Invite the bot to a channel, then follow its lead.
Invite the gamebot to a channel
Challenge someone
Send in the result
Invite the gamebot
It's easy to join. Create a Slack channel (#pong, #chess, #pool or #tictactoe) and invite the bot (@gamebot) to it.
Challenges a member of your team by sending: @gamebot challenge @opponent
Accept the challenge with: @gamebot accept
Lost the game? Send: @gamebot lost, in a draw both say @gamebot draw
Check your rankings with: @gamebot leaderboard 10 or @gamebot rank.