The question "Is Othello a solved game?" touches on one of the most fascinating aspects of game theory and artificial intelligence. In 2023, Othello was weakly solved—proven to be a draw with perfect play, joining games like checkers and tic-tac-toe. This breakthrough reveals much about the game's complexity and the remarkable progress of computational game theory.
What Does "Solved" Mean?
A game is considered "solved" when we can determine the perfect outcome from any position, assuming perfect play from both players. There are different levels of solving:
- Ultra-weakly solved: We know the outcome (win/draw/loss) from the starting position but the winning strategy is not known.
- Weakly solved: We can determine the outcome from any position, but don't necessarily know the optimal moves from every position. This is where Othello sits—proven to be a draw with perfect play.
- Strongly solved: We know the optimal move from every possible position
Checkers was weakly solved in 2007, and Othello joined this category in 2023—both are draws with perfect play. Chess and Go remain unsolved, though AI has reached superhuman levels in both games.
Othello's Complexity
Othello presents a unique challenge. The game has approximately 10^28 possible positions—far fewer than chess (10^43) or Go (10^170), but still astronomically large. What makes Othello particularly interesting is:
- The branching factor varies dramatically throughout the game
- Early positions have many possible moves, making brute-force solving impractical
- The game's reversibility (discs can flip back) adds strategic depth
- Perfect play requires understanding mobility, stability, and parity
The 2023 Breakthrough: Othello is Weakly Solved
In 2023, a major breakthrough occurred: Othello was weakly solved. Researchers led by Hiroki Takizawa proved that with perfect play from both players, the game ends in a draw. This was a significant achievement in computational game theory.
The solving process required:
- Advanced algorithms and computational techniques
- Massive computational resources to explore the game tree
- Sophisticated position evaluation and transposition table management
- Years of research and development
This proof means we now know with mathematical certainty that perfect play leads to a draw. However, Othello remains only weakly solved—we know the outcome from the starting position, but not necessarily the optimal moves from every possible position (which would be strongly solved).
The Current State: AI Dominance
While Othello hasn't been strongly solved, AI programs have reached levels that effectively make the game "solved" from a practical standpoint:
- WZebra and Logistello were early champions, defeating world champions in the 1990s
- Modern engines like Edax and NTest play at superhuman levels
- These programs can solve endgame positions perfectly and play near-perfectly in midgame
- Against human players, top Othello AI programs win essentially 100% of games
The best human players can't compete with modern Othello engines, similar to how chess grandmasters can't beat Stockfish or AlphaZero.
Why It Matters for Human Players
Even though Othello has been weakly solved (proven to be a draw with perfect play), the game remains deeply engaging for humans because:
- Perfect play is beyond human calculation—there's always room to improve
- The game rewards pattern recognition, strategic thinking, and intuition
- Human vs. human games remain unpredictable and exciting
- Learning Othello develops valuable cognitive skills
Just as chess remains popular despite AI dominance, Othello continues to thrive as a competitive and recreational game.
The Future: Strong Solving?
Could Othello be strongly solved in the future? Possibly, but it would require:
- Even more massive computational resources and storage
- Breakthroughs in game-solving algorithms
- Years or decades of computation time
- Efficient handling of the game's vast position space
It's worth noting that computers can already strongly solve late-game positions in real-time. Once an Othello board reaches about 24–30 empty squares remaining, modern engines can calculate the optimal move from every possible position in that endgame phase. This late-game solving capability is used during actual matches, allowing AI programs to play perfectly in the final stages of the game.
However, the practical value of strong solving the entire game is limited. We already know the outcome with perfect play (a draw), and modern AI programs play at superhuman levels. Strongly solving the game from the start wouldn't change how humans play or enjoy Othello—the journey of improvement and strategic depth remain just as compelling.
Conclusion
Is Othello a solved game? Yes and no—Othello has only been weakly solved. In 2023, researchers proved that with perfect play from both sides, the game ends in a draw. However it hasn't been strongly solved (we don't know optimal moves from every possible position).
The beauty of Othello lies not in whether it's solved, but in the journey of improvement, the strategic depth, and the joy of playing. Whether you're a beginner learning the basics or an expert pushing toward 2000+ ELO, the game offers endless opportunities for growth and enjoyment.
Key Takeaway
Othello has been weakly solved—proven to be a draw with perfect play. While it hasn't been strongly solved (optimal moves from every position), this mathematical proof doesn't diminish the game's value. It remains deeply engaging and rewarding for human players at all skill levels.
