Darts<br>John and Jim were at the bar. John challenged Jim to darts. Jim agreed to the challenge. They played a game of darts. John beat Jim in the dart game.
Jim thought darts would be fun, so he asked John to play.
John is the one who asked Jim to play darts, not the other way around. It might have been difficult for the system because their names are similar. 
( z1 think :ARG0 ( z2 person :name ( z3 name :op "Jim" ) ) :ARG1 ( z4 fun :ARG0 z2 :ARG1 ( z5 dart ) ) :ARG0-of ( z6 cause :ARG1 ( z7 ask :ARG0 z2 :ARG1 ( z8 play :ARG0 ( z9 person :name ( z10 name :op "John" ) ) ) :ARG2 z9 ) ) )