docs(50-move-rule): 50 move docs

Removed 50 move docs from this repo

modules/core/src/main/scala/de/nowchess/chess/engine/GameEngine.scala

@@ -90,17 +90,19 @@ class GameEngine(
         notifyObservers(event)
 
       case moveInput =>
+        // Try to parse as a move
         Parser.parseMove(moveInput) match
           case None =>
-            notifyObservers(InvalidMoveEvent(
+            val event = InvalidMoveEvent(
-              currentBoard, currentHistory, currentTurn,
+              currentBoard,
+              currentHistory,
+              currentTurn,
               s"Invalid move format '$moveInput'. Use coordinate notation, e.g. e2e4."
-            ))
+            )
-          case Some((from, to)) =>
+            notifyObservers(event)
-            handleParsedMove(from, to, moveInput)
-  }
 
-  private def handleParsedMove(from: Square, to: Square, moveInput: String): Unit =
+          case Some((from, to)) =>
+            // Create a move command with current state snapshot
             val cmd = MoveCommand(
               from = from,
               to = to,
@@ -108,11 +110,14 @@ class GameEngine(
               previousHistory = Some(currentHistory),
               previousTurn = Some(currentTurn)
             )
+
+            // Execute the move through GameController
             GameController.processMove(currentBoard, currentHistory, currentTurn, moveInput) match
               case MoveResult.InvalidFormat(_) | MoveResult.NoPiece | MoveResult.WrongColor | MoveResult.IllegalMove | MoveResult.Quit =>
                 handleFailedMove(moveInput)
 
               case MoveResult.Moved(newBoard, newHistory, captured, newTurn) =>
+                // Move succeeded - store result and execute through invoker
                 val updatedCmd = cmd.copy(moveResult = Some(de.nowchess.chess.command.MoveResult.Successful(newBoard, newHistory, newTurn, captured)))
                 invoker.execute(updatedCmd)
                 updateGameState(newBoard, newHistory, newTurn)
@@ -121,6 +126,7 @@ class GameEngine(
                   notifyObservers(FiftyMoveRuleAvailableEvent(currentBoard, currentHistory, currentTurn))
 
               case MoveResult.MovedInCheck(newBoard, newHistory, captured, newTurn) =>
+                // Move succeeded with check
                 val updatedCmd = cmd.copy(moveResult = Some(de.nowchess.chess.command.MoveResult.Successful(newBoard, newHistory, newTurn, captured)))
                 invoker.execute(updatedCmd)
                 updateGameState(newBoard, newHistory, newTurn)
@@ -130,6 +136,7 @@ class GameEngine(
                   notifyObservers(FiftyMoveRuleAvailableEvent(currentBoard, currentHistory, currentTurn))
 
               case MoveResult.Checkmate(winner) =>
+                // Move resulted in checkmate
                 val updatedCmd = cmd.copy(moveResult = Some(de.nowchess.chess.command.MoveResult.Successful(Board.initial, GameHistory.empty, Color.White, None)))
                 invoker.execute(updatedCmd)
                 currentBoard = Board.initial
@@ -138,6 +145,7 @@ class GameEngine(
                 notifyObservers(CheckmateEvent(currentBoard, currentHistory, currentTurn, winner))
 
               case MoveResult.Stalemate =>
+                // Move resulted in stalemate
                 val updatedCmd = cmd.copy(moveResult = Some(de.nowchess.chess.command.MoveResult.Successful(Board.initial, GameHistory.empty, Color.White, None)))
                 invoker.execute(updatedCmd)
                 currentBoard = Board.initial
@@ -148,6 +156,7 @@ class GameEngine(
               case MoveResult.PromotionRequired(promFrom, promTo, boardBefore, histBefore, _, promotingTurn) =>
                 pendingPromotion = Some(PendingPromotion(promFrom, promTo, boardBefore, histBefore, promotingTurn))
                 notifyObservers(PromotionRequiredEvent(currentBoard, currentHistory, currentTurn, promFrom, promTo))
+  }
 
   /** Undo the last move. */
   def undo(): Unit = synchronized {