Game Mechani(sm) of the Week #10: Hit Locations

To depart from the Quincunx work that I'm currently pursuing, here's a completely different game mechanism.

I've found that a lot of people enjoy the concept of combat in games, but different people view the essence of physical conflict in different ways.

Some prefer an abstract series of die rolls, some like tactically placing their hits on their target's vulnerable areas; some want the die rolling to be fast, while others love an exceptional level of detail.

Without plugging the numbers into a computer program and letting it do rapid calculations, there is no real way to get good crunchy detail while also having the game progress at an action packed pace.

Either you get the adrenaline pumping with quick descriptions and abstract detail, or you really get into the minutiae of injuries and slow the combat down to "matrix-style" bullet-time.

Plenty of games try to find a balance between the extremes, some more successfully than others. I know of a few games that somehow manage to slow things right down to a crawl, but still give you little more than abstract detail as a result (Yes, White Wolf, I'm looking at you).

Like a lot of things simulated in RPGs, combat can be viewed in a manner that is either task based or resolution based.

Do you want to know specifically how something is done? (This tends to be the slow method)

Do you want to know the outcome once it's done? (This tends to be the fast method)

If you've ever been in a fight, you'll know that someone will try to hit you if you leave an opening, and you'll try to hit them if they leave an opening. Most boxing matches follow this pattern...as does fencing...and so do most other forms of fighting for that matter. You could set up for a strategic strike at a particular area, but if you're target realises that this is your aim, they'll just focus their defences on this area. Since they don't need to worry about defending other areas, that leaves them more able to expend their other energies in hitting you.

Sure there are people who'd argue against this analysis of combat, and they are free to generate their own systems of RPG physical conflict resolution. This combat mechanism reflects the notions I've described above.

Another thing that strikes me as odd about many combat systems in roleplaying games in the idea that you have a roll to hit someone followed by a second roll to see how much damage you do. One person could easily hit their opponent, only to do a minimum amount of damage; while another person could just manage to scrape against their opponent while doing huge damage. It doesn't make sense to me, and it slows things down. I like my combat rolls to cover both the hit and the damage in a single throw of the dice.

A single throw that shows how well the target has been hit and where the target left their opening. Beyond this point, the mechanisms for damage and prevention can follow a few paths that I'll offer.

Different games use different dice so I'll offer three options (d6, d10 and d20).

The d6 option is where I've picked up this mechanism, specifically from earlier versions of the miniatures battlegame Confrontation.

In this game, a hit roll consists of rolling 2 six sided dice. The high one determines damage, the low one determines hit location. You want both dice to roll well, because scoring a better hit locations factors into the final damage done to the victim. The distribution is basically as follows; 1 = Legs, 2 = Arms, 3 = Abdomen, 4 = Torso 5-6 = Head. Even though the head is hit on a 5 or 6, there is a remote chance of hitting it, because the low die has to roll this high (therefore meaning that both dice have to roll this high for a head hit to occur).

Final damage to a victim is calculated by taking the weapons strength, subtracting any armour value of the victim, then adding the high die result. This is compared to a chart to determine whether the victim has taken a light, medium or critical wound, or if they have been killed outright.

The die rolling is quick, and the system gives a nice outcome. Critical hit to the arm, light wound to the leg, medium wound to the abdomen...you get the idea. It gives a much better impression of the conflict than just saying "Lose 5 hit points". Sure it's not as detailed as the hundreds of tables in Rolemaster, but it doesn't take five minutes worth of die rolling and table lookups to perform a thre second swing.

Adapting the system to other dice sizes gives a better granularity of scale, without sacrificing the speed.

A d10 option could look like this; 1 = Lower Legs, 2 = Upper Legs, 3 = Weapon Arm, 4 = Defensive Arm, 5-6 = Abdomen, 7-8 = Torso, 9-10 = Head.

A d20 option could get really specific; 1 = Right Lower Leg, 2 = Left Lower Leg, 3 = Right Thigh, 4 = Left Thigh, 5 = Groin, 6 = Right Hand, 7 = Left Hand, 8 = Right Lower Arm, 9 = Left Lower Arm, 10 = Right Upper Arm/Shoulder, 11 = Left Upper Arm/Shoulder 12/13 = Belly, 14/15 = Torso, 16 = Neck, 17-18 = Head, 19-20 = Eyes specifically.

This level of detail allows for character to be protected by armour on specific parts of the body. Modifying the amount of damage that might be received from an attacker.

Different combat styles could also change the way numbers are assigned to the die. Certain combat styles might be more adept at hitting the central ass of the body, while others focus on disabling limbs.

Advanced combatants might be able to modify the low die up or down by a value of one or two, indicating that the combatant is more adept at placing their hits in vulnerable locations.

But the whole idea is that the strike takes only a single roll of dice to determine it's effects, and a single table reference to see what is actually done to the victim.

I've seen it work well in miniatures games, but so far haven't seen it work as well in a roleplaying game.

Comments

Zac in VA said…
Hey, there! I've been pondering the issue of wounds and damage in RPG design today, and I just posted about it at the Forge.
What you're talking about here reminds me of a thread about a fencing mechanic, one that had in-game currency for taking and losing the upper hand, and balanced defense and offense pretty elegantly, I think.
When you said, "someone will try to hit you if you leave an opening, and you'll try to hit them if they leave an opening," it made me think, "How often do you really, absolutely need to hit someone in a particular spot? What are you fighting, a cyclops?" Magical weak-points on bosses from the PS2 game Shadow of the Colossus also come to mind.

My goal in conflict resolution for Mask has been to use good rolls to indicate that somebody gains the upper hand in the struggle, rather than making every roll a chance to do damage.
Back in the day, '05 or so, I came up with the germ of this idea in my Twin Kingdoms RPG (awesome setting, but unfinished) - when two Skin-Changers (shape-shifters) fight, they tussle, wrestle, and fight to gain the upper hand, and when one of them has managed to pull ahead by 5 dice (the dice-pool margin of success takes that many dice away from the loser, so when 5 dice have been lost, here we are), then they have their opponent pinned and/or have an opportunity to harm them in some significant way.
This reminds me of the old D&D justification for hit points - in some forgotten paragraph in a rulebook somewhere, a TSR employee suggested that combat mechanics are an abstraction not only in terms of detail but time, as well. The idea unfolds a little further to suggest that each roll is not a swing of the sword, but actually the culmination of a series of parries, lunges, and blows, all to set up a chance to outmaneuver one's opponent enough to land a blow.
That concept somehow wormed its way into my subconscious, and now that's where I'm operating from in terms of damage rules.
[if this double-posts, I apologize - Blogger is being fussy]
Vulpinoid said…
That makes sense with the hit points, I can see it representing combat ability, having more points represents a better capacity to deflect damage...the only problem I then have with it is that hit points are then used to cover resistance to poisons, disease, magic, and anything else that could impact on a characters survival.

Something that began as a useful tool to reflect combat prowess gradually mutated into something that lost its original significance.

There are a few other combat (and conflict) mechanisms that I'd like to examine over the next couple of weeks.
Anonymous said…
Foot 1 2 2 3 3 4 4 5 5 6 6
Arm 2 3 3 4 4 5 5 6 6
Abd 3 4 4 5 5 6 6
Tors 4 5 5 6 6
Head 5 5 6
Vulpinoid said…
That's about right Chancetrinn, but I'd put it like this.

One die across the top and another die down the side.

X 1 2 3 4 5 6
1 L L L L L L
2 L A A A A A
3 L A B B B B
4 L A B T T T
5 L A B T H H
6 L A B T H H

L = Leg (11 in 36 chance)
A = Arm (9 in 36 chance)
B = Belly (Changed from abdomen in this example to avoid confusion, 7 in 36 chance)
T = Torso (5 in 36 chance)
H = Head (4 in 36 chance)

When calculating the actual damage done to someone, I'd increase it by a degree for each of the more difficult areas to hit. In a system where damage is determined by number of successes, then a basic hit would be scored if the damage was done to the legs, an extra success for an arm wound...three extra successes for a torso wound. You get the idea.
Micah said…
Thanks for this post, I've been trying to resolve Hit Location for some time now, and this is an elegant, simple solution. My only question is: Is there a simple way to incorporate a character's ability to increase or decrease the probability of success?
Vulpinoid said…
The system from which this is derived has a number of complications that I haven't included for the sake of brevity and avoiding confusion.

For example, there is an assassin ability which lets players roll three dice, then pick which two to use when checking for their high and low results.

Another ability allows players to reroll fives and sixes on the damage part of the roll (adding the new dice to the original result).

Certain characters may be familiar with the tactics of particular enemies, and they may automatically do an extra degree of success against that enemy.

Another ability could simply allow a character to shift their low die by a point either side, letting them have a better chance of targeting vulnerable areas.

If you're simply referring to one characters ability to hit another, then have the attacker roll a die, then add their ability score, and compare this to a standard difficulty based on the defender's skill (or use a defence skill + die). Once you've determined a successful hit, roll the next die for the attacker...once the two dice have been rolled compare the face values of the dice without skill values added in.

Hope that helps.
There are numerous ways to skin a cat. Comabt can be about attacking openings, but one has to consider that your opponent knows that opening is there and there fore will be able to protect it, hell they may well have left the opening there to draw you in to an attack it so they can counter, so maybe be you have to make then make another opening by attacking soemwhere else!
The idea of a linked damage location role is cool/easy but for interest needs to be linked to some kind of maneuver aspect, like Swashbuckler, TROS for example.
JW
I've been thinking about this a bit more. The problems I have always had with random hit location rolls is that you end up with strange hit locations, or you end up then having to add modifiers for people bring locations back to somewhere near a sensible "called" shot location.
Taking my inspiration from histroical teachings, one of ten finds the body divided into four openings/quarters. the player nominates the opening they are directing their attack at and then roll to for damage and location from there.
You have upper and lower then left and right.
Having called upper left my locations are then
1Head
2Neck
3Chest
4Shoulder
5Upper arm
6Elbow
7Lower arm
8Wrist
9Hand

Lower body
1belly
2groin/hip
3thigh
4knee
5lower leg
6ankle
7foot
This can add a tactical dicison to the equation, still keeps it relatively quick and random and keeps in line with "reality"
Best
JW
more thoughts. A more skillfull fighter could decide to use a lower value die, the higher skill level would have less variability in hit locations so instead of a d10 they could go down to a d4, as the most likely "killing" locations are lover on the number scores.
Also one could carry over the amount the the exchange was one by and use this to modify the location, if they want. So i win by two points i am able tomodify the target by up to two points.
Best
JW

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