The LG Cup Controversy: A Fair Play Debate
In a critical match of the LG Cup, Chinese player Ke Jie raised concerns about the fairness of the referee’s board sealing procedure, which potentially gave his Korean opponent extra thinking time.

The recent controversy in the 25th LG Cup finals between China’s Ke Jie and his Korean opponent has sparked intense debate in the professional Go community. The incident centers around a crucial moment when the referee intervened to seal the board, a standard practice in professional Go matches, but the timing and execution of this procedure have been questioned.
When examining the sequence of events, it becomes clear why Ke Jie’s concerns merit serious consideration. The Korean referee sealed the board during Ke’s opponent’s thinking time, effectively giving the opponent additional time to consider his next move without consuming his clock time. This situation bears striking similarity to historical precedents in professional Go, where the fairness of timing in sealed moves has been a critical factor.
The significance of timing in professional Go cannot be overstated. In high-stakes matches like the LG Cup finals, every second of thinking time is a valuable resource, comparable to the strategic advantage of position on the board. This principle is well-documented in Go history, such as the famous 1933 match between Wu Qingyuan and Kitani Minoru, which lasted three and a half months partly due to the careful consideration of timing.
The professional Go community has established practices regarding board sealing, particularly in international competitions. In Japan, for instance, sealed moves are typically handled with strict protocols to ensure neither player gains an unfair time advantage. The practice involves writing the next move in a sealed envelope before any clock stoppage occurs.
This controversy also highlights broader issues in international Go competitions. While the LG Cup is one of the most prestigious tournaments in professional Go, the incident raises questions about standardizing rules and procedures across different countries' Go organizations. Many experts argue that clear, universal protocols for situations like board sealing are essential for maintaining the integrity of international competitions.
From a technical perspective, the impact of extra thinking time in modern Go is particularly significant given the influence of AI analysis on professional play. Players now understand positions with unprecedented depth, making any additional analysis time potentially game-changing, especially in critical positions where every subtle detail matters.
The response from the Korean Go organization, focusing on technical rule violations rather than addressing the timing issue, has only intensified the debate. This approach mirrors similar controversies in other professional sports, where technical interpretations sometimes overshadow fundamental fairness concerns.
This incident may well lead to meaningful reforms in professional Go tournaments. Just as the advent of chess clocks revolutionized professional chess, the Go community might need to develop more precise protocols for handling game interruptions and sealed moves in the modern era of professional play.