Ten Common OpenFront Mistakes

The mistakes OpenFront players repeat, each with the source-code reason it costs you: slider at 100%, hoarding troops, cities on the border.

SOURCE-VERIFIED · df9114ee Intro Updated 2026-07-30 4 min read

Guides

The short version

Slider at 100% · hoarding troops · cities on the border — the three most common by far
All three come from assuming more is better. All three formulas say the opposite
Losing a fight? Pay 25% and pull out. The other 75% comes home and goes back to work

The three most common mistakes are pushing the slider to 100%, letting troops sit at cap, and building cities on your border. All three come from the same instinct — more is better — and in this game all three formulas run the other way.

Each of the ten below comes with the reason it costs you.

1. Pushing the slider to 100%

Against wilderness on plains, advance speed stops improving past 6,600 troops. Against a player, the loss coefficient bottoms out at 1.67× the defender’s troops.

Troops sent beyond that buy nothing. Worse, an empty homeland loses you growth rate as well.

→ What Attack Ratio Should You Use?

2. Letting troops sit at cap

The growth formula multiplies by (1 − troops / cap). Pressed against the cap, growth converges on zero.

The peak is 42.2% of cap, and the moment the +troops/s readout turns orange is the moment you passed it. No arithmetic — orange means spend.

→ Troop Cap and the 42.2% Rule

3. Building cities on the border

Buildings change hands with the territory. A city on your border is a gift of +250,000 troop cap to whoever takes that tile.

Build inland, with 15 tiles of clearance.

4. Clustering ports together

Trade income is a sigmoid in the distance between ports, and it bends at 300 tiles. A 50-tile lane pays 2,541 gold per ship; a 400-tile lane pays 91,443 gold.

A 125,000-gold port built next to another needs 50 trade ships just to break even. Aim for the 200–400 tile band — that is three to four grid cells on World Normal.

→ Where Should You Build Ports?

5. Stacking ports, then switching to factories

Ports and factories share one counter. Build three ports and your first factory is already at the fourth-building price of 1,000,000 gold.

If a factory economy is the plan, decide your port count first.

6. Packing defense posts close together

They do not stack. The game finds one defender-owned post and applies the multiplier immediately. Two posts within 30 tiles still give exactly ×5.

If you build two, put them more than 30 tiles apart so they cover different stretches.

→ Defense Post Range and Placement

7. Trying to bypass a defense post with boats

Boats do not ignore defense posts. A landing creates an ordinary attack starting at that tile, and the post check only asks whether the tile being taken is within 30 tiles.

Land next to a post and you eat the same ×5 as anyone walking in. A boat’s value is that it lets you pick a coast with no post on it — not that it ignores them.

Look for coastline without the checkerboard pattern.

8. Betraying too early

Alliances expire on their own after 5 minutes, and an expiry is not a betrayal.

Break one yourself and for 30 seconds everyone can hit you at half losses. If expiry is close, waiting costs you nothing at all.

→ What Happens When You Betray an Alliance?

9. Going for nukes in the early or mid game

An atom bomb at 750,000 gold is six cities. With the silo it is 1,750,000 gold — more than ten.

While there is still land to take, gold spent on nukes comes back as being behind on growth. And a SAM takes 30 seconds to build, so starting one after you see a missile inbound is far too late.

→ When to Use Nukes

10. Pouring troops into a fight you are losing

The red ❌ in the event feed cancels an attack in progress. It costs 25%; the other 75% walks home.

Troops are not ammunition, they are a growth asset. Returned troops go back to producing. Paying 25% to keep 75% is usually the right trade.

Nukes cannot be cancelled once launched.

Three easy gains people miss

Not mistakes exactly — just value left on the table.

Attacking a Tribe costs 30% fewer troops. When you are choosing which way to expand, the Tribe label in the player overlay usually gives you the answer by itself.

A full encirclement costs zero troops and hands you all their gold. Wrap a territory so that none of its tiles touch water or the map edge. Early on, look for isolated Tribes.

Traitors take half losses. That window is the 30 seconds their name carries a broken shield. And breaking an alliance with someone who is already a traitor does not mark you.

→ Strategy Names collects these and four more with their numbers.