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Gomoku lessons · Intermediate · Step 6
Double Four (4-4)
Make two fours with one move and your opponent can only block one of them. It's an even surer winning formula than the 4-3. (In real games, a 4-4 is a forbidden move for Black. It's allowed here so you can learn the shape. You still need to know it, because you have to stop White's 4-4.)
Puzzle 1
Where can you make two fours at once? (Black to move)
Show answer and explanation
The green circle marks the answer. Fours appear horizontally and vertically at the same time. Even though each is blocked on one side, there are two spots to block, so White can't stop both.