A short summary

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Sumo

Sumo (相撲 (Sumō)) is a traditional wrestling style, originating from Japan.
grips on the opponent's garments grip fighting/changing grips during the match.

Techniques

We don't know much about Sumo's arsenal of techniques, except that .
Harite — slapping the opponent's face with an open hand, is allowed.

Objective

Force the opponent out of a circular ring (dohyō) or into touching the ground with any body part other than the soles of his feet.

Competition

The matches traditionally take place on the dohyō - a circle made of partially buried rice-straw bales mounted on a square platform of clay. The match duration is limited to 4 minutes (in the top division).

We don't know if any weight classes are established.
We don't know whether it is allowed for women to participate in Sumo competitions.
Professional sumo excludes women from competition and ceremonies. Women are not allowed to enter or touch the sumo wrestling ring (dohyō) (Wikipedia)

Some external resources on Sumo: