Difference between revisions of "Rules"

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== Shape of the board ==
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The [[Board|Hex board]] is composed of [[hexagon]]s arranged in an ''n'' × ''n'' [[Wikipedia:Rhombus|rhombus]], where ''n'' is an integer greater than zero. This allows for Hex to be played on boards of various [[Board size|sizes]], with the most common being 11 × 11, 13 × 13, and 19 × 19. The [[edge]]s of the board are colored with two colors, with parallel edges having the same color. The board is empty at the start of the game. On the left you can see an empty Hex board.
The [[Hex]] [[board]] is composed of [[hexagon]]s, arranged in an ''n × n'' [[Wikipedia:Rhombus|rhombus]], where ''n'' is an integer greater than zero. Thus Hex can be played on boards of different sizes. Currently, 11x11, 13x13 and 19x19 are the most common boards. See the article [[Board size]] for more.
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Here is an example of a very small board:
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<hexboard size="5x5" float="left" />
  
<hexboard size="5x5" />
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Hex is played by two [[player]]s, who take turns placing a single stone on the board. One player uses red stones and the other uses blue stones. The objective of the game is for a player to build a solid chain between their designated edges (red for one player and blue for the other). The game is guaranteed to end with a winner as it is impossible for one player to surround one edge of the opponent without connecting their own two edges. On the right you see an example of a win by the player who placed the red stones.
  
== Playing the game ==
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<hexboard size="5x5" float="right" contents="R d1 B e1 R c2 B d2 R c3 B d3 R c4 R d4 B b5 B c5 R d5" />
Hex is played by two players, who take turns placing pieces on the board. The players have different colours, say red and blue. (The players themselves are sometimes referred to as [[Red (player)|Red]] and [[Blue (player)|Blue]]) The four [[Edge|edges]] of the board are coloured with the same colours, in such a way that parallel edges have the same colour. Red wins if he can build a continuous chain between the two red edges, and blue wins if he can build such a chain between the blue edges.
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Here is an example of a win by Red:
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To balance the game, the "[[swap rule]]" or "pie rule" is used at the start of the game. The first player places a red stone on the board, and then the second player chooses which player will use the red stones and which will use the blue stones. This ensures that the first player does not have a significant advantage.
  
<hex>
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Overall, the strategy of the game is to connect one's designated edges while preventing the opponent from doing the same. Detailed strategies can be found on the [[strategy]] page.
R5 C5 Q1 B:on
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Rc3 Bb5 Rd4 N:on c4 d3 d5 c5 c2 d2 d1 e1
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</hex>
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== The [[swap rule]] ==
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[[Category: Definition]]
The above rules give a strong advantage to the [[first player]]. Because of this, the [[swap rule]] was introduced. The swap rule is also called the "Pie rule", since it resembles the ''You cut, I choose'' rule when sharing a pie between two children. Suppose that Red is to make the first move. Then the first player places a Red piece on the board, in any cell he likes. After that, the second player decides who will play Red and who will play Blue. Then whoever was decided to be blue makes the next move, and the game continues normally.
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[[Category: Rules and Conventions]]
 
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== Beyond the rules ==
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For more information on how best to utilize the rules, see [[Strategy]].
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[[Category:Definition]]
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Latest revision as of 14:01, 20 January 2023

The Hex board is composed of hexagons arranged in an n × n rhombus, where n is an integer greater than zero. This allows for Hex to be played on boards of various sizes, with the most common being 11 × 11, 13 × 13, and 19 × 19. The edges of the board are colored with two colors, with parallel edges having the same color. The board is empty at the start of the game. On the left you can see an empty Hex board.

abcde12345

Hex is played by two players, who take turns placing a single stone on the board. One player uses red stones and the other uses blue stones. The objective of the game is for a player to build a solid chain between their designated edges (red for one player and blue for the other). The game is guaranteed to end with a winner as it is impossible for one player to surround one edge of the opponent without connecting their own two edges. On the right you see an example of a win by the player who placed the red stones.

abcde12345

To balance the game, the "swap rule" or "pie rule" is used at the start of the game. The first player places a red stone on the board, and then the second player chooses which player will use the red stones and which will use the blue stones. This ensures that the first player does not have a significant advantage.

Overall, the strategy of the game is to connect one's designated edges while preventing the opponent from doing the same. Detailed strategies can be found on the strategy page.