Why walking works:
Let's assume you want Nov 20, 2023 arrival to Nov 26 departure. Today, Nov 7, 2022, we are 11 months out from Oct 7, 2023. You could go online today and, if available, book the room you want for Oct 7 to Oct 13, 2023. That results in preventing anyone else from booking the room you have for the nights of Oct 7, 8, 9, 10, 11, and 12, 2023. That also prevents anyone from booking the room you have for any dates after Oct 12, 2023, until Nov 13,2023. Why? Because at 11-months out from any given arrival date, you cannot book any room that is already full for that arrival date, e.g., if you went online today and saw that the rooms are booked full for Oct 7, 2023, but open for all days thereafter, you could not possibly book a room for any of those open days.
Thus, if today you were to book Oct 7-13, 2023, you effectively block out everyone else from booking the room you have, not just for Oct 7 through Oct 12, but all dates thereafter, until Nov 13, 2022. Thus on Nov 12, 2022, your room will still be open for all dates after Oct 12, 2022. On Nov 12, 2022, at any time of the day, you can go online and modify the reservation for the room you already have by changing the start date to Oct 12 and departure date to Oct 18, 2023, with the same result of blocking everyone else from reserving the room you have for Oct 12 through 17, 2023 and all days thereafter. You would then modify your reservation on Nov 17, 2022 to Oct 17-23, 2023, then again on on Nov 22 to Oct 22-28, 2023, and continue that process until you have the actual dates you want.