The power and skill aspects are usually considered with reference to recent tournament performance. The "de facto" standard is to win two consecutive championships as "ōzeki" or an equivalent performance. In the case where the "equivalent performance" criterion is used the wrestler's record over the previous three tournaments is taken into account with an expectation of at least one tournament victory and two runner-up performances, with none of the three records falling below twelve wins. Thus a consistent high level of performance is required. Winning two tournaments with a poor performance between them is not usually sufficient. The rules are not set in stone and hence in reaching their conclusion the Yokozuna Deliberation Council and Sumo Association can interpret the criteria more leniently or strictly and also take into account other factors, such as total number of tournament victories, the quality of the wins and whether the losses show any serious vulnerabilities.