How many players can participate in a single round of Counter-Strike 1.6?

@matilda 

A single round of Counter-Strike 1.6 can have up to 20 players participating in it. Each team can have a maximum of 10 players, and the game can be played in various modes such as Deathmatch, Classic Casual, Classic Competitive, etc. In each mode, the number of players can vary depending on the server settings and the preferences of the players.