What the price-bound guard changes about the measured fill rate

This site's own explanation of the words above. The verdict itself is published exactly as the research index records it and is not rewritten here.

the touch

The best price sitting on the order book right now. It is not the same as the headline price the game shows, which is an average across the orders on that side.

price-bound artifact

A fill the simulation counted only because the recorded price range touched the order's price, with nothing else showing a trade actually happened. It is a measurement error, not a fill.

VOLUME_CONFIRMED

A stricter fill rule that also requires traded volume to back up the price move. Stricter did not turn out to mean more accurate: it was measured carrying a higher share of false fills than the generous rule at every depth tested.

touch_only

A deliberately generous rule for deciding an order filled: it counts a fill whenever the market price reached the order's price at all. Real fills are a subset of these, so a result measured this way is an upper bound on what could have happened, not an estimate of what did.