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Perrin Rynning's picture

Dice mods vs. dice pools.

All RPGs have to balance several different factors. One is letting the players feel like their characters have at least a calculable chance of accomplishing tasks at least partially outside of their (the characters' AND the players') control. Another is not making every task too easy to bother with. And a third is keeping things from being totally predictable; it's just as as undesirable to know with certainty that your character will succeed as it is to know that he/she/it will fail.

Dice mods make it easier to calculate the odds of success, because you have a firm grasp of the base probabilities. The mods themselves can be known or hidden ('cos the tricksy GM didn't mention that the dungeon's oxygen levels are rising, or something equally weird) but you know what your chances are to hit or exceed the success threshold on a single roll, and it's easier to adjust your calculations from there. (Bonus: does anyone reading this column remember "column shifts"? They used to be all the rage, and now no one uses them. Care to guess why?)

On the other hand, dice pools make probability calculations more complex, because no one die roll result equals automatic success or failure. I might suggest visualizing it as playing at six craps tables simultaneously, with the wagers on each table modifying all of the others. Thus, it becomes much more difficult to tell whether or not a character will succeed at any task calling for dice rolls.

I believe that dice pools do a better job of making it more difficult for the player to predict the outcome of any contest, but that dice plus modifiers make the game flow more smoothly. Ultimately, it remains a matter of player choice which tools to use in the service of having fun.

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