can a sword cut a man in hlaf?

is it possible for a sword to cut a skull in half and then makes it way through the rest of the body, until the whole body is slashed in half.

People need to stop thinking katanas are some magical weapons capable of amazing feats. European blades are just as capable of the things the Japanese weapons are. It just depends on the wielder.
There was an excavation at the site of the battle of Wisby (ca 1361) that the remains of the warriors were examined and the evidence of wounds were cataloged. There was a remarkable amount of arm and leg amputations! If a European sword can cut through a leg (probably covered in armor too) It could certainly go through the neck (think of medieval executions), but bone is not meant to be cut and therefore could not cut through the skull. The bone will just collapse before that is possible. I also dont see it ever being possible (with any type of sword) that it could cut through a body in one cut. Multiple cuts yes. There is just too much in there to prevent a clean slice. You've got all the guts and of course the spine to deal with. Go too low and you have the pelvis, go too high you have to deal with the ribcage. Even if you miss the skeleton the mass of the human body will slow the attack down too much to make a one cutting strike possible.

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