One of the EPO's Technical Boards of Appeal has recently reminded the community of the front-loaded nature of inter partes opposition proceedings. In proceedings leading to decision T 2193/14 dated 14 March 2017 and made publicly available on May 11 2017, the opponent was deprived of the possibility of having certain prior art citations considered which purportedly were relevant for the assessment of non-obviousness. The Board of Appeal denied the admissibility into the proceedings of the aforementioned citations, which were submitted by the opponent on appeal only, and eventually confirmed the patentability of the claimed subject-matter without having considered the citations in question on their substantive merits.