[Suicide Junkie]

I see that with active ECM, the jamming will rise at the same rate as the missile's sensors, ruining the missile's tracking system.
I currently think that passive ECM like decoys and stealth would me much easier to detect close up. Thus, effective ECM for ships would be in the active forms.

Despite any ECM;
I think CSMs could get the 100% accuracy without knowing where exactly the enemy ship is, by bLasting the entire tactical square.
Meanwhile, beams cut through only a tiny fraction of the square, and so have a decent chance of missing. Incinerator & Wave motion gun beams are really thick, so they get a big to-hit bonus since they cover more of the square as they go through.