Regarding chess Ayatollah Sistani’s ruling is clear as to it is being haram without question regardless of gambling. Though i would like to know of the hikmah (wisdom) behind it and as to which elements of chess make it haram per say. As in the current times chess is not related to gambling and is mostly seen as a brain exercise and a competitive sport. Therefore, the confusion as to what leads to such a sport having such severe consequences as mentioned in hadith, though i could not find a hadith relating its elements which cause it to be as such.

It appears to have been a major tool of gambling for kings and governors. In absence of clear reasons, it becomes a matter of submission