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< Sid Meier's Alpha Centauri
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Hello fair players. I'd like to share strategical tips to help you win on hardest difficulty by your skills and intellect only without cheating or save/reload. I personally play on "iron man" and never reload game if I made a mistake. Such unforgiving environment keeps me concentrated to the end of the game and forces me to make better decisions all the time.

These tips helps you to become world dominating power. After you reach this point you can do whatever you desire and don't need these tips anymore since you are practically won the game anyway.

Factions contacts

  • Make pact with other players if possible and exchange maps. This uncovers planet surface early on saving you on exploration and feeding your intelligence.
  • Pact factions gives you connection to other factions for free. This is a nice bonus. If you cannot make a pact with the faction buy connection to other factions anyway. It's cheap.
  • Pact factions also automatically share their map with you every time you contact them. So if you have pact with some faction, share all other faction contacts you have with them. Often they immediately exchange maps behind the scene. Close diplomacy dialog with you pact faction and open it again. They will offer you new map for price - refuse it. Maps will be shared automatically anyway for free.
  • Try not to share faction contacts with others if you are not a potential planetary governor nominee. Otherwise, if somebody gets all contacts they call election and somebody else will become a governor. Which is slight disadvantage for you.

Peace/War balance

Conquering enemy bases and territory with resources is good but spending your resources on building units is bad. Therefore, weight your options on how effective war would be for you at the moment. Successful war bumps your development whereas unsuccessful one throws you into abyss. Besides, conquering other factions is not always good thing. First, your empire stretches and bureaucracy increase impacts all of your cities including already well developed ones. Second, computer has development advantage. So it may be beneficial to evolve togher with friendly factions thus boosting technology research and commerce to achieve transcendence victory quickly.

Maintain good relationships and integrity as long as possible

Other factions are pretty aggressive. They become even more aggressive as game progresses. They become even more aggressive when you break your promises (lower your integrity). They become even more aggressive if you become more powerful. That means when as you grow your power they all start harassing and attacking you. You'll be dead long before the time of your supremacy. Therefore, maintain good relationships with as most of them as possible for as long as possible through the course of the game. You will be definitely fighting somebody from time to time but better one at a time than all of them at once.

Gather intelligence and analyze neighbors

You need to know your opponents to make right decision.

  • Survey territory both land and sea and find out other faction placement and borders.
  • Infiltrate their network. That gives you HUGE intelligence!
  • Study their social choice, agenda and personality.

General peace/war decision points

The most important consideration here is that faction you attack will hold grudge and will try to retaliate whenever possible. They will never make pact with you again, will block your council proposals, and will gladly ally with your enemies. Weight your decision.

  • Research and review all factions around the globe periodically. Try to predict their next move based on existing alliances and mood change. Usually you'll get clear pointers that they are ready to have at you when they demand money/technology.
  • Prepare for future war(s). Do not let others to declare war to you on their terms. Get ready for the right moment and drive the events. Pacify angry factions until you are ready to confront them. Then it is easy to piss them off by constantly demanding to remove their forces from your borders.
  • Compare your military strength. Start war only if you are either able to conquer their empire completely or scare them enough to make truce and block their potential future retaliation. Do not start the invasion if they are able to stop it and counterattack. This will be the end of your career as you'll get a mortal enemy for the rest of the game.
  • If your military strength is not yet enough to invade but the war is inevitable - prepare for defense. This is better from political point of view as you can get sympathy and help from other factions. Building impenetrable defense is cheaper. So you can continue to develop economically while draining enemy resources and preparing retaliation. See more detailed notes on defense tactics below.

Specific peace/war decision cases

Very early in the game

At the beginning you don't have much intelligence about your opponents to base your decision on. It is a matter of insight and judgement. Use below pointers.

  • One side has obvious military superiority.
    • They have Synthmetal Armor or better and you don't have Orge or worms. Make peace and pact by all means as they are unbeatable by you at the moment anyway.
    • You have Orge or worms in quantities enough to take at least two of their cities. Aid them with 1-2 scouts, concentrate your forces on their base and attack.
  • Otherwise.
    • They are pretty far away and do not immediately block your early expansion. Like their closes base is ~20 squares away or your have other direction to expand. Make a peace and pact if possible, exchange maps, save on exploration.
    • They are close and immediately block your early expansion. Like you have nowhere else to go or they are claiming the only useful landmark nearby. Don't make a peace, build as much scouts as you can support and send them to their direction. Find their cities and attack if they are indeed undesirably placed. Otherwise, you can make peace and send your scouts to exploration.

Later in the game

  • Conquer adjacent factions to expand. Try not to fight adjacent factions without explicit benefit, though.
  • Fight far factions with your ally hands to weaken both enemies and allies.

Defence tactics

Your best defence tactics is an active defence. Concentracte defending army in area where you expect massive number of enemy attacker. Your goal is to effectively wipe off attackers approaching your cities turn after turn erroding opponent's army but preserving and building up your own until such time when you are strong enough to launch couterinvasion or just keep them at bay forever. For that you need to have defensive facilities (perimeter defence, naval yard, aerospace complex) plus adequate number of guarrizon units protecting your cities. The goal of your guarrizon is stop or slow down fast enemy attackers and preserve your own fast attacker for retaliation. The best scenario is to let them come right to the city. This way your counterattacker don't need to leave the city at all while attacking. However, it is fine to get one square out of the city for counterattack if you can return your unit safely back next turn. This requires good coordination of building and mixing different unit types. However, once you achieved perfect mix, you'll get economical upper hand. Here is the checklist.

  • Select vulnerable cities depending on enemy units reach (land: borders, air: 10 squares from enemy bases, sea: all).
  • Build defensive facilities in vulnerable cities (land: Perimeter Defense, sea: Naval Yard, air: Airospace Complex).
  • Put best armored defenders with suitable enhancements (land: ECM, air: AAA, worms: empath) in your vulnerable cities in numbers enough to stop or absorb two attack waves. Not that you want them to die but you want to have some cusion of protection for your conterattackers.
  • Put any number of fast attackers (the more the merrier) to actually knock out enemy units: rovers or needlejets if you have them. If opponent has air, add some number of anti-air units.
  • Important! Keep at least one probe team in each borderline base in case enemy probe team get lucky to the city.
  • For land only combats, clean terrain in front of the city. Do not leave any defensive terrain enemy unit can step on. Also remove all roads to slow them down.

Diplomacy

Make peace and pact with everybody you can at the beginning. This will allow you to easily control the cituation later on. When AI fight other faction it tend to throw all resources to the war delaying own development and, most importantly, not starting secret projects leaving you more time to build them for yourself. So your strategy should be 1) to involve every faction into war and 2) direct their aggression to prevent unlimited growth of one AI faction. Here are few scenarios.

  • If you find the rather powerful faction that is weaker than combined power of other factions of its neighbors, make them fight with this strong faction together. Don't let them fight between each other. Even better if you can declare war to the common enemy too. This way they will grow to like you more and you'll secure pacts with them in time. Having pacts with all but one faction helps to support status quo longer and gain valuable time for your development.
  • However, if this powerful faction is not limited by its neighbors, don't let it fight them! Otherwise, it will just grow stronger by conquering them one by one. The better way would be to ally with such faction and declare war to some other out of reach faction. Faction on the other continent or Pirates are perfect choice. This way the development of your potentially strong faction will be impeded by war but it won't be able to conquer your mutual enemy. Thus their whole army potential will go to waste.

Economical growth

Should AI play as good as player in all areas it would be almost impossible to beat it on hardest level since it has 70% production bonus. It has one major flaw, though. Terraforming. Properly used condencers, boreholes, and mirrors boost your city parameters (growth, production, energy) 2-4 times comparing to undevelopped city. AI doesn't do it. So, as soon as you acquire technologies, build 2-3 formers per city and start terraforming like crazy. Your completely terraformed cities will produce technolgies twice as fast comparing to underdevelopped AI emprire of equal size. That is your game turning point. You need time of undisturbed development to get there, though. That's why you need to master war and diplomacy.

Terraforming hints

  • River is a pure bonus. No ecological damage too! Drill as much rivers as you can.
  • Place mirrors and collectors in straight interlacing lines (line of mirrors, line of collectors, etc.). This gives you +3 energy per mirror/collector tile on average - best configuration possible.