Question: "When in market history has an unfilled gap-ridden rally ever been sustained?" Answer: I havent found any. However, there are many instances when gap-ridden moves have been completely retraced. So far there are 8-10 unfilled gaps in the SPX and COMPQ. Youtuber showing the gaps and extreme RSI calling this a fools rally: http://www.youtube.com/watch?v=lyciBJvyj7g