Except that incorrect moves don't imply an incorrect representation. The internal representation was a literal 8x8 grid of piece locations they could externall

Except that incorrect moves don't imply an incorrect representation. The internal representation was a literal 8x8 grid of piece locations they could externally change and have it generate moves consistent with the changed position. It's about the clearest example of a learned higher-level internal representation I can think I've seen. The fact that it didn't also perfectly learn the rules while it was doing that is entirely uninteresting.