no test, just back of script by jules

Qwirkle/QwirkleClassLibrary/Game.cs

@@ -256,7 +256,7 @@ namespace QwirkleClassLibrary
             return true;
         }
 
-        public bool CheckExtendedSurroundingCells(Tile tile, int x, int y, int dx, int dy, Board b)
+        /*        public bool CheckExtendedSurroundingCells(Tile tile, int x, int y, int dx, int dy, Board b)
                 {
                     for (int i = 1; i < 7; i++)
                     {
@@ -287,6 +287,31 @@ namespace QwirkleClassLibrary
                         return true;
                     }
                     return false;
+                }*/
+
+        public bool CheckExtendedSurroundingCells(Tile tile, int x, int y, int dx, int dy, Board b)
+        {
+            for (int i = 1; i < 7; i++)
+            {
+                var extendedCell = b.GetCell(x + i * dx, y + i * dy);
+
+                if (extendedCell?.GetTile == null)
+                {
+                    break;
+                }
+
+                if (extendedCell.GetTile.GetColor != tile.GetColor && extendedCell.GetTile.GetShape != tile.GetShape)
+                {
+                    return false;
+                }
+
+                if (i == 6)
+                {
+                    return false;
+                }
+            }
+
+            return true;
         }
 
         public bool CheckTilesInLine(List<Cell> cells, Board b, int x, int y)
@@ -313,17 +338,12 @@ namespace QwirkleClassLibrary
             return false;
         }
 
-        public bool IsMoveCorrect(Tile t, int x, int y, Board b)
+        /*public bool IsMoveCorrect(Tile t, int x, int y, Board b)
         {
             if (!b.HasOccupiedCase())
             {
-                if (this.PlaceTile(this.GetPlayingPlayer(), t, x, y))
-                {
-                    this.AddCellUsed(this.GetBoard().GetCell(x, y));
-                    OnPlaceTile(new PlaceTileNotifiedEventArgs(t, "Tile correctly placed"));
                     return true;
             }
-            }
 
             var surroundingCells = new List<Cell?>
             {
@@ -364,6 +384,45 @@ namespace QwirkleClassLibrary
             }
             OnPlaceTile(new PlaceTileNotifiedEventArgs(t, "La tuile n'a pu etre placé"));
             return false;
+        } */
+
+        public bool IsMoveCorrect(Tile t, int x, int y, Board b)
+        {
+            if (!b.HasOccupiedCase())
+            {
+                return true;
+            }
+
+            var surroundingCells = new List<Cell?>
+            {
+                b.GetCell(x + 1, y),
+                b.GetCell(x - 1, y),
+                b.GetCell(x, y + 1),
+                b.GetCell(x, y - 1)
+            };
+
+            foreach (var cell in surroundingCells)
+            {
+                if (cell?.GetTile == null)
+                {
+                    continue;
+                }
+
+                if (cell.GetTile.GetColor != t.GetColor && cell.GetTile.GetShape != t.GetShape)
+                {
+                    return false;
+                }
+
+                var dx = cell.GetX - x;
+                var dy = cell.GetY - y;
+
+                if (CheckExtendedSurroundingCells(t, x, y, dx, dy, b) == false)
+                {
+                    return false;
+                }
+            }
+
+            return CheckTilesInLine(this.cellUsed, b, x, y) && surroundingCells.Any(cell => cell?.GetTile != null);
         }
 
         public int GetPlayerScore(Player player, ReadOnlyCollection<Cell> cellsPlayed, Board b)

Qwirkle/QwirkleConsoleApp/Program.cs

@@ -75,16 +75,25 @@ static void AddTile(Game game)
     Write("Enter the y of the cell : ");
     int y = Convert.ToInt32(ReadLine());
 
-/*    if (game.IsMoveCorrect(tile, x, y, game.GetBoard()) == true)
+    if (game.IsMoveCorrect(tile, x, y, game.GetBoard()) == true)
     {
         if (game.PlaceTile(game.GetPlayingPlayer(), tile, x, y) == true)
         {
             WriteLine("ok ! your tile is placed");
+            game.AddCellUsed(game.GetBoard().GetCell(x, y));
+        }
+        else
+        {
+            WriteLine("ERROR : Cell already used");
+        }
+    }
+    else
+    {
+        WriteLine("ERROR : Move not correct");
+    }
 
-    }*/
+    /*    game.IsMoveCorrect(tile, x, y, game.GetBoard());
-
+        game.PlaceTileNotified -= nc.NotificationAddTile;*/
-    game.IsMoveCorrect(tile, x, y, game.GetBoard());
-    game.PlaceTileNotified -= nc.NotificationAddTile;
 }
 
 static void SwapTile(Game game)