added stats

.idea/.idea.uqac-ia-sudoku-csp/.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

uqac-ia-sudoku-csp/Interfaces/ISolver.cs

-namespace uqac_ia_sudoku_csp.Interfaces
+using uqac_ia_sudoku_csp.Solver;
+
+namespace uqac_ia_sudoku_csp.Interfaces
 {
     public interface ISolver
     {
-        bool Resolve(Board board);
+        SolverResult Resolve(Board board);
     }
 }

uqac-ia-sudoku-csp/Program.cs

             var solver = new BacktrackSearch();
             var resolved = solver.Resolve(board);
 
-            if (resolved)
+            if (resolved.Success)
             {
                 Console.WriteLine("Resolved:");
                 board.Print(Console.Out);
             {
                 Console.WriteLine("Not resolved");
             }
+            Console.WriteLine($"{resolved.TryCount} tries");
         }
     }
 }

uqac-ia-sudoku-csp/Solver/BacktrackSearch.cs

             };
         }
 
-        public bool Resolve(Board board)
+        public SolverResult Resolve(Board board)
         {
-            return RecursiveResolve(board);
+            var result = new SolverResult();
+            result.Success = RecursiveResolve(board, result);
+            return result;
         }
 
-        protected bool RecursiveResolve(Board board)
+        protected bool RecursiveResolve(Board board, SolverResult result)
         {
             if (board.IsComplete())
             {
             SelectVariable(board, out x, out y);
             foreach (var value in GetDomainValues(board))
             {
+                ++result.TryCount;
                 board.SetNumber(x, y, value);
                 if (IsConsistent(board, x, y))
                 {
-                    if (RecursiveResolve(board))
+                    if (RecursiveResolve(board, result))
                     {
                         return true;
                     }

uqac-ia-sudoku-csp/Solver/SolverResult.cs

+namespace uqac_ia_sudoku_csp.Solver
+{
+    public class SolverResult
+    {
+        public int TryCount { get; set; }
+
+        public bool Success { get; set; }
+    }
+}