Please not another SittingDuck...
The highlighted comment was created in this revision.
Hi mates. can i suggest to remove the new 'SittingDuck'. Its probably the worst that could happen to the melee rumble. Someone stated why it is, but i can't found the thread right now. And beside, there is no competition on the end by just raising an exception to disable the bot as fast as possible.
Feel free to remove them yourself. I think it is best if we actually remove all except the regular 'SittingDuck' from the melee rumble, because it affects all other pairings as well in melee battles. Having them in 1v1 is not so bad though, because individual pairings do not get affected.
If you think the competition for the bottom is screwing up melee ratings, then remove the weak bots, but I prefer if they all stayed.
Actually, it IS possible to have a lower rank than my SuperSittingDuck. And I need to change the name as there was already another SuperSittingDuck from the super sample bots set.
Ok i remove all bots that have no 'valid' behavior (like throwing an exception to disable). Not sure about the 'waste energy as fast as possible' - i guess i will let it in for now.
More matter how low the codesize is, ranking lower than SittingDuck requires a bit of insight and should have its merits.
I agree, and if it causes some issue with the MeleeRumble scoring, it's a problem with the scoring system (which definitely has its issues), not the validity of the bots. But I also agree that throwing an exception is an unfair approach to getting a low score and don't mind if we ask folks not to do that.
Well, not sure, but i guess there is no scoring system that can handle an unevenly distributed advantage of fighting against 8 instead of 9 opponents. The more 'ducks' the competition gets the more will the score spread and it will take ages to get a settled score. Its clearly a difference to fight 8 (or even less) instead of 9 opponents. Not to speak about the 'free' energy gain for the lucky bot who starts near the duck.
More ducks will reward prey-on-the-weak strategies more. Although this kind of strategy will always be rewarded to some extent in battles with 3 or more bots, with or without ducks.
As a note, there are intentional biases in robocode's score system that work to reward certain types of behavior anyway. Note the bullet damage and kill bonuses. Any way you do score will have some kind of biases or "value judgements" in it really. Even with the most pure "survivalist" scoring systems, a subjective judgement about what makes a "good bot" is being made.
With the scoring system as it is in melee, the action of adding and removing sitting ducks is a bigger problem than their presence or absence. Due to how melee scores are based on battles with a random sampling of robots in the rumble at the time, a change in the probability of a sitting duck being in the battle affects newer bots more than bots who already have most of their battle count. Adding the ducks gives a bias in favor of newer robots, and removing them gives a bias in the favor of older robots.
Of course... this problem happens in the melee scoring system for addition/removal of any bot. It's just a more blatent with sitting ducks than more "typical" bots...
ELO Rating system suffers less from this addition/removal problem in melee.
