📐 Tic-Tac-Toe 3x3 & Gomoku 15x15 Grids
Tic-Tac-Toe requires 3-in-a-row on a 3x3 grid. Gomoku (五子棋) requires 5-in-a-row horizontally, vertically, or diagonally on a 15x15 Go grid!
⭕ First Player Advantage
In both games, Player 1 (X or Black stone) holds initiative. In Gomoku, Black moves first on the center star point (K8).
🎯 5-in-a-Row Objective
Connecting 5 continuous stones wins Gomoku immediately!
🧩 Why Tic-Tac-Toe is Always a Draw
Click scenarios below to learn the optimal corner-opening defense!
Center Opening Strategy
Optimal First MoveTaking the center square gives Player 1 the maximum number of potential winning lines (4 lines)!
📜 Common Questions & Gomoku Rules
Is Tic-Tac-Toe mathematically solved as a guaranteed draw?
YES! Under Minimax algorithm evaluation, if both players play perfectly, Tic-Tac-Toe is 100% guaranteed to result in a Draw. Player 1 can force a draw or win if Player 2 makes a mistake.
What is an Open-Three (活三) vs Open-Four (活四) in Gomoku?
An **Open-Three (活三)** is a line of 3 stones with both ends open that can become an Open-Four on the next turn. An **Open-Four (活四)** is a line of 4 unblocked stones with open ends; it guarantees a win on the very next turn because the opponent can only block one end!
What is the 4-3 Double Threat Fork (四三叉)?
A **4-3 Fork** occurs when a single stone placement simultaneously creates an Open-Four (活四) AND an Open-Three (活三). The opponent is forced to block the Open-Four, leaving the Open-Three to convert into a winning 5-in-a-row!
How is Black's first-player advantage balanced in professional Gomoku (Renju)?
In professional Renju rules, Black is forbidden from forming Double-Three (3-3), Double-Four (4-4), or Overlines (6+ stones in a row). White has no restrictions!
⚡ Gomoku 4-3 Double Threat Forks
🔱 4-3 Double Threat Fork (四三叉)
Creating an Open-Four AND an Open-Three simultaneously in one move guarantees checkmate because the opponent cannot block both threats!