Where is that total fool who was here a couple of months ago insisting that chains should be sized based on the small chainring small cog combo.
That might have been me. I've always sized chains this way, preferring to carry the longest chain that works.
But you have to follow the entire set of instructions, understanding that small/small is used to determine the
MAXIMUM chain length, and big/big the
MINIMUM.
Also, that the MINIMUM is the more critical consideration.