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 tactics
As explained in the section on important consequences of the basic rules, some formations of stones can never be captured and are said to be "alive", while other stones may be in the position where they cannot avoid being captured and are said to be "dead". Much of the practice material available to students of the game comes in the form of life and death problems, also known as "tsumego". In such problems, players are challenged to find the vital move sequence that will kill a group of the opponent or save a group of their own. "Tsumego" are considered an excellent way to train a player's ability at reading ahead, and are available for all skill levels, some posing a challenge even to top players.