Challenger's Gambit | PuzzledQuant

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A challenger fund decides whether to enter a market dominated by an incumbent. Payoffs are written (Challenger, Incumbent):

The Challenger first chooses Stay Out or Enter. Staying out ends the game at (0, 10).
If the Challenger enters, the Incumbent observes this and chooses Fight or Accommodate. Fighting ends the game at (-4, -2).
If the Incumbent accommodates, the Challenger makes a final choice: Hold for (3, 5) or Expand for (6, 1).

Everyone is rational, cares only about their own payoff, and this is common knowledge. What payoff does the Challenger earn at the subgame-perfect outcome of the game?

A challenger fund decides whether to enter a market dominated by an incumbent. Payoffs are written (Challenger, Incumbent):

The Challenger first chooses Stay Out or Enter. Staying out ends the game at (0, 10).
If the Challenger enters, the Incumbent observes this and chooses Fight or Accommodate. Fighting ends the game at (-4, -2).
If the Incumbent accommodates, the Challenger makes a final choice: Hold for (3, 5) or Expand for (6, 1).

Everyone is rational, cares only about their own payoff, and this is common knowledge. What payoff does the Challenger earn at the subgame-perfect outcome of the game?