Elite chess grandmasters are twice as likely to make irrational moves when they are afraid of losing than when they are trying to win.
Irrational loss aversion sways even the most disciplined and logical minds in the world. High-stakes tournaments reveal that professional players perform significantly better when defending a position than when attacking one. This effect doubles under time pressure, showing that stress amplifies our basic biological fear of losing what we already have. Even people trained in pure logic for decades cannot escape this cognitive bias. It confirms that the human brain is hard-wired to prioritize avoiding loss over achieving gain, regardless of expertise.
Loss Aversion: Evidence From Expert Chess Tournaments
SSRN · 5309380
Do losses loom larger than gains in high-stakes, real-world decision-making, and does time pressure amplify this effect? We study the behavior of elite competitors in the World Rapid and Blitz Chess Championships, leveraging detailed move-by-move analysis and round-level variation in monetary incentives. Our setting offers a rare natural experiment: participants face substantial, exogenously varying prize incentives and systematically different time constraints, yet compete in an otherwise const