  Fairness is an important trait of open, free markets. Ethereum is a platform
meant to enable digital, decentralized markets. Though many researchers debate
the market's fairness, there are few discussions around the fairness of
automated markets, such as those hosted on Ethereum. In this paper, using pilot
studies, we consider unfair factors caused by adding the program. Because
CryptoKitties is one of the major blockchain-based games and has been in
operation for an extended period of time, we focus on its market to examine
fairness. As a result, we concluded that a gene determination algorithm in this
game has little randomness, and a significant advantage to gain profit is given
to players who know its bias over those who do not. We state incompleteness and
impact of the algorithm and other factors. Besides, we suppose countermeasures
to reduce CryptoKitties' unfairness as a market.
