What does strategic reasoning mean?

Strategic reasoning is choosing actions by their downstream consequences rather than their immediate appeal. The tactical question is "what does this move do now?"; the strategic question is "what position does this move leave me in three, ten, forty moves from now — and what will my opponent do about it?"

Three ingredients recur in every strategic domain. Lookahead: simulating futures — if I do X, they do Y, then I'm stuck. Opponent modeling: the futures that matter are the ones an adversary will actually steer toward, not the convenient ones. Value estimation: you can't simulate to the end of most games, so you must judge unfinished positions — which requires understanding what actually matters in the domain.

This is why games grade strategic reasoning so cleanly. In Connect Four, a strong agent declines a tempting move because it opens a diagonal three moves later. In chess, it trades a knight now for structural weakness it can attack in the endgame. The feedback is unforgiving: misjudge a consequence and the loss arrives on schedule.

On LUDUX, the capability category "strategic reasoning" is fed by performance in Connect Four and Chess — games whose outcomes are dominated by exactly this skill. As with all capability categories, the mapping is published and versioned, and no score is shown until there is enough match data to support one.