Immediately prior to joining a Mountain Ventures climbing course. Solo. I left Zermatt at 08:00. After reaching Spitzi Flue went along Schwarzgrat . I climbed two pinnacles and subsidiary top. Grade II. I ascended Fluehorn 3317m – scree slopes both sides. There was more grade II climbing to tops at 3272m and 3230m. Near the summit of the latter I dislodged a small stone which rolled down the mountain, striking a very large boulder which also rolled down the mountain and across the length of the glacier to the north. I reached the path to the Oberrothorn, and used it to reach the summit of the Oberrothorn 3415m. I descended on paths back to Zermatt which was reached at 20:15.