Connect6: two stones a turn六子棋の考え方

Count threats in twos

• You place two stones, so you can block two things or make two things. An opponent's shape that needs three blocks is unblockable.
• Four in a row with both ends open needs two stones to block: the opponent has exactly two. Four with both ends open plus any other threat wins.
• Five in a row with one open end is a single threat. Do not panic at it; one stone blocks it and the other is free.

Shape

Because you place pairs, connected shapes matter more than in gomoku. Two stones with a gap between them are a potential four in two moves; keep your stones near each other and force the opponent to spend both stones on defence each turn.