DISCUSSIONS on “Rules for online games in HoMM3 and formulas for calculating player rating.”

We're talking about the block near the castle. That is, you can't even leave, or you can only move a very short distance. And 60-70 Lizards on the first map are only killed in exceptional cases, with Mass Haste or Minor Constriction...

Or if you're Shakti...
And in general, if you really need to, you can upgrade to Bog Flies, or Pegasus for the Rampart. And so on. They can be defeated.
I agree about specifically indicating what constitutes a block and what doesn't (i.e., specific monsters and their numbers). However, there's also a nuance here: the army of three starting heroes varies greatly and can also affect whether you can break through, partially lose, or completely lose.