Stolen from the footnotes of Lines of Destiny, the only place I remember 
seing descriptions:

- The Saotome Forbidden Techniques are a dual set of thieving techniques
designed by Genma when he was younger. The moves are divided in two main
categories: The Yama-sen-ken [Mountain of the 1000 fists] and the
Umi-sen-ken [Sea of the 1000 fists]. Both are actually styled in ways
similar to attacking a house. The Yama-sen-ken moves are all highly
aggressive and violent, like a violent and aggressive thief attacking a
house. The Umi-sen-ken are quiet and soft, but more difficult. It's a 
higher
art, like a sneak thief attacking the house at night, while the 
occupants
don't notice.

    In the manga, Genma had "generously" given Ryuu Kumon's father the 
Yama
scroll, to help the Kumon Dojo, which was basically falling apart. 
However,
after practicing on the Dojo itself, Ryuu's dad pulled the building down 
on
top of him. His last words to Ryuu were to find the Umi-sen-ken, with 
which
he believed the restoration of the Kumon Dojo could be possible. 
Afterwards,
Ryuu wandered around, naming himself "Ranma Saotome" (Ranma had doodled 
his
name on the Yama-sen-ken scroll), and happened to save Nodoka one day, 
and
named himself as "Ranma Saotome". Ryuu then stayed at the Saotome house 
for
several days, during which he was naturally challenged by Ranma.

    In a latter fight, Ranma was almost killed by one of Ryuu's attacks, 
and
later demanded that Genma teach him the Umi-sen-ken. Genma briefly 
showed
Ranma some of the moves on Ranma's body, which was enough for Ranma to
understand, and then train to perfection the style of the Umi-sen-ken.
Meanwhile, Ryuu was close to beating up Nodoka because he thought she 
had
the Umi-sen-ken scrolls - they had been given to her by Genma before he 
left
on the training expedition with Ranma, though Ryuu couldn't bring 
himself to
do anything.
In the final battle, it was agreed that if Ryuu lost, he would 'seal 
away'
the Yama-sen-ken, while if Ranma lost, Ryuu would get the Umi-sen-ken. 
Ryuu,
hoping to learn the Umi-sen-ken off Ranma, deliberately tried to get 
Ranma
to attack him with them, which Ranma did so. However, Ryuu could not 
follow
the moves, and on Ranma's first attack, he found himself lying on the 
ground
in pain.
The battle ended with Ryuu literally buried in a large mound of dirt.

Yama-sen-ken techniques from the manga:

Mouko Kaimon Ha [Fierce Tiger Crashing Through Gates]: Right after 
shouting
"Don't move!" very loudly, Ryuu strikes at Ranma, throwing both arms in 
a
curving motion away from him (a bit like roughly pushing through two 
doors)
and kicks him at the same time.

Kijin Raishuu Dan [Demon God Assault Bomb]: Ryuu practices this move on 
a 5m
high solid rock/metal Buddha, breaking it into large slices with thrown
chi-blades formed by pulling one's hands away so fast is forms a vacuum.
It's Ryuu's favorite attack.


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