The Best Connect 4 Players in the World — Theorists, Champions, and AI Engines
Connect Four does not have a single world champion. What it has is a small lineage of theorists who solved the game, the AI engines that proved it, and the active online ladders where modern competitive play actually happens. Here is the honest roster.
Compiling a "best Connect 4 players" list is harder than it sounds. The game is solved — a fact established in 1988 — which has shaped the competitive scene very differently from chess or Go. There is no continuously-tracked world title, no professional circuit, and no governing body. What exists instead is a research lineage (the people who proved and refined the solution), an engine ecosystem (the public AIs that carry that proof), and a set of active online ladders where the current strongest humans congregate.
We split the roster into four honest categories below, with full bios, verifiable achievements, and external references where they exist. Where we could not verify a claim, we did not include it.
Theorists
Louis Victor Allis
Author of the first published weak solution of Connect Four (1988)
Era: 1988 – present
Louis Victor Allis is the Dutch computer scientist whose 1988 master's thesis at Vrije Universiteit Amsterdam, "A Knowledge-Based Approach of Connect-Four — The Game is Solved: White Wins", established the first publishe…
James Dow Allen
Independent solver of Connect Four (October 1988)
Era: 1988 – present
James Dow Allen solved Connect Four independently of Allis, publishing his result in October 1988 — about a month before Allis defended his thesis. Allen's approach was a more conventional alpha-beta search with hand-tun…
John Tromp
Counted Connect Four positions; published reference solver and database
Era: 1990s – present
John Tromp is a Dutch computer scientist at CWI Amsterdam who has been a quiet but pivotal figure in Connect Four research since the 1990s. He is the author of the reference Connect Four position counts — the now-standar…
Pascal Pons
Author of connect4.gamesolver.org — the public reference solver
Era: 2017 – present
Pascal Pons is a French software engineer who built and maintains connect4.gamesolver.org, which since 2017 has been the de-facto public reference Connect Four solver. The site is open source (MIT licence on GitHub), run…
Gilles Vandewiele
Researcher on Monte Carlo Tree Search applied to Connect Four
Era: 2017 – present
Gilles Vandewiele is a Belgian researcher (Ghent University / IDLab) who has written extensively on applying modern search techniques — MCTS, UCB-style exploration, and policy-network-guided rollouts — to Connect Four as…
Tournament Players
Howard Wexler & Ned Strongin
Designers of the original Milton Bradley Connect Four (1974)
Era: 1974
Howard Wexler and Ned Strongin are the toy designers credited with the original Connect Four board game, released by Milton Bradley in 1974 (Hasbro acquired Milton Bradley in 1984 and has produced the game ever since). T…
Top Online Ranked Players
The current top of the play4row Glicko-2 ranked ladder
Era: 2024 – present
Connect Four does not have a FIDE-style world title. What it has, in 2026, is a handful of always-on online ladders where the strongest active players self-select to the top: play4row's own Glicko-2 ranked ladder (visibl…
AI Engines
connect4.gamesolver.org
Public reference solver — perfect play, open source
Era: 2017 – present
connect4.gamesolver.org is Pascal Pons's reference Connect Four solver, and for most of the online community it is what people mean when they say "the solver". Drop in any position and the engine returns a per-column sco…
John Tromp's Strong Solver
Reference strong-solver implementation and endgame database
Era: 1990s – present
John Tromp's Connect Four solver and accompanying endgame database is the closest thing to an academic reference implementation. Hosted at https://tromp.github.io/c4/c4.html, it is a strong solver — it can resolve any le…
connect4bot.com
Browser-based Connect Four AI with adjustable difficulty
Era: 2020s
connect4bot.com is a clean browser-based Connect Four engine that lets you play against a tunable AI without an account, downloads, or signups. The site is one of the more polished free Connect Four play-vs-computer page…
play4row Engine
Integrated solver, named-bot opponents, and game-review engine
Era: 2024 – present
The play4row engine is the AI that powers /analyze, the /engine page named-bot opponents (Martin, Elena, Antonio, and the rest), and the move-by-move analysis on /review. It is a bitboard alpha-beta solver with a Zobrist…
Online Community Leaders
papergames.io
Long-running multi-game online community with a Connect Four ladder
Era: 2010s – present
papergames.io is one of the longest-running online homes for Connect Four play. The site hosts a roster of paper-and-pen-style games — Connect Four, Tic Tac Toe, Gomoku, Reversi, and others — with a global ranked ladder,…
play4row Community
Modern Connect Four platform — multiplayer, puzzles, review, ratings
Era: 2024 – present
play4row is a chess.com-style platform built specifically for Connect Four. It bundles a Glicko-2 ranked ladder, casual matchmaking, named-bot opponents at ten difficulty levels, a puzzle library refreshed daily, full ga…
Frequently Asked Questions
Who is the best Connect 4 player in the world?
There is no FIDE-style world champion of Connect Four. The strongest current human players are the names at the top of active online ladders — play4row's Glicko-2 ranked ladder at /leaderboard, papergames.io, and a handful of others. Above about 1800 rating, players have effectively memorised the perfect-play opening and games are decided by middlegame tactics and clock management.
Who solved Connect Four?
Connect Four was solved independently in 1988 by Louis Victor Allis (Vrije Universiteit Amsterdam, knowledge-based proof) and James Dow Allen (search-based proof, published October 1988). Both showed that the first player can force a win when starting in the centre column. John Tromp later constructed the strong-solver databases used as the modern reference.
Is the play4row engine perfect?
At maximum strength, yes — verified against Pascal Pons's connect4.gamesolver.org and John Tromp's reference database. At lower difficulties the engine is intentionally tuned to make weaker moves so casual opponents have a fair game. The named bots on /engine cover the full range from genuine beginner to engine-strength.
Are there professional Connect 4 tournaments?
Not in the way professional chess or Go has them. Connect Four is solved as a game theory question, which limits the appetite for high-stakes formal championships. The competitive scene that exists is online — ranked ladders on play4row and a handful of other sites, plus occasional community tournaments. The play4row tournaments page lists active and upcoming events.
See the current top players live
The play4row Glicko-2 ladder updates after every ranked game. The current top names — and the live rating spread — are always at /leaderboard.
Roster size: 13 entries.