Gomoku
Gomoku, also called "Five in a Row", is an abstract strategy board game. It is traditionally played with Go pieces (black and white stones) on a Go board, using 15×15 of the 19×19 grid intersections. Because pieces are not moved or removed from the board, Gomoku may also be played as a paper-and-pencil game. The game is known in several countries under different names.
Go (game)
In the opening stages of the game, players typically establish positions (or "bases") in the corners and around the sides of the board. These bases help to quickly develop strong shapes which have many options for "life" (self-viability for a group of stones that prevents capture) and establish formations for potential territory. Players usually start in the corners because establishing territory is easier with the aid of two edges of the board. Established corner opening sequences are called "joseki" and are often studied independently.