This classic logic riddle says two people each play five games of chess, and both people win all five games. At first, that sounds impossible. If they were playing against each other, one person’s win would have to be the other person’s loss.
The answer is: they were not playing against each other.
Each person could have played five different opponents and won every game. The puzzle never says the two people played one another.
The trick is the assumption most readers make automatically. Because the sentence mentions two people and chess, it is easy to picture them sitting across from each other. But the wording only says each person played five games.
Once you remove that assumption, there is no contradiction at all. Both players can easily finish with five wins if their games were against different opponents.
