Quote from lindq:
Capitulation indicates sellers in large numbers throwing in the towel.
The chart shows a sharp and rapid selloff on high volume.
The keys to that sentence are 'sharp' and 'rapid'. (High volume isn't always a key on intraday timeframes, although it can help on daily bars.)
Note that capitulation is not simply a pullback, which can be more gradual and not often tradeable. But when you look at a chart and imagine that if you owned the stock you would be in a serious panic, then you are getting in the ballpark.
When you see such a pattern, consider it a setup, not an entry. Set a buy stop slighly above price so it will fill if price recovers. If it continues falling, lower your buy stop. Rinse and repeat.
If and when you are filled, set a stop loss at whatever level is comfortable for you considering timeframe. Raise the stop to even once you can do so comfortably, and the rest of the ride is free money. Just remember that pigs get fed but hogs get slaughtered, because profits on this type of trade can vanish quickly if you stay at the feeding bucket too long.
If you can find this chart pattern on a couple timeframes, daily and intraday, then you'll have a good probability setup.