Hard — logic-grid deduction puzzle
The work sheet for the diving boards went through the wash, so Everard, Elowen, Edmund and Eulalia must piece their week together from memory.
Once a year the aquatics centre shuts for a week so the diving boards can be put right. There are four of them: two low springboards, at 1 and 3 metres, and two high boards, at 5 and 10 metres. Everard, Elowen, Edmund and Eulalia each took one board and swapped out one worn part, each on a different day: Monday, Tuesday, Wednesday or Thursday. Somebody left the signed work sheet in an overalls pocket, and it went straight through the wash. Now all the crew has is what they can remember over a cup of tea. Can you help them put the week back together?
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