Logic grid puzzles: how to solve them, with a worked example