MERC: Make Every Roll Count

Intro: Keep it interesting!

RPGs evolve. New games don’t just invent snazzy new mechanics; they poke deep into questions of what game-table play is about.

MERC stems from author Ben Finney’s interest in the innovations of recent games, and ways to strengthen those concepts in the now-classic RPG GURPS. Broadly speaking, MERC is a set of guidelines for placing story first and making the most of gamers’ time at the table. More narrowly, it homes in on a key question at the heart of all RPGs: When should the dice be used at all, and toward what end? 

From the GURPS perspective, that often equates to “When should we make success checks?” The general answer to that is clear to gamers with minimal experience: “Roll where the outcome is meaningful and interesting. Roll to have the PCs survive a dangerous car chase, not to eat breakfast without spilling the orange juice.” We all know that, and MERC doesn’t contradict this truism.

But that said, a beginning GM won’t hurt for a more contemplative look at when to roll dice; even an experienced GM might freshen his games through a reexamination. More importantly, what MERC suggests actually may represent a new take on play for some gamers: A shift from many games’ focus on resolving tasks, to a focus on resolving players’ intent (with some crunchy GURPS-flavored dice-rolling guidelines to aid in that).

“What? I don’t have to write the whole adventure script by myself?”

MERC is almost as new to me as it is to you, Reader, so I need to try applying it at the game table. At present, it does appear to offer me food for GM thought. I see a call to de-emphasize resolution of tasks put in place by the GM as challenges to the characters, instead asking what the player wants to happen in the scene, and how the player will have the character act toward that goal. I see advice to ensure that every dice roll is there for a good, story-driving reason – as Ben puts it separately, “to ensure that every roll, before it’s made, has personal investment from at least two people at the table”. I see a suggestion for the GM to hand over some game control to the players, more so than classic RPG rules tend to prescribe.

Sharing the storytelling reins isn’t a new concept to me – I’ve certainly seen it spelled out in many forms in recent RPGs – but I know that I’ve been guilty of not taking that advice. I can recall games in which I’ve clung to old-school GMing, keeping players focused too tightly on their characters alone, because everything else is my responsibility as GM. That doesn’t mean we don’t have fun, but the mindset can lead to problems like railroading and an overworked GM. I think it’ll help my GMing to have insights from several modern games condensed into one set of guidelines tailored to my favored RPG, per Ben’s efforts.

The MERC guidelines begin below. Does this appear a useful framework for keeping conflict resolution interesting in any game? Or maybe only for some game styles? Or do you see potential problems lurking within? 


MERC guidelines

Intent-based task resolution for engaging play

  • Copyright: © 2008 Ben Finney <>
  • License:   Permission is granted to modify and/or redistribute this work in any form, provided this copyright notice and license grant are preserved in all copies.
  • Last-Updated:  2008-12-10 11:22

Say yes or roll the dice

Conflict is the only reason to roll the dice

If there’s no interesting conflict, say yes and keep moving

Whenever conflict occurs, use conflict resolution to determine the result


The GM is responsible for game world and NPCs

Players are each responsible for their characters

Everyone must offer contributions on areas outside their own responsibility

Collaborative storytelling

Nothing will happen unless you make it happen

Get all players involved in making scenes interesting

Character secrets are kept from other characters, never from other players

State intent

Acting player describes what success will look like

Set the stakes

Opposition (another player, or GM) describes what acting player’s failure will look like

Whiff is not an option

Something interesting happens to change or complicate active player’s intended result

Determine the task

Intent determines which ability will be tested on each side of the conflict

GM determines task difficulty modifiers

Acting player can:

Raise the stakes to change the nature of the conflict

Concede the opponent’s intent without conflict

Walk away, ending their involvement in the scene

Accept the conflict and roll the dice

Result must progress the story

Three possible outcomes (per Mouse Guard RPG): success, success-with-condition, failure-with-twist

Success ⇒ achieve intent as described

Nothing can change the fact that intent was successful as described by player

Margin of success can grant more than was described, but never less

Failure ⇒ opposition’s description occurs

Margin of failure can determine whether some degree of intent is achieved, but never complete

Can succeed at task while failing intent

Tie ⇒ deadlock

Neither side gets their intent

“Let it ride” (below) applies

  • If both sides agree, can be escalated to different stakes

Let it ride

Repeating rolls is boring, and doesn’t make sense if “whiff” results are eliminated

  • This idea is incompatible with ‘Repeated Attempts’, p. B348

Each ability only tested once per intent, task, and situation

Result, and margin, remains unchanged until situation significantly changes

  • Any change in result can only come from a significantly different intent, task, or situation

Applies only to intents achieved via a success roll or contest, not to extended conflict resolution

Supporting actions

Linked tests

  • As part of intent, may declare linking current test to a specific subsequent test
  • Must narrate how the two tasks are related
    • Narration subject to group consensus
  • Modify subsequent test based on result of this one
    • critical success: +2
    • success: +1
    • failure: –2
    • critical failure: –4
  • Limit 1 linked test each
    • Encourage multiple linked tests in series to describe a progression of events


  • Other character can use their skill to assist your test
  • Not a separate intent or test, merely a bonus from direct assistance
  • Must narrate how other character’s skill use assists this test
    • Narration subject to group consensus
  • Modify test based on skill level of assisting skill
    • skill level ≤9: no bonus
    • skill level 10–15: +1
    • skill level ≥16: +2
  • Limit 1 helping skill per character per test

Related expertise

  • Use a knowledge-only skill to help with current test
    • Area Knowledge, Connoisseur, Current Affairs, Expert Skill, or Hobby Skill
  • Must narrate how the knowledge assists this test
    • Narration subject to group consensus
  • Modify test based on skill level of assisting skill (as for “help”, above)
  • Limit 1 related expertise per test



  • Adult Role Playing

    Letting the players take control is a must for any fully detailed world.
    As for limiting rolls, this doesn’t seem to address the source of much of the problem when dealing with gaming systems and rolling dice – lots of powers and options to consider, multiplied by lots of combatants. Consider 7th Sea and its brute squads, for example – groups are treated as a single, functional character. It works quite well.
    Another alternative, especially in high-powered games, is to consider mobs of hostile, individually ineffectual characters to simply be a hostile environment.

    • tbone

      True, limiting dice rolls is just one small simplification, whereas games often have many time-consuming complexities. Combining fewer dice rolls with other combat simplifications like you mention, though, can make for a nice streamlined game.

  • Adult Role Playing

    Letting the players make their own choices is necessary. Assuming you can DM on the fly rather than a bunch of pre-planning. Limiting rolls is a good first step for many options buuuuuuuuut, large numbers of characters are generally a problem in any combat system. I’m with the other guy, use them as a hostile environment or pool them into a single ‘swarm character’ with high-powered stats to match.

    • tbone

      I remember some old RPG sessions that started out using regular rules to let super-powerful PCs wade into armies of foes, and start taking them down… and more the next round… and the next… again and again… It got so repetitive that the GM just started hand-waving the actual rules, and decreeing that the PCs took down X enemies per round. And after some time of that, finally, it just devolved into “Okay, you wipe out the rest of them.” Done.

      It might sound a wee scandalous to by-the-rules GMs, but it was good for keeping the story going (in a not-too-serious cinematic game), and good from a fictional story-telling point of view, too. That’s how a good book or movie would handle such a mass fight as well: Start with some detailed scenes highlighting the actions and capabilities of all involved, and as soon as that starts dragging, condense the rest and get on with the conclusion!

    • tbone

      I tend to like simulationist – I guess you could call that “restrictive” – rules for combat and other physical feats. But as guidelines for the bigger picture, for keeping the broad story moving and keeping players engaged, I think MERC is a good set of guidelines.

  • tbone

    This is a reply to Radoslav’s comment in another thread; I’m moving the discussion here where it fits better.

    Although I haven’t played Burning Wheel, I’ve talked about it with gamers, and am familiar with the “boon” type of reward for good roleplaying or other actions that make the game more fun. I call them “hero points” in the generic, non-game specific sense. As I’ve seen in various game systems, they generally let players modify task success (i.e., take bonuses on a roll), or in some games, even change determined results or otherwise dictate game happenings.

    I think hero points are a great mechanic, and definitely plan to use them more in the future. In particular, as Radoslav notes, they’re arguably a more fun reward for good roleplaying than are character points; they offer something that can be used here and now to make fun things happen in the game, rather than something that’ll be used later in a post-game bit of character updating. More and more, I like the idea of predictable, steady character point advances that are equal for all players, mixed with much more varied and freely-awarded hero point awards that may differ greatly by player. It’s fun to give out awards, and points that are made to be quickly consumed don’t carry the downside of character inflation! (Likewise, it avoids the hard feelings that can happen among players when the permanent stuff – character points – is distributed unevenly.)

    Somewhere I have a good list, cobbled from many sources, of possible ways a game can allow hero points to be used. Will have to find that and post.

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