If I play Baron Pit do I have to conquer 3 BF to win?

Whether you need to conquer all 3 battlefields to win depends on your Mode of Play and your current Point Total.

1. Understanding the "Final Point" Rule

The requirement to "conquer all battlefields" only applies when you are attempting to score your Final Point (the point that brings you to the Victory Score) via a Conquer action.

According to Rule 466.1.b.2:

• If you are 1 point away from the Victory Score and you score a battlefield by Conquering it, you only win the game if you have scored every battlefield (via either Conquer or Hold) during that same turn.
• If you have not scored every other battlefield that turn, you do not win the game; instead, you draw a card.

2. Does playing Baron Pit change this?

Playing Baron Nashor (which creates the Baron Pit battlefield token) does not inherently change the number of battlefields you need to control to win; it simply adds a new battlefield to the game.

• If you are not at the Final Point: You do not need to conquer all battlefields to win. You simply gain points as you conquer or hold battlefields normally.
• If you are at the Final Point: If you use the Baron Pit to score your final point via a Conquer action, you must have already scored all other battlefields in play during that same turn to trigger the win.

3. Important Nuances

• Holding counts as scoring: If you already hold other battlefields at the start of your turn, those count as "scored" for the turn. If you then conquer the Baron Pit, you may satisfy the requirement to have "scored every battlefield" that turn, allowing you to win.
• Mode of Play:
  • In 1v1, there are only 2 battlefields. Adding the Baron Pit would make 3.
  • In 2v2 (Magma Chamber), there are already 3 battlefields.
  • The specific number of battlefields you must score depends on how many are currently in play in your specific game mode.

Summary: You do not need to conquer 3 battlefields to win in every situation. You only need to score all battlefields in play during the same turn if you are attempting to win the game by Conquering for your final point. If you score your final point by Holding a battlefield at the start of your turn, you do not need to conquer any additional battlefields (Rule 466.1.b.1).