Connect 4 Position Solver

Engine-evaluated verdicts for 172 of the most-studied Connect Four positions. Every page shows the perfect move, the alternatives, and a "Play from this position" link.

Most Common Openings

The depth-2 positions you reach most often in casual and online play. Click any to see the engine's full evaluation and best continuation.

4-4

P1 wins (eval +1)

4-3

P1 wins (eval +2)

4-5

P1 wins (eval +2)

4-2

P1 wins (eval +2)

4-6

P1 wins (eval +2)

3-4

Draw with best play

5-4

Draw with best play

Famous Positions

Deep positions referenced in opening theory and puzzle books. These are where intermediate and advanced players spend most of their study time.

4-4-4-4

P1 wins (eval +1)

4-4-3-3

P1 wins (eval +18)

4-4-5-5

P1 wins (eval +18)

4-4-3-4

P1 wins (eval +18)

4-4-5-4

P1 wins (eval +18)

4-3-4-3

P1 wins (eval +5)

4-5-4-5

P1 wins (eval +5)

3-4-4-3

P1 wins (eval +5)

5-4-4-5

P1 wins (eval +5)

Try Any Position

The analyzer evaluates any legal position you reach, not just the ones with permanent landing pages. Drop pieces, see the eval update live, share the position with a link.

Frequently Asked Questions

What does the position solver do?

It tells you the perfect-play verdict — win, lose, or draw — for any Connect 4 position, plus the best move and the engine's top alternatives. Every page on this index was evaluated by the play4row solver.

How are positions encoded in the URL?

Each position is a hyphen-separated list of column moves played in order. For example, /solver/position/4-4-3 means Player 1 dropped in column 4, then Player 2 in column 4, then Player 1 in column 3. Player 2 is to move next.

Are these evaluations exact?

Yes for opening-book positions (engineType "opening") and perfect-solver positions ("perfect"). Heuristic evaluations are clearly labelled. Most positions on this index resolve to opening-book hits because they are within the first 6-8 plies.

Can I add a custom position?

Open the analyzer at /analyze and play out any position you like — the engine evaluates every move you make in real time. The position solver index is for permanent SEO landing pages over the most-studied positions; the analyzer covers everything else.