Is the Othello analyzer free?

Yes. It is built into the free Othello (Reversi) game and needs no account, no download and no API key. The analysis engine runs entirely in your own browser, so there is nothing to install and no usage limit.

What does the evaluation bar mean?

The bar and label are shown from Black’s point of view (Black moves first in Othello). It fills toward whichever side is ahead and the label reads “Even position”, “Black/White has a slight edge”, “clearly ahead”, or “winning”. Because Othello can swing late — a single move can flip many discs — an early-game read is a guide, not a guarantee.

Why does the best move sometimes give away discs?

That is normal Othello strategy. Having more discs in the middlegame is often bad, because it usually means fewer safe moves later. The analyzer values mobility, corners and stable edges over raw disc count, so its best move may deliberately keep your disc total low.

Can I analyze a specific position?

Yes. Play the moves to reach the position you want to study, then press Analyze. The analyzer always evaluates the position currently on the board, for whichever colour is to move, and highlights the square it recommends.

The analyzer uses a real negamax search with alpha-beta pruning, positional square weights, a mobility term and an exact endgame solver near the end of the game — the same engine as the Hard computer opponent. It plays a strong positional game, though it is not a maximal-strength Othello engine.

Does it work on mobile?

Yes. The Othello game and its analyzer are fully responsive and run in any modern mobile browser, so you can analyze positions on a phone or tablet as well as a desktop.

Othello

How to Analyze an Othello Position

LK Forge · 4 min read · Updated August 2026

You don’t need a separate engine to see who’s ahead in an Othello (Reversi) game. The free LK Forge Othello game has a built-in Analyze button that evaluates any position on the board — it names the best move, highlights it, and shows an evaluation bar for whether Black or White stands better. Everything runs in your browser, so nothing is uploaded. This guide covers how to use it and how to read what it tells you.

Analyze any position in three steps

Open the board. Go to the Othello game. You can analyze at any point — against the computer or mid-game.
Reach the position. Play the moves you want to study. Every legal move is highlighted, so it’s easy to steer toward a particular line.
Press Analyze. The analyzer searches and fills in the result: the evaluation bar and lead label, the best move (highlighted on the board), and how deep it looked.

Reading the evaluation

The analysis panel shows:

Evaluation bar & label — from Black’s side (Black moves first). The bar fills toward whoever is ahead and the label reads Even position, slight edge, clearly ahead, or winning, for Black or White.
Best move — the strongest square, shown in Othello notation (column a–h, row 1–8, such as d3) and highlighted on the board.
Depth & nodes — how many moves ahead it searched and how many positions it examined, so you can see how hard it looked. Near the end of the game it solves the position exactly.

Why the “best” move can look strange

Othello rewards patience. Flipping the most discs early usually leaves you with fewer safe replies later, so a strong engine often plays moves that keep its own disc count low while grabbing mobility, edges and — above all — corners, which can never be flipped back. If the analyzer suggests a move that seems to give discs away, that’s the point: it’s trading a short-term disc lead for long-term control.

What powers it

The analyzer isn’t a lookup or a chatbot — it’s a real Othello engine running client-side: a negamax search with alpha-beta pruning, a positional evaluation using square weights and mobility, and an exact endgame solver once few squares remain. It’s the same engine the Hard computer opponent uses, so its “best move” is genuinely the move it would play.

That’s all there is to it — open the Othello board, reach a position, and press Analyze to see who’s ahead and what to play. For more of the same, the Solvers & Analyzers hub gathers every LK Forge solver and game analyzer in one place.

Open the free Othello game and press Analyze on any position — best move, an evaluation bar and search depth.

Open the Othello Analyzer

Frequently asked questions

Is the Othello analyzer free?: Yes. It is built into the free Othello (Reversi) game and needs no account, no download and no API key. The analysis engine runs entirely in your own browser, so there is nothing to install and no usage limit.
What does the evaluation bar mean?: The bar and label are shown from Black’s point of view (Black moves first in Othello). It fills toward whichever side is ahead and the label reads “Even position”, “Black/White has a slight edge”, “clearly ahead”, or “winning”. Because Othello can swing late — a single move can flip many discs — an early-game read is a guide, not a guarantee.
Why does the best move sometimes give away discs?: That is normal Othello strategy. Having more discs in the middlegame is often bad, because it usually means fewer safe moves later. The analyzer values mobility, corners and stable edges over raw disc count, so its best move may deliberately keep your disc total low.
Can I analyze a specific position?: Yes. Play the moves to reach the position you want to study, then press Analyze. The analyzer always evaluates the position currently on the board, for whichever colour is to move, and highlights the square it recommends.
How strong is it?: The analyzer uses a real negamax search with alpha-beta pruning, positional square weights, a mobility term and an exact endgame solver near the end of the game — the same engine as the Hard computer opponent. It plays a strong positional game, though it is not a maximal-strength Othello engine.
Does it work on mobile?: Yes. The Othello game and its analyzer are fully responsive and run in any modern mobile browser, so you can analyze positions on a phone or tablet as well as a desktop.