Having booked a half board (breakfast + dinner), tourists receive a two-time meal, which is provided according to their stay and is calculated as well as living - days. That is, on the day of arrival, tourists can have lunch or dinner (if the hotel allows you to change dinner for dinner), and on the day of departure they receive only breakfast, that the day of arrival and departure is one day in which they received half board. Accordingly, lunch is not allowed for tourists on the day of departure, but only breakfast.

The hotel can provide lunch, or may not provide. This should be informed in advance. The decision depends on the hotel.

No, they do not have the right to eat on the day of eviction. When booking a half-board meal, lunch or dinner is provided on the day of arrival. If tourists are late because of late arrival, this food is not compensated and can not be carried anywhere. In such cases you can try to book in advance for the first day the minimum type of food, and then "half board". Confirm whether or not it depends on the conditions of the hotel booking and the tour operator.