PhD student, Inria MOCQUA
For readers familiar with quantum circuits:
Match the target chain, keeping the numbered vertices in place.
Click a vertex to complement its neighbourhood: add each missing edge between its neighbours and remove each existing one. Edges touching the chosen vertex stay unchanged.
Each local complementation counts as one shot. Fewer shots rank higher.
Undo reverses the last operation. Ctrl/Cmd+Z also works.
Advanced: click an edge to pivot. Complement its lower-numbered endpoint, its other endpoint, then the first again. A pivot costs 3 shots.
Graph states and local Clifford operations
Practice completed.