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Intercept rules

Posted in Boardgames, Intercept, Rules, Vector movement on April 2, 2010 by Mr Backman

I finally gotten around to posting my homebrew spacecombat system Intercept. I have been a Traveller gamemaster since around 1980 or so and as my campaigns always have player owned ships there has been quite a lot of space battles. Originally we used the boardgame Mayday for space combat but when the High Guard rules came out we switched to that, mostly for its more detailed ship design system. When GDW released Striker, a wonderful miniature ground combat system with a highly detailed design system for tanks etc, I decided to do my own design system with more depth than High Guard, more along the lines of Striker. High guard based their designs on dTons and Energy Points and but my design system would be built around cubic metres, metric tons, Megawatts and SI units, similar to Striker. I had my own tech progression and added semi-realistic fusion thrusters, semi-realistic sensors, stealth, hydroponic lifesupport, got rid of the silly plasma and fusion weaponry (these may work in an atmosphere but sure as hell not in space) etc etc. It grew over the years to incorporate aircraft, cars, robots, helicopters, submarines, motorbikes, missiles, grav belts etc and eventually became unwieldy, buggy and really hard to maintain.

In 2009 I started fiddling with a new system from scratch, new rules and new design system specifically made to be simpler to use and easier to play (my daughters use it in our Traveller campaign, aged 11 and 15, so it cannot be that hard to use). That is what Intercept 3 is, a space combat system with some simple design rules for spaceships. I may eventually publish the design system in some form, Excel or text or both, but at the moment I will only have ready-made ships and some simple rules for converting whatever ship designs from whatever rules version you have, Traveller or other, into stats for Intercept. There is a table with weapons for small ships that can be used as guides for conversion from existing designs.

Intercept

The rulebook, maps, datacard and the optional transparency are available as pdf files for download. Start out small with one ship each, maybe skipping the Sensor rules out the first times if you are unfamiliar with vector movement. There are no counters in the game as the ships are plotted directly on the map (just print more mapsheets as you need them).

Intercept 3.0 space combat is the main rulebook for the game. The last four pages contain reference tables and should be printed separately and given out to each player. They are organised so they can be printed double-sided as you will never need the information on opposite of a page at the same time.

DataCard is used to fill in gameplay values for your ship, two ships fit on each paper.

Maptemplate is the map used both for the double-blind sensor rules and the actual action when Spotted ship duke it out. Print one for each player and one for the actual combat.

TransparencyTemplate is not strictly needed but helps when plotting sensor scans or determining whether your ship is inside a scan or not. It should be printed on OH film so you can see the map beneath.

You can get the whole shebang including the design system from here.

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The emptiness of space

Posted in Boardgames, Computer games, Films and TV, Science, Science fiction, Uncategorized on April 2, 2010 by Mr Backman

The Atomic rocket website deal with realistic space flight and combat in the most exhaustive manner possible. You can get tons of information on just about everything dealing with realistic spaceflight there and I consider it the best website on the net! There are however some assumptions they make which lead to the conclusion that space battles will have no ambushes, no role for stealth or sensors and little tactical decisions. The assumption is that space is empty and any approaching ship will be detected well before it come in harm’s way. There is no preferred direction in deep space so a space battles involving two ships could just as well be fought in one dimension, range only.

In air to air combat the two horizontal dimensions work the same but the vertical dimension works differently: The highest planes can dive for speed, lower planes run the risk of hitting the ground. As air pressure diminish with altitude each plane has ceilings above which they can no longer fly. Ship to ship combat in the age of sail had the weather gauge which gave the upwind ship advantages over the downwind ones and if the ships were close to shore there was also the consideration of how deep water each ship required to avoid running aground.

But space IS empty and equal in all directions so space battles WILL be predictable and leave no room for maneuver you may say, or you could grow pointy ears and say that space is filled with nebulae, dense asteroid fields, mysterious energy fields etc which give ample opportunity for ambushes, stealth and tactical maneuvering. I believe that we don’t need to go all Space Fantasy to have interesting space battles if we only change the our assumptions a little about where the battles take place.

In Traveller, the rpg I originally wrote Intercept for, ships use jump drives to travel between planets, you fly 100 planetary diameters away, jump to the next starsystem and fly the 100 planetary diameters to land or orbit. All space battles would take place near a planet or gas giant, more rarely near single asteroids or comets. Planets are huge, even as space combat ranges go and gas giants are even larger. If a ship is on the other side of a planet you have no way of knowing how it changes its vector, regardless of the amount of heat and light from its drive. When two ships moves so they have line of sight which each other again the ship that shoots first will certainly hit the other and probably take it out. The commander that is better at outguessing his opponent will spot him first and can get off the first shot, simply because surveying the sky takes time so where you start scanning is crucial. Ships in planetary shadow will be as dark as space itself and only visible on infrared. Ships near the direction of the Sun will be harder to spot, their weak signature drowning in the huge outpouring from the sun. The excellent Rocketpunk Manifesto website has an interesting article that also question the assumption that space battles will and should be fought in deep space.

All this allow us to make somewhat realistic space battles where ambushes are possible, maneuvering matter and sensors vs stealth plays a part, only if we assume that battles will take place near planets instead of in deep space. When we design space combat board games, computer games, books etc we should take planets, sun direction etc into account to make space battles more realistic while keeping the fun. Star Trek and other space fantasies are cop-outs, and there is no excuse to go there for whatever reason.

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The vector on the map or not?

Posted in Other vector movemet systems on March 29, 2010 by Mr Backman

You want to display the ships current position and perhaps in what direction it is facing, you also need to display the speed and direction of the ship. The basic system of having a past, a present and a future marker to depict the position, vector and acceleration is in my opinion the most elegant as it puts so much information on the gameboard. The GDW boardgames Mayday and Battlerider used this system but there other ways of depicting the vectors.

You can have one piece showing the position and facing of your ship and use other means for depicting its velocity (or vector). In grid based systems such as the tactical space combat in Battlefleet Mars you used three numbered chits to depict vector length, one for each of the three dimensions. In Brilliant lances they used a 12 point system for facing (you were either facing a hexside or a hexedge) and two counters on your status display for the direction and length of the vector. The system hardest to grasp of all vector system I’ve tried is the one used in Attack vector: All other vector systems I am aware of depict one unit of thrust as one unit of speed added, ie if you thrust one unit you move one unit and add one unit of speed. This is a simplification as the ship is thrusting during the entire turn so one unit of thrust would add one to speed but only one half to position. Attack vector does this correctly and they also consider the fact that a turning ship that thrusts will spread out the thrust from the starting direction to the ending direction. These effects are real and by taking them into account one could argue that Attack Vector is the most realistic vector movement boardgame there is. There are however other aspects of space combat that I think Attack Vector fails in namely the fact that ship commanders should know how to fly their ships and what their enemies are capable of. Playing several games of Attack vector we all felt like drunken monkeys trying to steer our ship by guesswork alone. As the game offers no features of the mapboard itself such as planetary shadows, sun directions, whiteouts from nuclear explosions etc the entire game boils down to understanding how ships move.

If the vectors aren’t displayed on the mapboard you must rely on looking at the counters and doing some head math to predict where your enemy is going, the gameplay becomes guessing how the enemy ships moves. In my opinion you should put as much information unto the map itself as possible to help with the gameplay. Why do we have mapboards at all? Showing the ships position on the map helps the players decide how to maneuver but in vector movement one could argue that the vector information is even more important to show on the map. We could have games where ship position, ship orientation and ship vector were all tracked on a status board with no map at all. We would no longer need to bother mapboard edges etc but everyone would agree that the game would be really hard to play. If we track position on the board we should track vectors there too as we want the players to win by tactical choices rather then knowledge of the rules.

Put the vector information back on the mapboard and let the players concentrate on playing the game!

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Hello world!

Posted in Vector movement on March 23, 2010 by Mr Backman

Well, this is my very first post for vectormovement.wordpress.com. This blog will try to deal with everything related to vector movement but first and foremost to my paper and pencil space combat system called Intercept (and yes, of course it uses vector movement). Vector movement in games has been with us a long time and my contact with it dates back to the early 1970s when I was taught car racing on graph paper by a teacher. For those who have not heard about vector movement or doesn’t quite grasp the subject let me explain it a little:

Vector movement is a way to simulate, in games and elsewhere, how objects move when they are subject to Newtonian movement and as long as we stay well below the speed of light that is true of everything, you, me, our planet and all real world space craft. The reason we lack an intuitive grasp of vector movement is because real world objects are subject to air friction, rolling resistance, muscular resistance etc as all these hide the underlying mechanisms of vector movement. Hovercraft and Curling stones have reduced ground friction to a degree where the Newtonian nature of their movement is clearly visible. Spacecraft, moving in the stark vacuum of space are subject to even less drag, so little as in fact that the Voyager probes sent out in 1977 are still travelling at about the same speed except for the speed loss caused by ‘climbing uphill’ in the gravity well of our Sun.

Doing vector movement in a game goes something like this (not all games do it this way, notably the Attack Vector boardgame)

  1. Measure the speed and direction of you last move
  2. Apply it again as your future drift position.
  3. Apply acceleration from the drift position to get your true future position.
  4. The speed and direction (together we call speed and direction a ‘vector’) is your new move.

Yes, vector movement is this simple and you can do car races or space fights with just pencils and graph paper.

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