If A plays 3, either B includes 5 in their first move (by playing 1, 5 or 2, 5 or 5 alone), in which case A can win by playing 1, 4 or 2, 4; or B doesn’t include 5, in which case A plays 5 next ...

Can you solve the 9 dots 4 lines puzzle without lifting pencil? You have 20 seconds! Math Riddle Genius Test: 9 Dots 4 Lines Puzzle. It would have been really easy to connect all dots using 5 lines.

I made two crosses, one standing straight and the second laying 3/4. Reading the rules, it was correct too,” added another. “Now that's a true genius trick, thinking beyond everything.