Board Thread:Editing Discussions/@comment-26391060-20141116023151/@comment-6697950-20141116090836

As far as I remember, the only thing mentioned about duels was:

"Like in SAO, there were 3 modes selectable at the bottom of the window. Beginning from the top, they were «First Strike Mode», «Half Loss Mode» and «Total Loss Mode». In the previous Aincrad, duels were basically all done in first strike mode. Obviously losing all your HP was out of the question, even if it was half loss mode, it was possible to reduce someone's HP to the danger zone if the finishing hit was a critical hit."