The Four Horsemen of Blackjack
Roger Baldwin, Wilbert Cantey, Herbert Maisel and James McDermott are known as the Four Horsemen of Aberdeen. They published an accurate blackjack basic strategy in 1956 and the book Playing Blackjack to Win in 1957. Their work was foundational, but it does not make one chart correct for every modern ruleset.
The documented contribution
The Blackjack Hall of Fame credits the four mathematicians with the first accurate published basic strategy. Their 1956 article appeared in the Journal of the American Statistical Association, followed by a book for a wider audience.
They began the analysis while serving at Aberdeen Proving Ground and used desk calculators rather than modern computers. The important achievement was systematic: they evaluated player decisions against a dealer procedure instead of relying on intuition.
Connection to later research
The Hall states that Edward O. Thorp credited their work as an impetus for his research and that they supplied him with data in 1958 before Beat the Dealer appeared in 1962. Credit for later systems should remain separate; influence is not sole authorship.
Recognition
The four were inducted together into the Blackjack Hall of Fame in 2008. The Hall’s book list credits each as a collaborator on Playing Blackjack to Win.
How to use their legacy
- Match basic strategy to the exact decks and rules.
- Distinguish a fixed-composition chart from a card-counting strategy.
- Keep publication date and assumptions with historical results.
- Do not describe a small theoretical edge as guaranteed session profit.
Sources
Further reading
Their method helped replace folklore with calculation; current use still requires current rules.
