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"The words best defense, best move, strongest move make me afraid. Oh, I say them myself. But do you notice how often the strongest move is only the strongest move today, and considerably weaker tomorrow?" - Mikhail Chigorin

The Open Encyclopedia of Chess Openings (OECO) is a place where chess enthusiasts, armed only with a passion for chess and chess software, can post their own analysis of chess openings.

The OECO began as a research project in early 2004. In 2008 the project made its public debut with the publication of The Final Theory of Chess. The following year the OECO project launched the current public wiki in order to allow any member of the chess community to participate in this work.

In a nutshell, the OECO 1) facilitates an advanced chess peer-review process; and 2) provides a repository for the accumulation of knowledge of concrete opening analysis. Someone can post computer analysis of a variation and others can either build upon the existing analysis or put forth analysis in support of a different move order.

Consult the User's Guide for information on using the wiki software.


Getting started

Essays & Articles


To establish a user log-in or for further information:

Please write an email with "OECO" in the subject line to:

Note:Phillidor, as in François-André Danican Philidor, is correctly spelled with only one 'l', unlike the email address above.
What is the significance of 5949?

Length of Game, p.182 Hooper, David & Whyld, Kenneth (1987). The Oxford Companion to Chess. Oxford University Press. ISBN 0-19-281986-0
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