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#1
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Defensive Robots/Strategies?
Considering the shuttling and the importance of cycle times in this year's game, how effective would defensive strategies/robots be?
Would it be a better idea to defend against gear or ball scoring robots? What design elements/components would increase a robot's defensive capability? Would a hybrid gear + defensive robot be viable? What would defense this game look like? |
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#2
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Re: Defensive Robots/Strategies?
I think that to be an effective defense bot all that you really have to do is go to the opposing alliance's launch pad and clog up some of the narrower passages between the drive station and the airship. Then there is also of course the ability to severely lengthen your opponent's cycle time just by being in the way and forcing them to adjust their path in the neutral zone. Make sure that you check up on the rules before pursuing any aggressive defensive strategies.
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#3
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Re: Defensive Robots/Strategies?
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I think designing a robot to do both is a good idea, but during an actual match post Auto, it is better to focus on one task or the other. So post Autonomous head to the area between your airship and their feeder station push/pin a robot heading to retrieve a gear till you either are nearing their safe zone or you need to break the pin. Wait for them to retrieve the gear. They will either A)need to go around the air ship to not deal with you or B)try to get by you If A: Go diagonally towards their desired path they will either: 1) Redirect and play chicken, 2) Run into you and now you have a pushing match heading towards your safe zone so they are risking a penalty 3) You pin them for a legal pin If B: Don't let them by turning it into a pushing match or pinning them legally Either they get by you or you spend the entire match shutting them down if it is the latter congratulations, you did your job and will be on someones pick list for effective defense if not. Once they get into the area to score the gear that is not a safe zone, be as disruptive as possible and you will either slow them down or make them drop the gear. Either they score the gear or they don't. If the latter once again congratulations, you did your job and will be on someones pick list for defense if not repeat the steps listed above. If someone is making you waste this much time the whole match than there is no way you are cycling fast enough to engage the rotors by themselves. Last edited by MARS_James : 09-01-2017 at 23:08. |
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#4
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Re: Defensive Robots/Strategies?
The mandatory feature required of all teams attempting to play shutdown defense near the opponent's airship will be a way to solve the visibility challenges presented by the airships.
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#5
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Re: Defensive Robots/Strategies?
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Say Robots A, B, and C are on an alliance. Robots A and B can score a total of five gears. Robot C can place up to three gears and play defense. If A and B place their five gears (plus the free gear), the alliance engages two rotors (80 points). If A, B, and C place their maximum eight gears, the alliance engages three rotors (120 points). However, if A and B place their five gears and C places one gear then plays defense, the alliance still engages three rotors (still 120 points) plus they gain whatever havoc C wreaks on their opponents. Last edited by Brian Maher : 10-01-2017 at 00:34. |
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#6
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Re: Defensive Robots/Strategies?
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#7
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#8
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Re: Defensive Robots/Strategies?
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1) Vertical Defense- Use your robot to block potential fuel shots by choosing to build using the volume option with a focus on height (30 in. by 32 in. by 36 in. tall (~76 cm by 81 cm by 91 cm tall)). This option is difficult to pursue for 2 reasons:
2) Horizontal Defense- Use your robot to effectively pin opponents by selecting the volume option with a focus on width (36 in. by 40 in. by 24 in. tall (~91 cm by 101 cm by 60 cm tall)).
G11.There’s a 5-count on pins. ROBOTS may not pin an opponent’s ROBOT for more than five (5)
G08. Don’t tear others down to lift yourself up. Strategies aimed at the destruction or inhibition of G09. Stay out of other ROBOTS. Initiating deliberate or damaging contact with an opponent ROBOTIn terms of contact, both vertical and horizontal builds should be equally effective, but the width of the horizontal should be more effective for pinning. In regards to height, the distance from the ground to the top of the high efficiency is roughly 27 in. The maximum height for a vertical bot is 36 in. and for a horizontal bot is 24 in. The horizontal bot should semi-effectively block shots into the low efficiency goal, so this is something to consider when picking a strategy. In summary, your most viable option is probably to pursue interfering with ball-shooting robots. They are easier to throw off, as many teams seem to be implementing safeguards against gears falling off. |
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#9
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Re: Defensive Robots/Strategies?
We reviewed some core defensive strategies in our video update of weeks 1 & 2, so we recommend your team checks this out to see how other teams are implementing some of these strategies!
https://youtu.be/PJhMr0CW83s Last edited by SMR Vault : 24-01-2017 at 08:23. |
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#10
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Re: Defensive Robots/Strategies?
The field this year has some semblance to Ultimate Ascent's field, with large field objects creating chokepoints. The chokepoints this year are the two corridors where robots can exit their key.
Optimally played defense will make it extremely difficult for boiler-scoring robots to leave the key after their cycle, as IMO, playing defense on intaking robots is more important than defense on scoring robots, as accuracy matters less than volume of fuel fired. A blue robot shifting between these two positions can significantly disrupt an opponent's cycle time, and even has the potential to entirely lock them out of acquiring new gears or fuel to cycle. http://imgur.com/a/NA1uK |
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#11
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Re: Defensive Robots/Strategies?
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"There is no FIRST® Robotics Competition specific definition of pin, so a general definition applies; “to prevent or stop something from moving.” As a result, contact is not required for pinning to occur. For example, a ROBOT parked right behind an opponent that is between dividers could be considered pinning because the dividers and the parked ROBOT prevent the opponent from moving." So would contacting a robot for a period of longer that a 5 count be allowed assuming both robots were moving? Such as in the case of continued bumping or pushing? |
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#12
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Re: Defensive Robots/Strategies?
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But imagine this scenario: Robot A is moving towards some point on the field to score points. Robot B wants to play defense on them, and so Robot B drives headlong into Robot A to prevent them from scoring. Both robots are in an open area, pushing head to head and neither are moving for over 5 seconds. This is typically not considered a pin. While neither robot is moving, Robot A could, at any time, throw it in reverse and try an alternate route. Robot B is preventing Robot A from getting to their destination via the most direct path. They are not preventing them from moving at all. Now imagine this: Robot A has just scored, has one end against a wall or some other obstacle, and wants to drive back tot he other end of the field to reload whatever scoring piece. Robot B wants to play defense. Robot B does this by driving headlong into Robot A, driving it into the wall. Neither robot is moving for over 5 seconds. This would typically be considered a pin. Robot B is preventing Robot A from moving whatsoever and would be in violation of G11. While that doesn't directly answer your question, you should be able to draw the correct conclusion form that. Last edited by Cothron Theiss : 02-02-2017 at 20:14. |
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#13
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Re: Defensive Robots/Strategies?
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I hope we see a shooter than can put up 40 pts in auton. They'll seed high and should be able to pick a good auton gearbot and another gearbot. That's enough points coming out of auton to win with a pure defense teleop strategy. In a gearbot vs gearbot race, the first alliance to 4 rotors will have to decide to go full defense or shoot. If they get to 4 rotors with a 4 gear lead, it probably makes sense to go full defense. Or put up a point of fuel just to cover the case of a rotor tie before switching to full defense. An auton fuel dump into the low boiler by a gearbot will be valuable for the same reason. If an alliance feels they can win in the climb, it may pay to be very defensive as well because climbs can dominate low point games. Strong defense and good clock management will be very hard to play against though it requires more coordination than alliances can normally execute. It will be fun to watch these matches and see where the meta goes! Best advice this year (as it is most years) is don't skimp on your drivetrain. Speed and reliability are critical to both offense and defense. |
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#14
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Re: Defensive Robots/Strategies?
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#15
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Re: Defensive Robots/Strategies?
An extremely important thing to note about this is that as per G13, "A ROBOT with any part inside its opponent’s RETRIEVAL ZONE may not contact an opposing ROBOT, regardless of who initiates the contact. Violation: TECH FOUL." You can defend against robots that are near the retrieval zone, but be extremely careful about it because tech fouls aren't fun.
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