talking bout 屈機 it was a term invented by the 'loser' exclusively when you were using the term to describe a duel of 2 real players as opposed to playing against the computer(*)
when a player was beaten up by his opponent so badly and he had no way to fight back nor defend himself then somebody invented the term 屈機 to describe the situation
(*) I will say 打方 (formula) was more descriptive when playing against computer & 屈機 was used mainly for duels of 2 real players
and these kind of things happen when some loser watching your friend playing foolishly and decided to 跟機 (start a duel) and then a more skillful friend appeared to 幫拖 (help out)
taking into consideration the rules by defacto of HK arcades you are supposed to lose the second round aka 「讓round」when you know your skill is way above the other guy but yeah sometimes some guy will pretend to be weak, lose his 1st round, ask you to 讓round, and surprise you in the 3rd round ... those are real axxhole