Calculated Risk is an useful way to add tension to a game. Players weigh the odds, and decide either to risk losses for possible gains, or play it safe and keep what they have.
This principle was encountered while trying to create a ?NonPlayerCharacter mechanism for a BoardGame prototype. Instead of secretly drawing a card, a player, at the end of his turn, would choose one of the NPCs and flip over the top card of the pile. The NPC would perform the specified action (many times detrimental to the players) and then the player would take the card into his hand. The player could continue doing this as many times as he felt comfortable doing so. This particular comfort level might vary from player to player, but it always made card drawing an exciting time. (It also made for a rather long TimeBetweenTurns, so the mechanism was eventually dropped.)
This rule is likely at the heart of ?Gambling games. Even though any mathematician or economist could tell you that the games are fixed to favor the house, huge numbers of people continue to play them. To these people, the chance, however small, of hitting the big Jackpot is worth the chance, however large, of losing money. Many of these people will tell you that this risk is exciting, and even the responsible players consider their loses more like fees for having a good time. That many gambling games, which are quite popular, are almost entirely calculated risk should be sufficient cause to consider the concept.
Examples:
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Most war games use calculated risk at a small scale. Each battle involves a luck factor. Superior forces make victory more likely, but not guaranteed. Likewise, even the underdog has a chance, and therefore a reason to keep fighting.
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Chess is a game of perfect information with no chance a particular move failing to occur. How the move plays out in relation to the opponent's moves, is what makes the game interesting.
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?CollectibleCardGames involve a risk in what cards will come up. A player making a deck must decide whether to use multiple copies of cards to help assure their occurrence, or a greater variety, making the deck able to handle more situations.
A good formal overview of some of the principles behind this rule can be found in ![[WWW]](/wiki/classic/img/moin-www.png){kind=small}
The Psychology of Choice, (free registration required) by ?John Hopson, at Gamasutra.
Therefore, imbue the MeaningfulChoices of the game with a chance of that they will not have exactly the expected result.
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