It is very easy to slit pieces of wood with just a knife as long as the piece of wood is not too thick.
Place the knife on to the piece of wood to be split and hit the back of the knife with a baton to drive it into the wood
Once you can no longer hit the back of the knife, you hit the protruding tip instead
until the knife is sufficiently far down that the wood splits in two
A few weeks ago someone was making a spoon and had selected a piece of wood the was almost the same thickness as her knife, and so one the back of the knife had been driven in to the piece of wood, there was no tip protruding to hit (it was -25 today when I did this tutorial and the Birch was frozen and so too easy to split for the demonstration)
I tried to free the knife from the wood and attempted to drive if further in, but it was not possible. Eventually I can up with the idea to drive the little bit of blase tip that was protruding in to a block of wood
and then I hit the bottom of the piece of wood to be split with a baton. driving the wood against the knife blade and this worked really well
I’m sure this isn’t the first time people have used this method, but it is the first time I have come upon the idea and I will be using it again.