I use an angle grinder to flatten the pins flush to the link then punch them out, if you haven't got a proper punch use a nail make sure it's a masonry nail else it will bend, which i learned through experience and whacking my hand with a hammer
Now i know that sounds a bit of a bodge job way of splitting a chain but it works and it's what i have done to remove links for the past 3 or 4 chains I've owned
I can just imagine engineers and like technical minded chaps cringing at my non typical way of splitting chain links