diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d9a4aa9..4d01ebe 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout source
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up .NET 10
         uses: actions/setup-dotnet@v5
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 3d94482..3033e55 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout source
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up .NET 10
         uses: actions/setup-dotnet@v5
@@ -45,7 +45,7 @@ jobs:
 
       - name: Upload test results
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: WinDama-test-results
           path: '**/WinDamaTests.trx'
diff --git a/README.md b/README.md
index 736e2f3..9dc6106 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# WinDama ├تظéشظ€إ Algerian / Spanish Checkers
+# WinDama ├تظéشظ€إ Algerian / Spanish Checkers
 
 [![Build](https://github.com/binarylab2022-del/WinDama/actions/workflows/build.yml/badge.svg?branch=main)](https://github.com/binarylab2022-del/WinDama/actions/workflows/build.yml) [![Tests](https://github.com/binarylab2022-del/WinDama/actions/workflows/tests.yml/badge.svg?branch=main)](https://github.com/binarylab2022-del/WinDama/actions/workflows/tests.yml) ![Test baseline](https://img.shields.io/badge/tests-101%20passed-brightgreen) [![Release](https://img.shields.io/github/v/release/binarylab2022-del/WinDama?include_prereleases)](https://github.com/binarylab2022-del/WinDama/releases) [![License](https://img.shields.io/github/license/binarylab2022-del/WinDama)](LICENSE) ![Platform](https://img.shields.io/badge/platform-Windows%20x64-blue) ![Framework](https://img.shields.io/badge/.NET-10.0-purple)
 
@@ -121,7 +121,7 @@ scripts/           Build and release scripts
 
 ## Build and test
 
-Requirements: Visual Studio 2022 with the .NET desktop workload and .NET 10 SDK.
+Requirements: Visual Studio Community 2026 with the .NET desktop development workload, or the .NET 10 SDK for command-line builds.
 
 ```powershell
 dotnet restore WinDama.sln
diff --git a/WinDama1.0/MainWindow.xaml.cs b/WinDama1.0/MainWindow.xaml.cs
index 7b29b54..9b23021 100644
--- a/WinDama1.0/MainWindow.xaml.cs
+++ b/WinDama1.0/MainWindow.xaml.cs
@@ -39,7 +39,7 @@ public partial class MainWindow : Window
         private int? selectedColumn = null;
         private int? selectedRow = null;
         private readonly List<Move> highlightedLegalMoves = new List<Move>();
-        private Move lastMove = null;
+        private Move? lastMove;
         private const int AiTieBreakTolerance = 0;
         private const int BoardSquareSize = 80;
         private const int BoardOffset = 30;
@@ -142,37 +142,37 @@ private sealed class AppUserSettings
 
         private sealed class UiGameSnapshot
         {
-            public WinDama.Core.GameSnapshot CoreSnapshot { get; set; }
-            public int[,] Board { get; set; }
+            public WinDama.Core.GameSnapshot? CoreSnapshot { get; set; }
+            public int[,] Board { get; set; } = new int[8, 8]; 
             public int CurrentPlayer { get; set; }
-            public Move LastMove { get; set; }
+            public Move? LastMove { get; set; }
             public TimeSpan Player1TimeRemaining { get; set; }
             public TimeSpan Player2TimeRemaining { get; set; }
             public bool IsGameOver { get; set; }
             public AiSearchMode SelectedAiSearchMode { get; set; }
             public GameMode SelectedGameMode { get; set; }
             public int MinimaxDepth { get; set; }
-            public string AiTimePerMoveText { get; set; }
-            public string GameClockMinutesText { get; set; }
-            public string StatusText { get; set; }
-            public string AnalysisSummaryText { get; set; }
-            public string SearchModeText { get; set; }
-            public string SearchDepthText { get; set; }
-            public string SearchNodesText { get; set; }
-            public string SearchEvalText { get; set; }
-            public string SearchBestMoveText { get; set; }
-            public string SearchTimeText { get; set; }
-            public string SearchNodesPerSecondText { get; set; }
-            public string SearchLegalMovesText { get; set; }
-            public string SearchBudgetText { get; set; }
-            public string SearchStatusText { get; set; }
-            public string SearchTranspositionText { get; set; }
-            public string SearchTopMovesText { get; set; }
-            public string SearchPrincipalVariationText { get; set; }
+            public string AiTimePerMoveText { get; set; } = string.Empty;
+            public string GameClockMinutesText { get; set; } = string.Empty;
+            public string StatusText { get; set; } = string.Empty;
+            public string AnalysisSummaryText { get; set; } = string.Empty;
+            public string SearchModeText { get; set; } = string.Empty;
+            public string SearchDepthText { get; set; } = string.Empty;
+            public string SearchNodesText { get; set; } = string.Empty;
+            public string SearchEvalText { get; set; } = string.Empty;
+            public string SearchBestMoveText { get; set; } = string.Empty;
+            public string SearchTimeText { get; set; } = string.Empty;
+            public string SearchNodesPerSecondText { get; set; } = string.Empty;
+            public string SearchLegalMovesText { get; set; } = string.Empty;
+            public string SearchBudgetText { get; set; } = string.Empty;
+            public string SearchStatusText { get; set; } = string.Empty;
+            public string SearchTranspositionText { get; set; } = string.Empty;
+            public string SearchTopMovesText { get; set; } = string.Empty;
+            public string SearchPrincipalVariationText { get; set; } = string.Empty;
             public bool IsBoardEditorMode { get; set; }
             public int EditorSelectedPieceValue { get; set; }
-            public string PositionNameText { get; set; }
-            public string PositionNotesText { get; set; }
+            public string PositionNameText { get; set; } = string.Empty;
+            public string PositionNotesText { get; set; } = string.Empty;
         }
 
         //-----------------------------------------------------------------------
@@ -484,7 +484,7 @@ private void UpdateMinimaxDepth(int newDepth)
             MinimaxDepth = newDepth;
             // Apply any necessary logic based on the updated depth
         }
-        
+
         //-----------------------------------------------------------------------
         private void ChessBoardGrid_MouseDown(object sender, MouseButtonEventArgs e)
         {
@@ -1141,7 +1141,7 @@ private string GetSearchModeLabel(WinDama.Core.SearchMode mode)
 
 
 
-        
+
         //-----------------------------------------------------------------------
         private void ResetGame()
         {
@@ -3331,7 +3331,7 @@ private bool HandleMoveExecution(Move move, int player)
         }
 
         //-----------------------------------------------------------------------
-        private Move CloneMove(Move move)
+        private Move? CloneMove(Move? move)
         {
             if (move == null)
             {
diff --git a/global.json b/global.json
new file mode 100644
index 0000000..333cca1
--- /dev/null
+++ b/global.json
@@ -0,0 +1,6 @@
+{
+  "sdk": {
+    "rollForward": "latestFeature",
+    "version": "10.0.301"
+  }
+}