head to head
Street Fighter II' Turbo asks more than Nidhogg, and the gap is optimization.

Reads · Competitive PvP
Minimalist fencing duel that is almost entirely about out-guessing one human.

Execution · Competitive PvP
The foundational test of fighting-game execution and human prediction at speed.
Nidhogg leans Reads (Competitive PvP); Street Fighter II' Turbo leans Execution (Competitive PvP).
Street Fighter II' Turbo leans a little harder on execution, though the gap is small.
Nidhogg
Sword-height changes and dive-kicks need quick hands
Street Fighter II' Turbo
Charge timing and anti-air reactions at turbo speed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Nidhogg
Pure human duels of feints and conditioning
Street Fighter II' Turbo
Fireball-trap mind games against an adapting human are the essence
Nidhogg leans a little harder on variance, though the gap is small.
Nidhogg
Symmetric deterministic arenas
Street Fighter II' Turbo
Twelve public movesets, nothing hidden
Street Fighter II' Turbo leans clearly harder on optimization.
Nidhogg
Small toolkit, little to solve beyond fundamentals
Street Fighter II' Turbo
Matchup theory and spacing fundamentals were codified here
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.