Turn and Check markers.

Shogi.UI/Pages/Play/GameBoard/GameBoardPresentation.razor

@@ -70,13 +70,13 @@
 						}
 					}
 				</div>
-				<p class="text-center">Opponent Hand</p>
+				<p class="text-center">Opponent's Hand</p>
 			</div>
 
 			<div class="place-self-center">
-				<PlayerName Name="@opponentName" IsTurn="!IsMyTurn" />
+				<PlayerName Name="@opponentName" IsTurn="!IsMyTurn" InCheck="IsOpponentInCheck" />
 				<hr />
-				<PlayerName Name="@userName" IsTurn="IsMyTurn" />
+				<PlayerName Name="@userName" IsTurn="IsMyTurn" InCheck="IsPlayerInCheck" />
 			</div>
 
 			<div class="player-area">
@@ -88,7 +88,7 @@
 				}
 				else
 				{
-					<p class="text-center">Hand</p>
+					<p class="text-center">Your Hand</p>
 					<div class="hand">
 						@if (userHand.Any())
 						{
@@ -124,7 +124,6 @@
 	[Parameter] public EventCallback<string> OnClickTile { get; set; }
 	[Parameter] public EventCallback<Piece> OnClickHand { get; set; }
 	[Parameter] public EventCallback OnClickJoinGame { get; set; }
-	[Parameter] public bool IsMyTurn { get; set; }
 	[Parameter] public bool UseSideboard { get; set; } = true;
 
 	private IReadOnlyCollection<Piece> opponentHand;
@@ -167,9 +166,29 @@
 		}
 	}
 
-	private Func<Task> OnClickTileInternal(string position) => () => OnClickTile.InvokeAsync(position);
+	private bool IsMyTurn => Session?.BoardState.WhoseTurn == Perspective;
 
-	private Func<Task> OnClickHandInternal(Piece piece) => () => OnClickHand.InvokeAsync(piece);
+	private bool IsPlayerInCheck => Session?.BoardState.PlayerInCheck == Perspective;
+
+	private bool IsOpponentInCheck => Session?.BoardState.PlayerInCheck != null && Session.BoardState.PlayerInCheck != Perspective;
+
+	private Func<Task> OnClickTileInternal(string position) => () =>
+	{
+		if (IsMyTurn)
+		{
+			return OnClickTile.InvokeAsync(position);
+		}
+		return Task.CompletedTask;
+	};
+
+	private Func<Task> OnClickHandInternal(Piece piece) => () =>
+	{
+		if (IsMyTurn)
+		{
+			return OnClickHand.InvokeAsync(piece);
+		}
+		return Task.CompletedTask;
+	};
 
 	private Task OnClickJoinGameInternal() => OnClickJoinGame.InvokeAsync();
 }

Shogi.UI/Pages/Play/GameBoard/PlayerName.razor

@@ -1,7 +1,14 @@
 <p style="margin: 0">
 	@if (IsTurn)
 	{
-		<span>*&nbsp;</span>
+		<span class="turn-marker" title="Shows which player is next to move a piece.">Turn</span>
+		<span>&nbsp;</span>
+	}
+
+	@if (InCheck)
+	{
+		<span class="check-marker" title="King is in danger!">Check</span>
+		<span>&nbsp;</span>
 	}
 
 	@if (string.IsNullOrEmpty(Name))
@@ -17,5 +24,6 @@
 
 @code {
 	[Parameter][EditorRequired] public bool IsTurn { get; set; }
+	[Parameter][EditorRequired] public bool InCheck { get; set; }
 	[Parameter][EditorRequired] public string Name { get; set; } = string.Empty;
 }

Shogi.UI/Pages/Play/GameBoard/PlayerName.razor.css

@@ -0,0 +1,17 @@
+.turn-marker {
+	display: inline-block;
+	padding: 3px 8px;
+	background-color: #444;
+	color: beige;
+	font-weight: bold;
+	font-size: 80%;
+}
+
+.check-marker {
+	display: inline-block;
+	padding: 3px 8px;
+	background-color: darkred;
+	color: beige;
+	font-weight: bold;
+	font-size: 80%;
+}

Shogi.UI/Pages/Play/GameBoard/SeatedGameBoard.razor

@@ -10,8 +10,7 @@
 												 OnClickHand="OnClickHand"
 												 OnClickTile="OnClickTile"
 												 SelectedPosition="@selectedBoardPosition"
-												 SelectedPieceFromHand="@selectedPieceFromHand"
-												 IsMyTurn="IsMyTurn" />
+												 SelectedPieceFromHand="@selectedPieceFromHand" />
 
 	@if (showPromotePrompt)
 	{
@@ -33,7 +32,6 @@
 	public WhichPlayer Perspective { get; set; }
 	[Parameter, EditorRequired]
 	public Session Session { get; set; } = default!;
-	private bool IsMyTurn => Session?.BoardState.WhoseTurn == Perspective;
 	private string? selectedBoardPosition;
 	private WhichPiece? selectedPieceFromHand;
 	private bool showPromotePrompt;
@@ -65,7 +63,7 @@
 
 	async Task OnClickTile(string position)
 	{
-		if (!IsMyTurn || showPromotePrompt) return;
+		if (showPromotePrompt) return;
 
 		var pieceAtPosition = Session.BoardState.Board[position];
 		if (selectedBoardPosition == position)
@@ -133,7 +131,7 @@
 
 	void OnClickHand(Piece piece)
 	{
-		if (!IsMyTurn || showPromotePrompt) return;
+		if (showPromotePrompt) return;
 
 		// Prevent selecting from both the hand and the board.
 		selectedBoardPosition = null;