There are almost as many different rating scales are there are climbs. Here's a chart to help you figure out what you just flailed on, and give you a nice excuse like "Oh, I thought that was an 7c(FR), and it was really an 7c(GB), no wonder it was so hard!". :)
You can get a copy of your very own.
YDS UIAA FR GB ------ ------ ------ ------ 5.2 II 2 <4 5.3 III 3 <4 5.4 IV 4a <4 5.5 IV+ 4b 4a 5.6 V- 4b+ 4a/vs 4b/vs 5.7 V 4c 4b/vs 4b/hvs 4c/hvs 5.8 V+ 5a 4c/hvs 5a/hvs 5.9 VI- 5b 5a/hvs 5a/E1 5.10a VI 5c 5a/E1 5b/E1 5.10b VI+ 6a 5b/E1 5b/E2 5.10c VII- 6a+ 5b/E2 5c/E2 5.10d VII 6b 5c/E2 5.11a VII/VII+ 6b+ 5c/E3 6a/E3 5.11b VII+ 6c 6a/E3 5.11c VIII- 6c+ 6a/E4 5.11d VIII 7a 6a/E4 5.12a VIII+ 7a+ 6b/E5 5.12b VIII+/IX- 7b 6b/E5 5.12c IX- 7b+ 6b/E5 6b/E6 5.12d IX 7c 6c/E6 5.13a IX+ 7c+ 6c/E7 5.13b IX+/X- 8a 6c/E7 7a/E7 5.13c X- 8a+ 7a/E7 7a/E8 5.13d X 8b 7a/E8 5.14a X+ 8b+ 7b/E8 5.14b X+/XI- 8c 7b/E8 7b/E9 5.14c XI- 8c+ 7b/E9 7c/E9 5.14d XI 8d 7c/E9[an error occurred while processing this directive]