In “Impasse” (June, page 50), the diagram was mistakenly printed without arrows, making the puzzle impossible to solve. Here is the corrected diagram. Our apologies for the oversight.
June 2017 Correction: Impasse
In “Impasse” (June, page 50), the diagram was mistakenly printed without arrows, making the puzzle impossible to solve. Here is the corrected diagram. Our apologies for the oversight.