Can three players end up on one battlefield in a free-for-all game, such as by using Ride the Wind during a showdown to move a friendly unit onto a battlefield you don't control?

Ruling: No, three players cannot end up on one battlefield. In multiplayer modes, battlefields with pending combats or combats in progress are invalid destinations for moves by units controlled by players who don't already have permanents at that battlefield.

Sequence:

• First player can move a unit to a battlefield, potentially creating a combat situation
• Once a combat is pending or in progress at that battlefield, it becomes an invalid destination for moves by any third player who doesn't already have permanents there
• Players not involved in the combat can still be invited to take actions that affect that battlefield, but cannot move units there

Nuances:

• In 4-player free-for-all, no invite is needed for players to play actions and reactions on another player's showdown
• The invite mechanic will be removed in general in future versions