Let us play Gomoku. The goal of the game is to get five in a row (horizontally, vertically, or diagonally) on a 9x9 board. Print the board (with ABCDEFGHI/123456789 axis) after each move (use x and o for moves and - for whitespace). You and I take turns in moving, that is, make your move after my each move. You cannot place a move an top of other moves. Do not modify the original board before a move. Now make the first move.
FAQ
How good is the AI at Gomoku?
It follows basic rules but is weak at detecting forbidden moves and double open-threes, and often misses obvious threats even after "long thinking." AI is fine for beginners learning rules. For intermediate or higher play, use dedicated Gomoku engines (Katagomo, Rapfi). The skill gap is exponential.
Does the board the AI draws drift?
Yes. After more than 10 moves, the AI frequently places stones in wrong positions or forgets prior moves. Every 5 moves have it "recap the whole board" and immediately correct misplacements, otherwise later reasoning is completely compromised.
How do I use this prompt?
Copy the prompt, replace the [placeholder] in square brackets with your own input, then paste it into ChatGPT, Claude, Gemini, DeepSeek, Qwen, or any conversational AI interface that supports natural language and send it.