The case of a PEG-1 is important, because almost half of all games pass through that state. Maven can play out such states exhaustively in almost all cases. That is, for all legal moves Maven can play out the resulting endgames (up to 8 for each legal move), and calculate which side will win the game in each case. Because there are some situations (e.g., two blanks, stuck-with-Q) that require extra effort, the calculation is performed progressively. That is, Maven expands its analysis first where the decision is close and relevant.