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GomokuGenre(s)Players2Setup timeMinimalRandom chanceNoneSkill(s) required, tacticsGomoku, also called Five in a Row, is an. It is traditionally played with 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.
The game is known in several countries under different names.Players alternate turns placing a stone of their color on an empty intersection. The winner is the first player to form an unbroken chain of five stones horizontally, vertically, or diagonally. This article needs additional citations for. Unsourced material may be challenged and removed.Find sources: – ( August 2007) Most variations are based on either Free-style gomoku or Standard gomoku.
Free-style gomoku requires a row of five or more stones for a win. Standard gomoku requires a row of exactly five stones for a win: rows of six or more, called overlines, do not count.Optional ('house') rules Black (the player who makes the first move) was long known to have a big advantage, even before L. Victor Allis proved that black could force a win (see below). So a number of variations are played with extra rules that aimed to reduce black's advantage. The rule of three and three bans a move that simultaneously forms two open rows of three stones (rows not blocked by an opponent's stone at either end). The rule of four and four bans a move that simultaneously forms two rows of four stones (open or not). Alternatively, a handicap may be given such that after the first 'three and three' play has been made, the opposing player may place two stones as their next turn.
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First gameThis game on the 15×15 board is adapted from the paper 'Go-Moku and Threat-Space Search'.The opening moves show clearly black's advantage. An open row of three (one that is not blocked by an opponent's stone at either end) has to be blocked immediately, or countered with a threat elsewhere on the board. If not blocked or countered, the open row of three will be extended to an open row of four, which threatens to win in two ways.White has to block open rows of three at moves 10, 14, 16 and 20, but black only has to do so at move 9.Move 20 is a blunder for white (it should have been played next to black 19). Black can now force a win against any defence by white, starting with move 21.