We're overlapped on the same tack — can the leeward boat head up on me?
Yes, as long as she stays at or below her own proper course. Under Rule 11 the windward boat must keep clear of the leeward boat. Heading up to sail inshore out of the tide can be the leeward boat's proper course, so Rule 17 doesn't stop her — and the windward boat, with room and time to keep clear, must do so. (World Sailing Case 14.)
<iframe width="560" height="315" src="https://www.youtube.com/embed/Evjmr1VdIGU" 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/Evjmr1VdIGU/">Source: Sailing Kiwi</a></p>Recommended reading
- The Rules in Practice 2025–2028 by Bryan Willis — The clearest guide to the racing rules around the racecourse — updated for the current 2025–2028 rulebook.
- Advanced Racing Tactics by Stuart H. Walker — The classic deep-dive on racing tactics — starting, beating, reaching and mark rounding.
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