A routed board with every connection made and zero DRC errors added. The unit of score in autorouter-bench and PCBWorld.
How it looks
Real geometry: CORE3588 copper, drawn from our board file (2D plan view)
CORE3588 top copper, as Sam finished it: the real geometry, drawn from our board file. Its final check reported 0 unconnected items and 0 electrical, clearance, drill or skew errors (the only notices left are library footprint mismatches), so by our definition it is a clean board.
How it works
Where it fits
Counted by the benchmark referee; it is the unit of score in autorouter-bench and PCBWorld.
A clean board can still be a poor one (too many vias, a broken ground plane); that is the quality gap Ants is aiming at.