Logic

Bot Name

Logic

History

• 1.1: rated 1714, ranked 5.
  • Reorganized/rewrote code.
  • Fixed serious bug in gun.
  • Tweaked movement.
  • General improvements all over.
• 1.01: rated 1687, ranked 14.
  • Removed corner-grabbing movement.
  • Movement tweaking.
• 1.0: rated 1684, ranked 17.
  • Uses GuessFactorTargeting.
  • Evaluates positions on their risk instead of how they are different from Logic's current position.
  • The risk function is reworked to be much more simple.
  • Has basic OneOnOne movement.
• 0.34: rated 1686, ranked 13. May be worse than 0.32, but the melee rankings are fluctuating so much it's hard to tell.
  • Fixed bug in setting velocity.
  • Added radar lock.
  • Uses circular targeting in duels.
  • Some more tweaking.
• 0.32: rated 1693, ranked 12.
  • A lot of tweaking...
• 0.31: rated ?
  • Greatly increased execution speed.
• 0.3: rated ?
  • Completely rewritten code; much more clear and efficient than previous versions.
  • More complex movement.
  • Now only moves towards a new point if there is a big advantage in the new location or it has stopped moving.
  • CircularTargeting at close range.
  • No one on one movement (out of laziness, not strategy).
• 0.21: rated 1679.6 ranked 22, gone down to 1660 (ranked 30).
  • One-on-one movement is now better at avoiding linear and head on targeting.
  • It now takes into account when it's the nearest robot to an enemy.
  • Tweaking...
• 0.1: rated 1665.36
  • Initial release: very messy code, but fairly competitive.

Author

Kev

Extends

AdvancedRobot

What's special about it?

It's my first competitive robot!

Great, I want to try it. Where can I download it?

http://www.cs.utexas.edu/users/pclark/kc.melee.Logic_1.1.jar

How competitive is it?

Logic is the first melee bot to break Rozu and ABC's dominance of the top 5. It is currently rated over 1700 and ranked 5th.

How does it move?

MinimumRiskMovement, trying to stay away from and parallel to enemies. It reacts more to enemies that are near, strong, or likely to target Logic. It also tries to avoid being the nearest to another robot and dodges HeadOnTargeting by repelling its last position. When it stops moving or finds a significantly better point to move to than the current one, it heads towards the new best point.

How does it fire?

It uses GuessFactorTargeting, firing Waves when it sees an enemy and extrapolating the other robot's position linearly for passed waves. Currently segmented on distance, relative heading, wall, and duel/melee.

How does it dodge bullets?

Logic tries to stay parallel to enemies, especially if they're likely to be shooting at it. It doesn't actually react to being hit, only to the positions of the other robots. A small anti gravity point where it last went helps against HeadOnTargeting.

How does the melee strategy differ from one-on-one strategy?

Logic preforms completely different in OneOnOne battles:

• It uses simple StopNGo and RandomMovement (almost exactly the same as Vyper).
• The gun segmentation changes slightly (relative heading replaced with time accel).
• The radar locks permanently.
• It uses lighter energy management.

How does it select a target to attack/avoid in melee?

It attacks the closest enemy with a tendancy to finish weak robots off, only switching targets when it has high gun heat.

What does it save between rounds and matches?

GuessFactor data.

Where did you get the name?

Erm, it's logical.

Can I use your code?

Sure. It's included in the jar and released under the terms of the RWPCL.

What's next for your robot?

Logic is now out of the rumble because it has been replaced by WaveSerpent, which has melee behavior based off Logic.

Does it have any WhiteWhales?

WhiteWhales don't really occur in melee, but its competing with the host of new high level melee bots such as Phoenix, Gladiator, Freya, X2, and Griezel

What other robot(s) is it based on?

SnippetBot! Watching other great melee bots fight and the wiki's excellent entry on MeleeStrategy inspired its movement. Specifically HawkOnFire showed me how simple good melee movement can be. The gun and movement both use ideas from Coriantumr. The duel movement comes from Vyper.

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Comments, questions, feedback:

Welcome to the wiki! Logic seems a strong melee-opponent. Melee-rankings will stabilize once you reached 1000 battles, but they will never be rock-solid. Your current ranking gives a fairly good indication though. -- GrubbmGait

I've seen Logic sometimes 'looking the other way' when the battle is down to two bots. This probably has to do with the fact that you compare strings like this: if (stringa == stringb). You should use if (stringa.equals( stringb)). And you are right, I really don't want to use your code ;-) -- GrubbmGait

I believe I fixed this in version 0.21, but I'm not too sure. On the bright side, I've figured out how to use arrays so my code won't look so appalling. -- Kev

Hi Kev, when i run the meleerumble and Logic 0.3 is one of the competing bots, the battle hangs/runs for ever. Any ideas what can be the cause of this? (b.t.w. i use Jdk 1.5.0) --Loki

Yep, I forgot to turn isSG to false, so Logic could have been spending its time drawing pictures instead of fighting. 0.31 fixes this and generates far fewer points for its movement, so it will run way faster. -- Kev

Logic hasn't got any battles in the melee rumble since I replaced 0.3. Anyone know why? -- Kev

I see 0.32 as having almost 700 battles, the last one from earlier today. Are you running the RoboRumble@Home client for melee? ...and what do you have your BATTLESPERBOT set to? -- Voidious

Wow!!! Logic is placed in 10th, far higher than I expected. It is possible that Logic was so far up that I simply overlooked it :). Oops... -- Kev

Heh, that made me laugh ;) Congrats on entering the top 10! Edit: I guess I should check the latest rankings before making a comment like that - but congrats on the rating jump, anyway... -- Voidious

Thanks! Pleasant surprises like that are always nice. I would definitely like to get a robot in the top 10, but I think 0.33 will be my last release for a while (unless it is terrible :). It's back to WaveSuffering for me... -- Kev

Welcome to the runners-up ranking from 9 till 14. Which one of us (X2, Freya, Logic, Griezel or Gladiator) will be the first to threaten the almost untouchable ABC and Rozu? -- GrubbmGait

ME!!! ha, yeah right... no, i'm to consumed with one on one right now (i'm WaveSuffering too), but maybe i'll give you guys a run for the money. -- KID

Something is seriously wrong with Logic 0.34 - it's ranked 98 and looses to SpinBot and Walls. Has anyone seen what is the cause of this? -- Kev

Probably Logic crashes with someones client, causing it to get only some survivalpoints. You are not the only victim though, see RoboRumble/RankingChat. Therefor I suspect that the problem lies at someones client. Maybe the cpu setting in the ini-file is set on 1? -- GrubbmGait

Well, since neither SpinBot nor Walls are in the Rumble, I assume you are running personal battles. Perhaps Kev added a kill-switch (like Ugluk) that disallows battles not 35 rounds long? -- Martin

All sample bots are in the melee rumble. -- Florent

I would like to see how Logic 0.34 really preforms. Will removing it from the rumble and adding it again clean its record? -- Kev

Nope, you need to give it a new version number. -- Voidious

OK, Logic is re-released. -- Kev

congrats!!! looks like a solid 5th place in Melee (12 points ahead of no.6) and maybe even a 4th place. Very good work. --Loki

It seems that you really are the first to attack the bastion of rozu and ABC. Congratulations! (Although I see some strange results for f.e. FloodHT and StoneGhost) -- GrubbmGait

Yeah, big congrats on the #5 spot! I saw you there earlier, but I wasn't sure if it was stable yet. Keep up the good work! -- Voidious

Very nicely done, this is a very strong melee bot. --David Alves

Yay, 5th place!!! I think this is the first time I've seen a non Rozu or ABC bot get that high. Thanks all, again Logic has preformed way better than I expected. Next up is for me to combine Logic and WaveSerpent and see what happens... -- Kev