Assuming a Sensor Net Anti-Missile Missiles (AM Missiles) may be deployed whenever missiles are detected within a range of 1 million miles (100 hexes). From a game mechanics point of view an AM Missile which passes withing the same hex as an attack missile is an automatic kill, unless penetration aids are being used. In the case of an active Jammer there is a one in six chance of a missile hitting an actual missile as opposed to a false or spoofed missile. The GM records a number. If the attacker rolls that number it is a hit. If not a miss.
When jamming is used with a large number of missiles it becomes purely a numbers game. Determine the number of attacking missiles and subtract the number of anti-missile missiles to determine the number of missile which survive. At space combat ranges it is beyond the ability of sensors to determine the actual number of attacking missiles so for the defender it is a game of probabilities. If the defender launches too few AM Missiles attack missiles will get through to their targets. If the defender launches too many AM Missiles the excess missiles will be wasted and might be needed for subsequent attacks.
If penetration aids are used six times as many anti-missile missiles must be launched to stop every missile.
So if an attacker launches 300 missiles and the defender launches 200 AM Missiles, 100 missiles will survive to face the defender's point defense. If the attacker has used penetration aids then only 200/6 missiles (33.3, round up to 34) missiles will be destroyed and 266 missiles will survive to face the defender's point defense.
In the space combat round any missile within 10 hexes (100,000 miles) will be destroyed within the launching turn of the anti-missile missiles. Missiles within 40 hexes (400,000 miles) will be destroyed the turn after AM Missiles are launched. Missiles at 100 hexes (1,000,000) will be destroyed two turns after the AM Missiles are launched. Of course anti-missile missile ranges may be extended by launching them from a heavy missile booster package. In that case the 500mm missile may travel to it full range before deploying it's 10 Viper anti-missile missiles. The Vipers accumulate the heavy missile acceleration as well as their own. Some ship launch Vipers from gravity pulse launchers which will give an extra 1000 Gs of initial acceleration. This really has little effect on game play because of the 10,000 mile hexes used. Difference in range and velocity are lost in the noise.
500mm attack missiles accelerate by one hex every turn. 250mm attack missiles accelerate by one hex every other turn. Missile with laser communicators may be commanded to move at any acceleration up to their maximum acceleration each turn. They may also be made to hold station, creating an kind of space mine which can then attack as the result of a remote trigger from a ship or station.
Any missile which survives will face the defender's point defense. Point defense consists of X-Ray Lasers and railguns firing canister shot. X-Ray Lasers are one-shot/one-kill weapons. In the anti-missile roll they are operated at reduced power and a higher rate of fire. Each laser will kill one missile per turn. For example a quad turret can kill 4 missile per turn. As for anti-missile missiles take the number of attacking missiles and subtract the number of point defense lasers to determine if any missiles survive. Canister shot is an area effect weapon capable of destroying multiple missiles. This is because the range is so short because kinetic kill missiles and contact nukes must converge on the target in order to damage it. Any missiles which do not employ a "pop-up" trajectory will be damaged by canister fire.
X-Ray laser warheads detonate outside the range of point defense lasers and railguns. Such point defense weapons are ineffective against these weapons.
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