Forum:Special Summon types

Hi,

I have a question to special summon types. It seems there are different types but on the cards it always says "special summon". So I am confused when what special summon occurs. For example: Player A special summons "Blaster, Dragon Ruler of infernos". I got Steelswarm Roach on the field with 2 attachements. Now I expect to use the effect to negate that special summon. But it doesnt work. My opponent told me it is a Dragon Ruler and therefore its special summon cannot be countered. Yea, what? :-) Next move, he gets a XYZ Card Mecha Phantom Beast Dracossack. Which again I couldnt counter with my Steelswarm Roach even so I have 1 attachement left. I always thought XYZ summons are considered special summons. I am confused here aswell.

So my question now: When is a special summon not considered a special summon? And when can for example my Steelswarm counter a special summon?

Thanks Chris