From Robin's Guidebook: "Starting on small holds below the jugs, climb into The Fin and finish the same as River Dyno Direct. Also rated generously, but still fun." 

 The guidebook rates this a "generous" V7, I agree that's generous. I started with a left hand sidepull and right hand in a bad horizontal hold that could be a crimp rail or undercling. Not dabbing is part of the challenge. Be sure to go all the way left (past the seam) before topping out on the slopers (no jugs!) for the intended beta. 

The Fin - Low Start

The Fin

Bluntly Benign

River Dyno Direct

Sans Fin

River Dyno

Slingsby's Arete

Reach up to jugs on the right side of the boulder. Move out to the "fin" then follow the fin up and right. Alternatively, from the "fin" continue moving up and left to finish on the tallest part of the boulder.

Stand start on a slopely left hand crimp and a tiny right hand crimp pinch. One big move up to the V-slot, then continue straight up to top out.

Same start as River Dyno, same crux move to the fin, but instead of using the great jug to the left, go up and slightly to the right using only the slopers to top out. As far as I can tell, that tempting grove right there in front of you is on for use during topout.

 This is graded V8 in other sources, and while I agree with others the first move is still the crux, it doesn't feel like my place to downgrade a problem two grades, so I offer V7-8 as an unsatisfying compromise for now. Tell me your thoughts.

Start the same as the Fin. From the start holds mantel up and top out. You do not move left to the obvious fin jug. 

Starting below and left from the prominent "fin" jug on a left sidepull and right hand gaston. Make the long move up to the fin, and then finish up and left on the tallest part of the boulder.

Sit start low on the arete left of the "fin" jug. make a hard move up to the v-slot jug, then pull awkwardly and into easier terrain.

This boulder is very recognizable from the centrally located fin-shaped-jug at about the 8ft mark.

Description

Location

Protection

Routes in Fin Boulder aka Trailside