Climbs

Moderately difficult. Number immaterial. Leader requires forty feet of rope.

The north-east shoulder is broad at the top, affording nothing more than a walk, but it throws down a wide expanse of steep slabs to the shore of Llyn Idwal.

A good and much-frequented climb lies up them. A cairn marks the starting-point. A shallow groove, heathery in parts, but furnished with adequate holds, is followed for fully 300 feet. A projection, crowned by a lodged boulder, is then close by on the right side. This may be climbed either fairly straight or by a zigzagging edge. An easy alternative lies on the left. From the terraces thus attained the climber can descend to the lower end of Cwm Cneifion, continue upwards by an obvious route to the top of the shoulder, or reach the same by interesting variants on the wall above the slabs.

For the sake of completeness it should be added that an attempt on the slabs farther to the west was not wholly successful, a traverse off being found necessary to the wall of the Idwal Staircase. [1]

References

[1] Climbing in the Ogwen District (1910)

At one point the route sported a bolted on hold. Martin Berzins:

This is, of course, a major step forward.

Now bolt on holds and bolt runners make it possible for not only the protec­tion, but the technical difficulty also to be reduced to the level of the person who wants to 'do' the route Bravo! Sport for all! [1]

References

[1] Mountain Issue 141 (1991), page 14 https://climbing-history.org/library/11320/mountain-141

The name is an anagram of thumb heresy, because the route starts up The Thumb and finishes up Heresy.