The pilot reported that during the landing flare on a backcountry airstrip he lost forward visual sight due to a sun glare. The pilot further reported that as he was about to perform a go around, the wheels touched down and the airplane veered off the airstrip to the left. During the runway excursion, the left wheel hit a soft spot and the airplane nosed over, which resulted in substantial damage to the right wing strut and fuselage.
The pilot reported that there were no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation.