private static void Solve(Grid grid, ISolver[] solvers, bool useBruteForceFallback)
{
var unsolvedSquares = 81;
var retryCount = 0;
// Whilst having an effect on the grid i.e. solving at least one square each iteration
// - not checking for the effect of removing possibilities so give it a retry
while (retryCount < 2)
{
while (grid.UnsolvedSquareCount > 0 && grid.UnsolvedSquareCount < unsolvedSquares)
{
unsolvedSquares = grid.UnsolvedSquareCount;
foreach (var solver in solvers)
{
solver.Solve(grid);
grid.Tidy();
}
}
retryCount++;
}
if (grid.IsSolved) return;
if (!useBruteForceFallback) return;
var bruteForceSolver = new BruteForceSolver();
bruteForceSolver.Solve(grid);
}
