Chain of tools

"A bad worker always blames their tools" - If somebody does a job badly or loses in a game and claims that they were let down by their equipment, you can use this to imply that this was not the case.
http://www.usingenglish.com/reference/idioms/bad-workers-always-blame-their-tools.html
"It is unfortunately very common to blame the operators for accidents when they have been put into a situation where human error is inevitable."
High-Pressure Steam Engines and Computer Software

"A bad worker always blames their tools" - If somebody does a job badly or loses in a game and claims that they were let down by their equipment, you can use this to imply that this was not the case.