Is Conceding Allowable Etiquette?

[Ceaseless]

Does the score differs between finishing the game and conceding the game?

If by "score" you mean the respective ELO adjustments for each player, then no.

Note, this is different from someone quitting the game or being expelled after running out of time. In that case your ELO gain is scaled by the percentage of the game that had been completed. How that percentage is calculated is up to the game developer.

Given the post they quoted has "But if in a lost situation you play on and on for a while and then resign just before counting points, then that would be a bit rude. When you missed the chance to resign politely earlier, then you should at least finish the count to reveal the exact score." I think the score they refer to is the score in the Go game itself. Don't know if the person they asked will reply to such a necrobump though.

[Meeplelowda]

Does the score differs between finishing the game and conceding the game?

If by "score" you mean the respective ELO adjustments for each player, then no.

Note, this is different from someone quitting the game or being expelled after running out of time. In that case your ELO gain is scaled by the percentage of the game that had been completed. How that percentage is calculated is up to the game developer.

Given the post they quoted has "But if in a lost situation you play on and on for a while and then resign just before counting points, then that would be a bit rude. When you missed the chance to resign politely earlier, then you should at least finish the count to reveal the exact score." I think the score they refer to is the score in the Go game itself. Don't know if the person they asked will reply to such a necrobump though.

Good point. I'd originally written a response assuming that's what they meant, but then decided I misunderstood them and edited it because it seemed obvious that for a game that actually keeps a score, if you had continued the game the score would likely have changed. I didn't consider the specific edge case that conceding happens between all substantive moves being made, but before the game tallies the final score.

[smattathias]

You did nothing wrong. You owe nothing to a stranger.

If you establish a regular gaming routine with someone, you will develop a sense of whether to concede early or go until the final move. In that case, you’ll know with certainty which is appropriate.

[Jadetiger]

I've only played 3 games total, so I wouldn't have recognized that it was a losing position before the point when I did. But I've played thousands of games of chess, and never have I seen someone complain that they were not allowed to make the final checkmate. To the contrary, it is widely viewed as rude if you don't concede (resign) in an obviously lost position, e.g. Queen and Rook vs. no material with no time pressure. So this "finishing move" obsession seems funny to me.

As a hobby Go player, I can also confirm this. In Japan at least, it considered an outright insult if you don't concede in an obviously lost game because with playing on, you state that you believe that your opponent will make a weak move soon.
In Hive, I have seen it as polite if you kill yourself in an inescapable situation.
I personally see conceding in Hive as a double-edged sword. Conceding is noble because it shows strong character to acknowledge your own defeat, but I also quite often was able to crawl out of seemingly hopeless situations by fighting on like a mad dog.

[d_pelle]

Conceding the same is good if the outcome is clear. It's especially useful if the win of the opponent is trivial but would still take multiple moves. I often concede (aka resign) in chess or in Quoridor when the outcome is clear enough. I don't understand why would anyone complain when a player concedes a game.

I'd say it's the opposite which is annoying, i.e. when a player continues a game despite the outcome being very clear.