There is a way to make "Open" challenges. Unfortunately, it is not possible to set parameters, and a few greedy groups gobble up all such challenges. In effect, next to useless.
Let's Play - teams
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You mean like some nasty gigantasaurus like 5 4 fighting could come along and blast me off the board with 5 GMs in their lineup? Anyways where is it on the teamhomepage?
Afterall my Spaceship Troopers are brave young & fearless gun-ho lads not you lot of geriatric stiff upper-lip gents!!
When your team's are down the food chain e.g 150, 100 50 or 25 player-size its hard work finding people who will accept a challenge. In fact its hard work finding compatible teams.
Is there a "let's play" challenge wall where we can pin open invitations for teams like the person v person matches??