private List <GameState> GetFirstStageNextPossibleStates(PlayerNumber playerNumber)
{
PlayerNumber otherPlayerNumber = playerNumber == PlayerNumber.FirstPlayer ? PlayerNumber.SecondPlayer : PlayerNumber.FirstPlayer;
List <GameState> gameStates = new List <GameState>();
List <Field> emptyFields = CurrentBoard.GetEmptyFields();
foreach (var emptyField in emptyFields)
{
GameState nextGameState = PawnPlacingGameStateFromThis(playerNumber, emptyField.FieldIndex);
HashSet <Mill> millDifference = nextGameState.MillDifference(this);
if (millDifference.Count == 0)
{
gameStates.Add(nextGameState);
}
else if (millDifference.Count == 1)
{
List <Field> otherPlayersFields = nextGameState.CurrentBoard.GetPlayerFields(otherPlayerNumber);
foreach (var otherPlayerField in otherPlayersFields)
{
gameStates.Add(nextGameState.PawnRemovalGameStateFromThis(otherPlayerField.FieldIndex));
}
}
else
{
List <Field> otherPlayersFields = nextGameState.CurrentBoard.GetPlayerFields(otherPlayerNumber);
for (int i = 0; i < otherPlayersFields.Count - 1; i++)
{
GameState firstRemovedPawnGameState = nextGameState.PawnRemovalGameStateFromThis(otherPlayersFields[i].FieldIndex);
for (int j = i + 1; j < otherPlayersFields.Count; j++)
{
GameState secondRemovedPawnGameState = firstRemovedPawnGameState.PawnRemovalGameStateFromThis(otherPlayersFields[j].FieldIndex);
}
}
}
}
return(gameStates);
}