When can a boat hail for room to tack? [Sailing Rules 2021-2024]

In World Sailing case 10, a boat hails another boat to windward of them for room to tack while they approach a third boat on the opposite tack. The boat that was hailed immediately tacks and protests the hailing boat. Which of the boats broke a rule? Subscribe for more videos on the racing rules of sailing:    / @racingrulesgeek   Check out the website for more content: https://racingrulegeek.com/ Sources: The Case Book for 2021-2024 The Racing Rules of Sailing for 2021-2024 Chapters: 0:00 / What was the situation in case 10? 0:38 / Which racing rules apply? 2:14 / Which boat broke a rule?