18 out of 22. I made the spetum/partisan mistake as well, and mistook the awl pike for a regular pike, and made a stupid mistake with the glaive-fork.
That spetum/partisan thing is amusing, though, since it seems to be very common, but you need to possess some rather arcane knowledge to even be capable of making it.
Also, the guisarme/voulge/glaive family of polearms can be identified by logical deduction.