I tacked onto starboard right in front of him — why am I in the wrong?

Under Rule 15, when you acquire right of way (by tacking, gybing, or because the other boat changes course) you must initially give the other boat room to keep clear. You cannot tack into a position where the other boat has no chance to respond.

📖 Want Rule 15 in more depth? Elvstrøm Explains the Racing Rules 2025-2028 sets out every rule with plain-English explanations and diagrams. (affiliate link)

▶ Watch on YouTube ↓ Download (via YouTube)
<iframe width="560" height="315" src="https://www.youtube.com/embed/HjKIWZndlYc" title="Sailing Kiwi" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
<p><a href="https://sailing.kiwi.nz/v/HjKIWZndlYc/">Source: Sailing Kiwi</a></p>

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Next on this shelf — The Upwind Beat