The most common sankaku techniques you see in competition are yoko-sankaku and reverse sankaku. Ushiro-sankaku is somewhat rare although Lucy Renshall of Great Britain specializes in it. Interestingly, she often does a hold-down or an armlock from it and not so much a strangle. The way she comes up on top for the hold-down however might no longer be considered legal under the new rules.
The following examples are considered legal:
The following are NOT allowed:
Blog posts
New rules to punish players who waste time in order to catch a breather during matches.
New IJF rule on Ushiro-Sankaku
New rules about Ushiro-Sankaku.
A significant change has been made relating to grip breaking.