If you think that a GM does not fall prey to an easy one-move combinations, then take a look at the puzzle below which I am very sure many can solve easily

Lol

umm, i forgot who.. i think kramnik.. im not sure.. and idk who he was playting.. i think a computer.. im not sure... he missed a mate in 1.. no time trouble or anything i believe... and then he ended up losing later on.. that must suck.. doesnt it.. like wow... i never missed a mate in 1 in my life... as far as i know..

Yep, Deep Fritz vs Kramnik.