Played a game, my opponent's color was so similar to mine I didn't even know I was being attacked. :|
Green and slightly darker green.
http://www.color-blindness.com/coblis-color-blindness-simula...
For me, clicking the tritanomaly button doesn't really show a difference, but my friends say it's a drastic difference.
I've lived most of my adult life not knowing. I previously thought there were just a lot of designers that picked poor color palettes. Humorously, I thought they were color blind!