I am adding a small pantry with door to the kitchen area and want to continue the hardwood floors from the kitchen area into the pantry. After removing the baseboard moldings I see that the last hardwood board against the wall was roughly ripped to fit. I want to cut out a portion of this board where the door opening will be, so that I can continue the flooring into the pantry. Can I cross-cut this board without having to remove the entire board first? There is not enough room to plunge cut with a circular saw - would it be better to just use a chisel?
Added drawing to show what I'm trying to do. The boards against the wall have been ripped down to only about 1" wide, so there's not much to cut...