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Gomoku lessons · Basics · Step 2
Blocking a Four
When your opponent makes a four, you must block it right away — otherwise you lose on the next move. But if you can win first, winning comes before blocking!
Puzzle 1
White has made a four. Where should you block? (Black to move)
Show answer and explanation
The green circle marks the answer. Black has already blocked one end, so just block the other end.
Puzzle 2
Look closely at the vertical line. Where do you block? (Black to move)
Show answer and explanation
The green circle marks the answer. For a broken four, the empty spot in the middle is the vital point. If you block an end, White can still fill the middle and make five.