The answer to this clever little riddle is surprisingly simple: the fifth sister is playing chess with Kate! The trick lies in recognizing that chess is traditionally played between two opponents. While the question tells us that Ann is reading, Margaret is cooking, and Marie is doing laundry, it also mentions that Kate is playing chess. In the intended solution, the unnamed fifth sister is the person sitting across from Kate, participating in the same game. There’s no need to invent another activity because the answer is already suggested by the information provided.

What makes this riddle entertaining is the way it directs our attention toward the four named sisters. As we read, our minds naturally create a list of separate activities. Reading, cooking, playing chess, and doing laundry all seem like individual tasks. Because of this, we may automatically assume the fifth sister must be doing something completely different. But the puzzle encourages us to reconsider that assumption. Two people can participate in the same activity, and recognizing that possibility is the key to the intended answer.

Of course, there’s a small technical detail worth mentioning. Chess can also be played against a computer or through an online platform, so the fifth sister isn’t the only possible opponent in every real-world situation. However, traditional riddles usually rely on familiar assumptions, and this one expects us to imagine an ordinary face-to-face game between two people. Once we understand that convention, the solution becomes clear. The challenge is less about complicated mathematics or extraordinary intelligence and more about paying attention to the relationship between the clues.

These kinds of brain teasers have entertained families for generations. They’re perfect for sharing around the dinner table, asking friends during a gathering, or challenging grandchildren to think creatively. The best part is that everyone can participate, regardless of age. Sometimes children recognize the intended answer immediately because they don’t overcomplicate the question, while adults spend several minutes searching for a more difficult explanation. And that’s what makes riddles like this so enjoyable: they remind us that a fresh perspective can be more useful than endless overthinking.

🧠 The intended answer: The fifth sister is playing chess with Kate!

❤️ Did you figure it out before seeing the answer?

A — Yes, immediately!

B — It took me a little while.

C — I guessed something completely different!