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Curiosities · 2026-04-25

Chess by Mail: The Slow, Deep World of Correspondence Chess

Imagine a single game lasting years, one postcard at a time. For over a century, that was top chess for many.

Before the internet let anyone play instantly, the most dedicated players competed in a format measured not in minutes but in months: correspondence chess, where each move travelled by post and a game could outlast the seasons.

One move at a time, by mail

In correspondence chess, opponents send their moves to each other — historically on postcards — and may take days to reply to each one. A serious game can last well over a year, with players typically allowed something like 30 to 60 days per ten moves. The format has been governed since 1951 by the International Correspondence Chess Federation (ICCF), whose roots reach back to the 1920s.

Slower, but deeper

With days to consider each move — and, traditionally, the freedom to analyze on a board and consult books — correspondence games reach a depth and accuracy over-the-board play rarely matches. They are among the most precisely played games in chess history. The first World Correspondence Championship (1950-1953) was won by the Australian C. J. S. Purdy.

Postal chess faded as email and web servers took over around the turn of the century, but the format lives on online — the same patient, profound game, just faster in transit.

A different kind of chess

Correspondence chess rewards a rarer virtue than quick brilliance: patience. It is chess as a long conversation rather than a duel, and a reminder that the game has always adapted to whatever technology carried it — postcard, email or server.

In short: In correspondence chess, moves travel by mail and a single game can last over a year; governed by the ICCF since 1951, the slow format produces some of the most precise games ever played.

Frequently asked questions

What is correspondence chess?

A form of chess where players exchange moves remotely — traditionally by mail — taking days per move, so a single game can last over a year. It is governed internationally by the ICCF.

How long can a correspondence chess game last?

A high-level game can last well over a year, since players may take many days per move (commonly around 30-60 days per ten moves, not counting transit time).

Why is correspondence chess so accurate?

Because players have days to analyze each move — historically on a board and with reference books — correspondence games reach a depth and precision that fast over-the-board play rarely achieves.

See also

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A curiosity from History's Gambit, where chess meets history. You may cite or describe it with attribution to historysgambit.com.