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Unread 16-04-2013, 11:56
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Re: Defense in Ultimate Ascent

Team 4054 had an amazing defensive robot this year. We went against them one match and we could only make one trip back to the feeder station even though we were one of the fastest robots at our regional. They would shoot for 12 autonomous points and have a 10 point climb and then they would shut down any team on the opposing alliance that tried to score. They ended seeding 5th. Defense is important in UA.
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Unread 16-04-2013, 13:00
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Re: Defense in Ultimate Ascent

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Originally Posted by DjScribbles View Post
+1 This. Traffic and congestion is important for cyclers. Really coordinated cyclers can work around it, but a well placed defender can slow down the whole opposing alliance, not just a single robot.
I concur. With the number of restricted zones, I've found that the best/most potent defense comes from zone defense rather than traditional man-to-man (or bot-to-bot if you will) defense. Stop all opposing teams from entering or leaving their feeder station. Can easily add a good 5-15 seconds per entry/exit if done right, meaning an additional 10-30 seconds per cycle. If the defender is a short bot, that allows them to cut under their pyramid to block a feeder bot from going around the long way, making their defense even more effective.

Defense like this can turn a 5-cycle bot (or a pair) into a 2-3 cycle bot(s).

Something that alot of teams seem to forget is that the defender is allowed to be in the feeder station and touching the feeder bot as long as the feeder bot isn't in the feeder station. And since most bots are longer than the feeder station is deep, you can actually use the backwall to help you keep them out. But goodness be careful you don't get boxed in by the opposing robot's teammate, or you'll be a sitting duck for penalties.
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Unread 16-04-2013, 14:10
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Re: Defense in Ultimate Ascent

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Originally Posted by Zebra_Fact_Man View Post
I concur. With the number of restricted zones, I've found that the best/most potent defense comes from zone defense rather than traditional man-to-man (or bot-to-bot if you will) defense. Stop all opposing teams from entering or leaving their feeder station. Can easily add a good 5-15 seconds per entry/exit if done right, meaning an additional 10-30 seconds per cycle. If the defender is a short bot, that allows them to cut under their pyramid to block a feeder bot from going around the long way, making their defense even more effective.
This is a nice game for beating zone D. There are just so many zones--coordinated offensive coaches can make even smart and well driven defenders waste a lot of time. If offensive bots avoid joining the same jam, even 2-3 cycle bots can keep the flow running pretty well. I'm not going to fight you for a feeder station when I can load under defense from the unprotected one, or (particularly if my ally you also haven't stopped is there), box you at the protected and spin in. Play either pyramid corridor and I have at least 3 choices: spin through, cut under to the other side, or go under and out the middle. Etc.*

*Ok, so it helps we drive swerve and don't telegraph directions. But it's really anyone's game--there's no guaranteed shutdown anymore than there's no guaranteed counter-D.
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Unread 16-04-2013, 14:36
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Re: Defense in Ultimate Ascent

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Originally Posted by Siri View Post
This is a nice game for beating zone D. There are just so many zones--coordinated offensive coaches can make even smart and well driven defenders waste a lot of time. If offensive bots avoid joining the same jam, even 2-3 cycle bots can keep the flow running pretty well. I'm not going to fight you for a feeder station when I can load under defense from the unprotected one, or (particularly if my ally you also haven't stopped is there), box you at the protected and spin in. Play either pyramid corridor and I have at least 3 choices: spin through, cut under to the other side, or go under and out the middle. Etc.*

*Ok, so it helps we drive swerve and don't telegraph directions. But it's really anyone's game--there's no guaranteed shutdown anymore than there's no guaranteed counter-D.
As the coach of a defensive team...thanks for the info
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Unread 16-04-2013, 14:45
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Re: Defense in Ultimate Ascent

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Originally Posted by 2789_B_Garcia View Post
As the coach of a defensive team...thanks for the info
There's nothing new about it (nor is it complete)--anyone getting 3+ runs has been doing it or a variation for 7 weeks. The information isn't what the options are, it's which ones teams will take. Good offensive bots won't forecast this.
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Unread 16-04-2013, 15:14
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Re: Defense in Ultimate Ascent

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Originally Posted by Siri View Post
There's nothing new about it (nor is it complete)--anyone getting 3+ runs has been doing it or a variation for 7 weeks. The information isn't what the options are, it's which ones teams will take. Good offensive bots won't forecast this.
Right, inside tip is that when a top offensive bot's coach says "Back to the feeder station" that actually means do a pirouette, a couple of evasive maneuvers, then magically climb and dump for 50.

Just kidding, but there's nothing new about that strategy. Those are really the only 3 'lanes' any bot can actually take. Either push through the direct route to the feeder, go all the way around the pyramid, or go under the opposing pyramid (though this option is usually closed to the taller bots.).
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Unread 16-04-2013, 16:27
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Re: Defense in Ultimate Ascent

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Originally Posted by Grim Tuesday View Post
I agree with the assertion that the golden bot will be able to cycle while being pushy. I disagree that they will use that power to play defense; they will use their pushiness to push through defense, if they are truly a good cycler.
Not looking to start a flame war, but I disagree 100%. Pushing through defence is nearly always slower than driving around it. Granted, very few teams have the brecoflex tread like you do, but if I am looking for a cycler on my alliance, I am looking for agility not power. Just ask anyone on 610. They have gotten 7 cycles in a single match, but that would be really hard to do while pushing.
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Unread 16-04-2013, 16:40
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Re: Defense in Ultimate Ascent

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Originally Posted by Sam_Mills View Post
I am looking for agility not power.
Exactly. Evading D has little to do with pure speed or pushing power, acceleration and deception are far more important.
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Unread 16-04-2013, 16:49
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Re: Defense in Ultimate Ascent

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Originally Posted by Jonathan Norris View Post
Exactly. Evading D has little to do with pure speed or pushing power, acceleration and deception are far more important.
A lot of offensive success in the game at the championship elimination level will come down to perceived agility resulting from consistently accurate predictions the moves of your opponent as well as dealing with how quickly they develop countermeasures to your counter-defensive strategy.

I would imagine teams like 610 achieved multiple six and seven cycle rounds not only because of mechanical ability, but strategic prowess that allowed the drive team to predict the actions and reactions of their opponents faster than any defense could keep up with. Speed of thought behind the glass is just as critical as speed behind the bumpers at this level.

The shrinking of the loading safe zone coupled with the third dimension to the scoring safe zone will continue to result in good coaches and strategists being able to pack as many scenarios into their heads to deal with the 2-minute blocks.
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Unread 16-04-2013, 16:57
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Re: Defense in Ultimate Ascent

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Originally Posted by Abhishek R View Post
Right, inside tip is that when a top offensive bot's coach says "Back to the feeder station" that actually means do a pirouette, a couple of evasive maneuvers, then magically climb and dump for 50.

Just kidding, but there's nothing new about that strategy. Those are really the only 3 'lanes' any bot can actually take. Either push through the direct route to the feeder, go all the way around the pyramid, or go under the opposing pyramid (though this option is usually closed to the taller bots.).
Exactly--except that I'd argue 3 is plenty. The lanes are no secret; it's how you use them that matters. This field is designed to let good offensive bots raise the opportunity cost of playing defense.

The strategies are far from new; in fact, they're far from exclusive to Ultimate Ascent.


As for pushing while cycling, I can only think of 3 general situations in which I'd push a non-scorer, and maybe 3 more that I'd push a scorer. (None of them involve pushing through one D bot to score.)
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Unread 16-04-2013, 17:56
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Re: Defense in Ultimate Ascent

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Originally Posted by Sam_Mills View Post
Not looking to start a flame war, but I disagree 100%. Pushing through defence is nearly always slower than driving around it. Granted, very few teams have the brecoflex tread like you do, but if I am looking for a cycler on my alliance, I am looking for agility not power. Just ask anyone on 610. They have gotten 7 cycles in a single match, but that would be really hard to do while pushing.
This is an interesting subject. While I agree with you that evading the defender entirely is often the most efficient way of dealing with defense, it's not always the most effective in the long run.

I'm an avid believer that there are certain instances that require 'volume by force' - with that meaning that regardless of what obstacles are present, the same volume of points must be scored. More often than not, this requires that a robot be built in such a way that allows it to be both nimble and forceful enough to decide where and how to hit the defender*. There have been instances this year where while under heavy defense we were still able to put up a reasonably high amount of points and this was due to some good decision making on our driver's part - specifically knowing when it's faster to evade and knowing when it's faster to 'remove' the defender from his path.

*For those of you having trouble visualizing this: Imagine an instance where there is not a clear path around a defending robot without going completely out of your way. At this point, you come to the realization that the only way to get where you need to go in the time required is to make contact. Knowing that, you can now chose where you want to contact the defending robot, and logically, you want to hit them in such a way that you make them either spin out of your way or move in a direction that isn't in your path. Yes, contacting the defender will slow you down, but overall it is still faster than an alternate path - at least in situations like this.
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Unread 16-04-2013, 19:02
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Re: Defense in Ultimate Ascent

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Originally Posted by thefro526 View Post
*For those of you having trouble visualizing this: Imagine an instance where there is not a clear path around a defending robot without going completely out of your way. At this point, you come to the realization that the only way to get where you need to go in the time required is to make contact. Knowing that, you can now chose where you want to contact the defending robot, and logically, you want to hit them in such a way that you make them either spin out of your way or move in a direction that isn't in your path. Yes, contacting the defender will slow you down, but overall it is still faster than an alternate path - at least in situations like this.
And by that point in time the match is over. In the time it took you to come to that conclusion, it would have been faster to go around.
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Unread 16-04-2013, 19:07
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Re: Defense in Ultimate Ascent

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Originally Posted by Abhishek R View Post
Right, inside tip is that when a top offensive bot's coach says "Back to the feeder station" that actually means do a pirouette, a couple of evasive maneuvers, then magically climb and dump for 50.

Just kidding, but there's nothing new about that strategy. Those are really the only 3 'lanes' any bot can actually take. Either push through the direct route to the feeder, go all the way around the pyramid, or go under the opposing pyramid (though this option is usually closed to the taller bots.).
As a drive coach, I would add doing an Ollie off the bottom rung of the pyramid on the way up and then dumping with a glitter cannon that shoots the frisbees out gloriously all while doing jazz hands lol

Seriously, though, being able to go under pyramids is a big advantage, but defending against tall robots has also been tough because at one event we were told that if we (a defensive robot) pushed an opponent into our own pyramid, we would be called for a foul.
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Unread 16-04-2013, 19:20
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Re: Defense in Ultimate Ascent

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Originally Posted by Gregor View Post
And by that point in time the match is over. In the time it took you to come to that conclusion, it would have been faster to go around.
Well, maybe it takes two minutes to type all those words, but these kind of decisions can be made instantaneously in the drive box by experienced drivers or coaches. In the case of the coach, all the thinking can be done internally, but the command can be as simple as "go to the left" or "hit the right corner and push through".

The crazy micro-plays that are come up with in a moment's notice are some of the coolest bits of quick decision making in FIRST. I love looking for them in match videos.
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Unread 16-04-2013, 19:24
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Re: Defense in Ultimate Ascent

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Originally Posted by thefro526 View Post

*For those of you having trouble visualizing this: Imagine an instance where there is not a clear path around a defending robot without going completely out of your way. At this point, you come to the realization that the only way to get where you need to go in the time required is to make contact. Knowing that, you can now chose where you want to contact the defending robot, and logically, you want to hit them in such a way that you make them either spin out of your way or move in a direction that isn't in your path. Yes, contacting the defender will slow you down, but overall it is still faster than an alternate path - at least in situations like this.
Dustin brings up a great point. Often times, it is possible to ram through defence. If you are driving full speed, and hit someones corner, they are likely to get spun out of the way.

There are many types of contact strategies, some better than others.

IMO, the best ones are the ones that can be executed quickly, since the goal is to save time. That usually means spinning and dodging instead of downshifting and pushing.

It all depends on the situation though.
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