Compiling Go database can sometime be quite tricky. Earlier today I had to work like a detective to find the information I required.
I was working on the score chart of the 4th Chinese Longxing, a tournament held in 2012. Given the time wasn't very far away I was hoping that collecting information online wouldn't be difficult. I was wrong. There was one round 1 game between Liu Xiaoguang and Gu Lingyi. The game record was missing from all major Go sources in China. After reading several news reports, I learned that Gu Lingyi was the winner and I got the know the game date. But I could not find which player took black.
Luckily I found the attached photo using Google image search. I can recognise Liu Xiaoguang and Gu Lingyi playing in the forground. Then from the name tags on the table I knew that playing in the background was Shi Yue and Hu Yuqing - they happened to be in the same tournament according to a kifu I collected elsewhere. So I concluded with high confidence that the photo was indeed taken during that tournament. Then I could see that Gu Lingyi's hand was on white bowl. Another news report did mention that Liu Xiaoguang 'resigned' the game. So mystery solved and I got all required information to generate the missing entry in that score chart.