Hand reading is not guessing the opponent's exact two cards — it's range narrowing. You start from the range their position announced (Topics 2 and 6), and every action they take strikes combos from it. By the river you aren't asking "what do they have?" but "how much of what's left do I beat?"

The discipline is the same on every street, three questions each time: what does this action keep (a call keeps hands with enough to continue)? what does it cap (a check or call typically rules out the strongest holdings — they'd have raised)? and what do the board cards block (Topic 13: a visible ace means fewer ace combos in anyone's range)? Ask them in order, every street, and the range shrinks on its own.

Put it to work on the river: the final range is small enough to count. Pot odds (Topic 4) tell you the equity a call needs; the narrowed range tells you the equity you actually have — the decision is arithmetic, and Topic 5's defense math polices the other side of it. Players who feel lost on rivers are typically lost because they skipped the counting on the earlier streets.

This narrowing walk is the same estimated-range walk the grading page describes — the skill this lesson teaches is literally the one the app grades you against. One honest caveat: the app's walk assumes reasonable, neutral ranges. Real opponents deviate, and reads about how they deviate are where the Exploiting-a-known-read page picks up.