Bad sportsmanship/showboating

Is it considered bad if I am playing a game and figured out a mate in 3 moves, but instead I decide to either capture all the opponent's remaining pieces and/or try to promote all of my pawns to queens before he resigns? 

you can if you want, but hwy would you waste your own time?

Massive promotions followed by a careful stalemate is always fun

It's certainly bad technique. 

But then it depends on who you're playing. If you're playing someone with a low rating then finish the game as efficiently as possible. If someone with a high rating (or a computer) refuses to resign, then whatever punishment you see fitting is fine. Your opponent can always resign if they don't like it.

interesting dialogue

So I've noticed that chess players are really pretentious... But yeah, I enjoy the genocide technique.

Once upon a time (on another website) I played a guy who would never resign regardless of how hopeless his position was. I had a queen and three pawns against a lone king.

I thought jeez this guy never resigns, it's so pointless. Mating him with the queen and king would be boring so i forced the promotion of all three pawns to knights, then gave him my queen so i could practice mating him with three knights and a king(avoiding stalemate can be tricky).

Is this bad sportsmanship?

Maybe, but it can't be as bad as not resigning a completely hopeless position i suppose ^_^

Well put.

I have no ethical problems at all with underpromoting and practicing my B+N mating technique. My opponent always has the right to resign at any time if he doesn't like it.

I totally agree with Estragon. Why prolong it & risk making a mistake. ;)

after...pf3,p=q is mate

I woudl just resign if someone did that to me.  I think it's a bit rude, but I always have the option to resign when I feel like it.  I think it's amusing, though, when the person showboating blunders and gives me the game.

another point: what seems like "prolonging the game" to one player, might not be to another player.  I've had players who ignore an pretty mate to promote a pawn. Perhaps they didn't see the mate, or perhaps they enjoy the sadism.  Or maybe they just like the "safe" way to win. Sometimes a mate that's obvious to you will not be obvious to someone else of the same level.

Just finish your game and hope they make a mistake, or resign. You don't gain anything by assuming you know what's going on in their brain, and resenting it.

I do not understand you.

So i checked your rating. Well, there is a difference.

Maybe something that is logical at some point is not logical at other.

Best answer is: do what you feel.

Well its a good thing you got a chance to practice that very practicle situation!

yes, it's absoulutely bad form in any situation, against any opponent.  i think it's important to be just as gracious a winner as it is to lose with grace.  there are practical reasons as well.  bumbling your way to a long winded win around the board shows that you're immature and you don't value your time.  and you may find your way on the opposite side of the situation, so think how you would feel if the opponent did that to you.  the quick mate is the elegant way to go, every time.

teocaf to say something is absolutely bad form in any situation, against any opponent is dealing with absolutes and does not take into consideration when it is not bad form at all.

Suspose you are playing a master who plays on in a very simple pawn endgame which is a complete loss for him?  Does this mean that we cannot make the game enjoyable even though he is trying his best to waste our time?  Maybe if you make the game enjoyable for yourself it might show him not to keep playing for spite.

Making a little puzzle is not "bumbling your way to a long winded win"

And there is absolutely no chance you will be on the other end of this situation as you, yourself will not be delibertly wasting your opponent's time and patience.

I think there is something close to an absolute: don't showboat like this against a novice player. That player is doing the right thing by not resigning. It's best for all parties concerned if you simply show your best technique against a weak player. They will learn more from good technique than someone trying to rub their face in the loss.

i find your argument specious, to say the least.  if there are any exceptions, they only prove the rule.  you decide and reason out for yourself ahead of time how you will behave during any chess game and that will be your code of conduct.  so when faced with the temptation to be spiteful, you won't have to second guess yourself, because you will have already thought about it.  but i don't expect you or anyone to agree with me.  there's a great line in the movie "raising arizona" that might apply here:  "well, there's what's right and then there's what's right; and never the twain shall meet..."

well, it looks like i have some moves to make, so i will leave you philosophers to it.  best of luck in your games