He tried to turn the 1700 into 7000 and lost it all. He won back the lost investment in 5 plays, but he lost on his 27th play.
It's not clear what he was trying to do, but 7000 wasn't his goal, since he reached that and kept playing.
While he was playing I got the impression that he had resolved to play until he lost. I think he said several times for investors not to worry about his wins because they would get their coins back in the end, or words to that effect.