End game?

Puzzle collection index

Beta (East) to play

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Beta can survive the current threat.

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Alpha
Beta
1...
sacrifice y2 Altair
move b3 Altair Beta
move r1 Betelgeuse Alpha
2.
sacrifice y2 Altair
discover r3 Beta r2 Altair
move r3 Altair Alpha

Alpha had to sacrifice his own y2 to retreat to his homeworld. The position is about even.

This position is from a casual game I played (I was Alpha).