Turn-based strategy

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The Battle for Wesnoth, an example of a turn-based "tactics" game.

A turn-based game, also known as turn-based strategy (TBS), is a game where the game flow is partitioned into well-defined and visible parts, called turns or rounds. For example, when the game flow unit is time, turns represent units of time, like years, months, weeks, or days. A player of a turn-based game is allowed a period of analysis (sometimes bounded, sometimes unbounded) before committing to a game action, ensuring a separation between the game flow and the thinking process, which in turn presumably leads to more optimal choices. Once every player has taken his or her turn, that round of play is over, and any special shared processing is done. This is followed by the next round of play.

Most board games are turn-based, providing each player with an opportunity to act. Many single-player strategic video games are also turn-based. However, when a particular player gains access to the game during his/her turn it is not uncommon to value the time taken by the player to make the move in order to improve the fairness of the game (and to place an upper limit on the game length). In chess, a pair of stop clocks may be used to track the time taken by players to make their moves.

The term turn-based gaming can also be used to refer to browser-based gaming sites that allow for game-play to extend beyond a single session, over long periods of time—often taking months for complex games like Go or Chess to finish.

1 Types
2 Examples
3 See also

[edit] Types

Turn-based strategy games come in two flavors depending on whether, within a turn, players play simultaneously or take their turns in sequence. The former games fall under the category of simultaneously-executed TBS games (also called phase-based or "We-Go"), with Diplomacy being a notable example. The latter games fall into player-alternated TBS games (also called "I-Go-You-Go", or "IGOUGO" for short), and are subsequently subdivided into (A) ranked, (B) round-robin start, (C) random and (D) initiative-based -- the difference being the order under which players start within a turn: (A) the first player being the same every time, (B) the first player selection policy is round-robin, (C) the first player is randomly selected, and (D) the first player is selected based on an initiative score.

[edit] Clock-based games

An additional sub-category under phase-based games is the category of clock-based games. Clock-based games differ from phase-based games, in that players are usually allowed a maximum of only one action per turn, and the duration of a turn is determined by the length of time required to perform the action. Most roguelike games fall under this category.

[edit] Partially turn-based

Many other games that are not generally turn-based retain the notion of turns during specific sequences. Notably, the role-playing computer game Fallout is turn-based during the combat phase, and real-time throughout the remainder of the game. Other games, such as the Total War series, combine a turn-based strategic layer with real-time tactical combat.

[edit] Acting outside one's turn

Some games (notably X-COM) allow players to act outside of their normal turn by providing a means of interrupting an opponent's turn and executing additional actions. Typically, the number and type of actions a player may take during an interrupt sequence is limited by the amount of points remaining in the player's action point pool (or something similar) carried over from the previous turn. The Silent Storm game series includes an "Interrupt" statistic for each character to determine the likelihood of out-of-turn action.

[edit] Turn-based "tactics"

Main article Tactical role-playing game

This sub-genre is principally used to refer to RPG-derived games as an alternative to the traditional turn-based system. In such titles, the system has been tailored to incorporate role-playing game characteristics. The genre has its origins in tabletop role-playing games, where each player has time to decide his or her character's action. Turn-based tactics games generally feature no more than a dozen characters on either side of the battle (usually less). The term "tactics" was not widely used to describe such titles until Final Fantasy Tactics was released, where it popularized the genre in the U.S., although games such as Shining Force were part of the genre years beforehand.

[edit] Play-by-mail games

Play-by-email TBS games allow the orders to be passed in a very loose synchronization mechanism: email. In a way, it is the modern successor of the old play-by-mail style used in Europe in the mid-17th century: two chess players would be able to play together through delivered letters. PbeM examples: Atlantis PbeM or Dominions II.

[edit] Examples

[edit] Example board games

[edit] Example computer games

[edit] Mainstream developers

After a period of converting board and historic TBS games to computer games, companies began basing computer turn-based strategy games on completely original properties or concepts. The presence of a computer to calculate and arbitrate allows game complexity which is not feasible in a traditional board game.

Probably the best known turn-based game is Sid Meier's Civilization, which evolved into a long series of successor games and derivatives. Other examples include:

[edit] Indie game developers

Space War Online

A further market trend is the rise of "Indie" TBS games (games produced by small groups, independent or only somewhat affiliated with the major elements in the computer games industry). These games often extend or refine already existing TBS strategy games. Some examples of indie-developed games include:

[edit] Open-source games

Open-source has also seen the rise of games such as The Battle for Wesnoth. Directories like Freshmeat provide large lists of open-source, turn-based strategy projects.