private static SudokuBoard Solve(SudokuBoard board, bool willGuess = true)
{
int solveState = 1;
while (true)
{
switch (solveState)
{
case 0:
if (board.Changed == true)
{
if (board.Finished == true)
{
if (board.Guess == true)
{
if (board.SimpleTest() == false)
{
goto case 7;
}
}
return(board);
}
board.Changed = false;
board.ChangedExcluding = false;
if (solveState == 1)
{
solveState++;
}
else
{
solveState = 1;
}
break;
}
else if (solveState > 3 && board.ChangedExcluding == true)
{
if (solveState == 4)
{
board.ChangedExcluding = false;
solveState++;
}
else
{
solveState = 4;
}
break;
}
else
{
solveState++;
break;
}
case 1:
board.SimpleHorisontalExclusion();
goto case 0;
case 2:
board.SimpleVerticalExclusion();
goto case 0;
case 3:
board.SimpleSquareExclusion();
goto case 0;
case 4:
board.ChangedExcluding = false;
board.HorizontalExclusionOnOnlyPositionsThatFit();
goto case 0;
case 5:
board.VerticalExclusionOnOnlyPositionsThatFit();
goto case 0;
case 6:
board.SquareExclusionOnOnlyPositionsThatFit();
goto case 0;
case 7:
if (willGuess)
{
board.MakeGuess();
goto case 0;
}
else
{
goto case 8;
}
case 8:
return(board);
}
}
}