public SolveResult DoBacktrackingProof(SudokuGrid grid, TextWriter log)
{
//verbose = false;
solnsFound = 0;
int osc = tsc;
BacktrackingProof(log);
if (solnsFound == 0)
{
return(SolveResult.NoSolutions);
}
if (solnsFound == 1)
{
for (int i = osc; i < sampleSoln.Length; ++i)
{
grid.SelectCandidate(sampleSoln[i]);
}
return(SolveResult.SingleSolution);
}
return(SolveResult.MultipleSolutions);
}