Overview/Gameplan
What we are going to try and do in the games when we are going for bio is of course to win (just like any other strategy). How do we accomplish this? Our gameplan should be to keep one thing in mind: Aggression. We cannot sit back and relax and expect to win with bio. Multi-pronged attacks are key. Dropping in several places at once while attacking the front. So to sum it up: constantly pressuring and picking off buildings or tanks, and dropping.
Build order
There are a few builds you can do when going for Bio. The "best" in my opinion are the Gasless FE, and the Reaper FE. Here is the build for the Reaper FE:
10 - SD
12 - Barracks
13 - Gas
15 - Orbital Command
-Marine-
16 - SD
After 1 marine, techlab on the barracks and a Reaper
When the reaper is finished research stim (to fend off early allins) -when done keep on with concussive shells and shields- and build marauders and marines from the barracks
@400 - CC
@300 - 2 more barracks, keep them "naked" (without addons) in the early game for quick units to hold off early pressure and allins. Later on get a reactor and a techlab
Get a factory and second gas at the same time.
@100% Fact - Reactor + Starport (switch later for medivacs)
2 more barracks.
From there on just go with the flow of the game and add on stuff as you go along.Get your 3rd base at around 11-13 mins.
Get double engi bay too for upgrades.
The gasless FE is almost the same thing, but without gas (obv.). Get double gas when the CC is around 60% finished.
Add on tanks later on.
Execution
Move out with a few marines and marauders. Keep in mind that marines and marauders are best in small squads. Attack him and try to make him pull off scv's from the mineral line if he is expanding, to hurt is economy. If he isn't expanding, just keep the pressure there and don't overextend yourself. Try to see if he is going for BF or Banshees, or just a Tank contain and respond properly (explained later).
When your medivacs are out in pair, scan his natural. If you see him sieged up, and with his entire army there, fill both medivacs and drop his main. If you can, save a scan to scan his natural when you have dropped to see when he is unsieging and moving his army (when it's time for you to leave). Try to pick off any reactors or techlabs on factories. If you see him researching anything on techlabs, focus them down. If you can, pick off a factory (not always possible). Do not try to do extreme amounts of damage, instead focus on getting out with minimal losses.
Keep on dropping from time to time at different places. As the armies grow bigger and the players get their 3rd bases up, drop in his main while attacking his 3rd expo. When he moves his army; attack the front. If you see him turtling with tanks at all places and very well defended, dont press your luck. But try your best to make small attacks and drops happen.
Also remember to army trade your opponent as much as possible. You 80% of the time can't beat a mech army straight up. So army trade in the early and mid game as much as possible, you will almost always have the better end since the bio player can reproduce quicker. Also if you can't beat his army and are about to lose, do it MKP style and base trade.
Scouting and responding
Depending on what you scout (scouting is crucual) you have to respond in different ways. More scenarios will be added if I come accross new ways.
Marine Tank
If you scout marine tank (reactor barracks, siege tanks and the standard terran base), continue as usual. What do I mean by this? Well if you scout marine tank, then everything should go smooth if you go for marine marauder and drop. Just abuse his immobility with his tanks, and try to separate them from the marines and pick them off. Continue with the same plan as mentioned before in the guide.
Mech
If you scout mech (several factories with techlabs and hellions), you have to change your plan just slightly. First of all, get a sensor tower around your bases to scout for drops, since BF drops are very common when someone is going for mech. Focus your producition or marauders, and have about 65-70% marauders and 30-35% marines. But here's the fun part against mech: you can drop like there is no tomorrow and get away with it. This is when you really really have to exploit the mobility of your bio army and try to have him moving around. You want to avoid having him cutting the map in half and turtling up.
Air Terran
Against air, you have to change your gameplan drastically. If they go for mass viking banshee into battlecruiser, it's going to be almost impossible to stop with only marines as anti-air. First of all, get turrets up in the mineral lines against banshees. Then get 1-2 more starports (depending on how many he has) and try to have 1 more starport than him. Cut medivac production and produce mass vikings. When you notice that you have more vikings than him, if you can just go and kill him, make some medivacs, but continue viking production at all time. Air terran can make it harder to drop, but still try to drop. It is not as important though as you can fight air terran straight up with viking advantage.
Banshee's (Cloak)
If you through pressure or scan (which should be at around the 6 min mark) scout banshees, fall back if you are in the middle of the map and keep marines home. If you see that the techlab is reasearching cloak, you have 2 choices. Either get an engi bay and turrets (1 in each mineral line), or save scans. This all depends on how confident you are on you marine micro. I usually get turrets when I know I'm going up against a higher level opponent because of how good the banshee harass can be. When banshees are dead, continue as normal.
BF Drop
If you through pressure or scan scout a BF drop incoming (usually a 111 build with no tanks and research on factory) keep 4-5 marauders in your mineral line. You can get some marines at the edge of the base to maybe snipe the medivac as it is coming in. Keep some marauders in your mineral line throughout the game so you don't get caught with your pants down. You can also try to semi-allin push and mass pressure because he won't have any tanks out and you might just win the game if you have lots of marauders.
Maps
Bio works on all maps. Try to avoid maps with big ramps going up and down, since they favour mech and tanks (Crossfire SE style)
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