I don't think the only point of many games is winning. If you play Go and want it to be an enjoyable experience it makes sense to stick to the general of code of conduct for Go.
Competitive games like Go are most enjoyable when people all agree on the same rules, when losing grants you no excuses to salvage pride at the cost of the victor. For this to work, the rules must be unambigious. You either broke them and are a cheater and the match is invalid, or you exploited them and won fairly. Subjective codes of honor are extremely ambigious. My competitive game of choice (though I rarely play it these days) is Warcraft III, and the online community associated with it is rife with these kind of "codes of honor" (mostly in t...
Rules: