Meum et Tuum (mine and thine) is a centuries-old, legal concept of property rights; what's mine is mine and what's thine is thine (and we must respect the rights of each other).
But what seems simple is complex.
Who is the "me" and "you" of "mine" and "thine" -- individuals, estates, organizations, corporations, crown/state, everyone?
What do I, you, we own -- shoes, house, wife, medical records, reputation, body parts, browsing history, DNA?
How do we gain or lose "it" -- barter, sale, bequest, gift, wage labor, theft, copyright expiration, eminent domain, nationalization?
Unaccountable time and effort has been spent on the difficult problem of ownership.1
In the word game Meum et Tuum ownership of the tiles on the board frequently changes. As in the game of Reversi when you flank one or more of your opponent's tiles with two or more of yours, they become yours; thine becomes mine.
Blue played AIL.
Red places an F before and and S after AIL to form the word FAILS. (The F and S are displayed using black, the Temporary tile color, which distinguished them from tiles already on the board.) Blue's letters are now flanked by two new tiles.
The play earned 5 points: 2 for the two new tiles (F and S) and 3 for the A, I and L which Blue now owns. Red loses ownership of the A, I and L and, thus, 3 points.
Only new tiles and switched tiles earn points -- that is, increase the number of tiles you own on the board. Therefore, cross-words do not contribute to your score. However, they must be spelled correctly.
You receive no bonus for using all seven tiles in your tray to form a word (sometimes called a bingo).
The player with the highest score (owns the most tiles) at the end of a game is the winner.
1A similar, although non-legal, concept is that of "his'n and your'n." Oail Andrew "Bum" Phillips, an American football coach, praising the abilities of Don Shula (professional football coach) and Bear Bryant (college football coach), is reported to have said that "He can take his'n and beat your'n and take your'n and beat his'n."
Copyright © 2018 by George Tylutki. All rights reserved.