Go is a japanese game similar in several ways to gomoku. It's played on the same board and with the same pieces, black always starts, and the two players take turns to place one piece on any unoccupied space of their choice (or, if a player chooses to do so, he may pass). However, in go the objective is not to make a line of five pieces, but to own more territory than the other player. I'll explain this in a second. The main way to acquire territory is to capture one or more of the opponent's pieces. This is done by surrounding said pieces (on all four sides but not necessarily on the corners), as in the following examples: Here Black captures one red piece, gaining one space (circle) of territory AND one point (for the piece he captured). If he had only surrounded a space without capturing any red piece, he would have gained one space of territory but zero points. Here Black captures seven red pieces and gains seven spaces of territory and seven points. It would be stupid to then fill in those seven spaces with pieces of his own, since that would take away the territory he gained. Here Black only captures seven pieces and gains seven spaces of territory. The other three red pieces aren't captured. Here black takes advantage of the edges of the board to surround several red pieces without using too many of his own pieces. Remember, every move is important, so the less moves you need to capture a group of enemy pieces the better.