The open four
An open four has two winning points, so it can’t be stopped. Learn to make one from an open three your opponent missed. Threats · lesson 2 of 4.
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The lesson in words
Ivory didn’t block your open three. Now you can make an open four: four in a row with both ends empty.
Ivory can block one end, but you make five at the other.
Your three is open at both ends.
Try it: Make an open four.
An unblocked open three becomes an open four, and an open four wins.