Fork Around and Find Out Part 3: Interpreting the knight auditor

SummaryThis is the third and final post in a series detailing our attempts to mechanistically interpret one head of the chess transformer Maia-3. We find that previous causal evidence gave us a spurious picture of the head, and that rather than just detecting knight forks, head 5 of layer 5 (l5h5) predominantly serves to suppress pointless knight moves.Maia-3 architecture from (arxiv.org/pdf/2605.19091)In this final post, we show that intentionally crafted probes shatter this interpretation of l...