[Moore and Repullo, Econometrica 58 (1990) 1083-1099] and [Dutta and Sen, Rev. Econom. Stud. 58 (1991) 121-128] are two fundamental papers on two-agent Nash implementation. Both of them are based on Maskin’s classic paper [Maskin, Rev. Econom. Stud. 66 (1999) 23-38]. A recent work [Wu, http://arxiv.org/abs/1002.4294, Inter. J. Quantum Information, 2010 (accepted)] shows that when an additional ...