Locate the starting point
Read the leader label before looking for the highest card. The order of play and the entered trump suit give the example its context. A card diagram with no labels can encourage a learner to answer a different question from the one being asked.
Explain one comparison at a time
Say which cards are candidates under the chosen conditions, then compare their ranks. Ask another learner to explain why an unrelated high card does not settle the example. Use the source to resolve uncertainty about the rule.
Keep the missing information visible
The interactive tool does not know what remains in any player’s hand. It cannot tell whether someone had another card they should have played. This makes it useful for winner comparison but insufficient for judging a disputed play.
Change one input
Try the preset examples, then change only the trump suit or the leader. Describe what changed before pressing Compare. Controlled changes help a learner connect the output to the input, rather than treating a result as something to memorise.