CE-Chess Tournament: Participation.
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<a href="https://en.wikipedia.org/wiki/Real-time_game#Real-time" target="_blank" rel="nofollow noopener noreferrer">Real Time Game Real Time</a>
<a href="https://en.wikipedia.org/wiki/Correspondence_chess" target="_blank" rel="nofollow noopener noreferrer">Correspondence Chess</a>
<a href="https://en.wikipedia.org/wiki/Swiss-system_tournament" target="_blank" rel="nofollow noopener noreferrer">Swiss System Tournament</a>
<a href="https://en.wikipedia.org/wiki/Round-robin_tournament" target="_blank" rel="nofollow noopener noreferrer">Round Robin Tournament</a>
Double-Round Robin : Similar to round-robin but each player would play 2 games with each other, one with white and other with black.
<a href="https://en.wikipedia.org/wiki/Single-elimination_tournament" target="_blank" rel="nofollow noopener noreferrer">Single Elimination Tournament</a>