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Gomoku lessons · Basics · Step 4
Making an Open Four
A four with both ends empty is called an "open four." Even if your opponent blocks one end, you make five at the other, so it's practically a win. Grow your open threes into open fours.
Puzzle 1
Turn Black's open three into an open four! (Black to move)
Show answer and explanation
The green circle marks the answer. Adding one stone at the end makes a four with both ends open. White can only block one side.
Puzzle 2
How do you turn a broken three into an open four? (Black to move)
Show answer and explanation
The green circle marks the answer. Filling the middle connects four stones (●●●●) with both ends open — an open four.