9. Four-player chess variants
Chess variants for four players. They play in two teams: Yellow and Red play against Green and Blue. The teammates support each other, and attack the other team together.
The game ends when someone gets checkmated. Then the checkmater team wins and the other team loses.
More detailed rules: Four-player chess. These variants differ only in the board and the movement of the pieces. The general rules are the same.
Martin Gruber’s Understanding SQL (originally published in 1990) and its follow-up, Mastering SQL
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The Internet Archive has a digital lending program. You can borrow the updated version for 1 hour at a time or 14 days if you have an account. Understanding SQL: A Comprehensive Guide by Martin Gruber
Imagine you're the librarian of a massive, magical library where books fly around and change shelves constantly. To find anything, you could wander the aisles for years, or you could use a "Magic Ledger" (SQL) Instead of running through stacks, you simply write a note: "Show me all blue books written by Gruber after 1990." Which of these would be most helpful for your studies
The primary resource associated with Martin Gruber's Understanding SQL