In reply to Snoweider:
I have seen the dyke chocked with ice and the surrounding area was a nightmare to get down early in the morning after being stuck overnight. School boys out there depth that night. Took some time to find a route through without crampons.
There are some unreported rock climbs on the saddle and one yet unclimbed cracker following a rib of granite looks no harder than HVS.
One big obvious route is the big vertical fault running up the back of Coire Daingean. Its even listed in the guide book notes as the "big vertical curving fault as yet unclimbed". This needs a good freeze as there is little protection apart from turf. We (Three of us) got ejected from it into the coire. One of the party didn't bother tying into the belay because it was really useless. Unfortunately when I suddenly got ripped off the belay I instinctively grabbed for something that happened to be my mate Nick. We got caught with the rope going round a rib of rock but Nick went the distance into the coire!
At first I was unaware I had grabbed him shouting up but then realised and seen him lying in the coire far below. We both started yelling and eventually the figure sat up. Next came a distant yell "Fraser you f##### B######.
Doable if frozen but we got it insulated with deep snow. We could see Nicks slide from Glen Rosa once back at the path. He never climbed again. Did try once while on holiday in Cornwall but didn't appreciate how much it had affected him until that day. Most regrettable thing I think I have ever done. But its still there for the asking! The large off width near the top I planned to use a custom made acro prop to protect. Below pretty much just peat hags n turf.
A good long easy route with some ice is the waterslide slab south of the Rosa slabs finishing up into the mini coire leading up to the summit of Goatfell. Theres plenty of ice being a high waterfall in summer so good protection and well off the vertical.
Getting things in condition on Arran is always challenging and I have had a number of visits being a waste of time. I think that's what puts people off. I only seemed to meet winter climbers on the ferry when conditions were too extreme in the highlands or there was a guide book about to be published. Not sure if "once in a lifetime" is still the hardest winter route on Arran but it was named because the conditions that day were just that. I took some pictures with my mothers kodak camera that unfortunately dropped down B2 gully. So your best placed to catch it when it does come in.
B2C rib would probably make a technical route with protection all the way is another I thought about doing solo with back rope. still to be done.
Minotaur would be hard but needs good ice build.
Not talking new routes I hear pinnacle ridge on N face Cir Mhor is one of the best winter climbs on Arran. I tried it as a school boy unaware it had already been done but down climbed after getting myself out my depth with little in the way of gear. (Mate had a slaters hammer as a ice tool)
Achir has the giants staircase which we bailed due to just rock further up. But better conditions? Achir itself is a good adventure in winter. Better south to North, I of course did it the other way and ended up with finishing in the dark!