China's Hard Court Table Tennis Puzzle: Why Zhang Jike and Fan Zhendong Don't Use the 'Unsolvable' Serve Every Time
A Zhihu question about why Chinese table tennis champions Zhang Jike and Fan Zhendong don't use the 'unbeatable' over-the-net serve (霸王拧) every time has gone viral, revealing a fascinating lesson about game theory.
The Question
- Zhihu trending: ~1M+ views
- Topic: Why not always use the 'unsolvable' technique?
- Players: Zhang Jike (Grand Slam champion), Fan Zhendong (former world #1)
The Answer: Game Theory
- predictability = vulnerability: If you always use one serve, opponents learn to read it
- Physical toll: The 'unbeatable' serve requires more energy per attempt
- Risk-reward: High-reward techniques also carry higher error rates
- Strategic variation: Mixed strategies dominate pure strategies in game theory
- Reading depth: Opponents adapt — today's 'unbeatable' becomes tomorrow's readable
Why This Matters Beyond Table Tennis
This is a pure Nash Equilibrium problem. In any competitive interaction, the optimal strategy is never to play the same move every time. You must randomize to remain unpredictable. This applies to: business strategy (never rely on one product), military tactics (never repeat the same maneuver), investing (never concentrate in one asset), and negotiation (never show the same pattern).
Analysis
The Zhihu discussion is trending because it's an accessible gateway to game theory. Zhang Jike's '霸王拧' (typhoon spin) is visually spectacular and statistically dominant — but using it exclusively would make it statistically average as opponents adapt. The mixed strategy equilibrium (varying serves in proportion to their expected value against an adapting opponent) is the mathematical answer to the question.
Fan Zhendong's recent retirement announcement adds poignancy: we're now analyzing the techniques of past champions, making the question both tactical and nostalgic.