-Fixed game result will omit fivefolds repetition if fifty moves rules is within reach.

-Fixed TypeI AI where some analysis was written incorrently or had neglected some rules, with same ELO, it moves now feel much more smarter than it should have been. The effect only obvious on higher ELO TypeI AI offers.

-Tile indicator will light up red while checking king.

-The tile of selected piece will now become green together with legal moves.

v3.0.3D

-Added 3D chess pieces assets, added option to switch between 2D and 3D.

-Created ChessPieceObject class to handle reference to pieces object for switching pieces model during play mode.

-Draw behaviour is now different depending on AI levels.

v3.0.1

Update for Stockfish to be working with v3.0. Stockfish needed to be imported from github, check the documentation.

v3.0 Super Update

Section 1 : Highlight

-GUI classes will never need to have serialized field for UI, instead UI information has to go through ChessEventManager and ChessEnquiryManager.

ChessEventManager is for executing functions while ChessEnquiryManager is for asking values.

-All variables in ChessGame class had been changed from private to protected.

-Change ChessBoard from struct to class

-Assigned namespace for all scripts, game logic contained in Mechanism namespace extension, all else remained in global namespace scope.

-Created ChessGameBase class, the base of ChessGame, having no chess rules at all, utilized by PlaygroundGUI for a freedom, clean and straight away click and drag play without restriction.

-Inheritence is now used on GUI and chess game logic classes, with the class ChessGameBaseGUI and ChessGameBase as their base.

-Four of the ChessGame class execute moves functions including ExecuteMove and ExecuteFinishCheckingMove return definite type instead of nullable, since such execution assume legal move.

ExecuteLegalCheckingMove and ExecuteLegalAndFinishCheckingMove functions will return null type when move performed is illegal.

-Create a class ChessUndoHistory for undoHistory in ChessGame class instead of using tuples.

-Created TilesEffectManager class responsible for changing tiles color.

-Promotion and Game Result UI is now made as reusable UI, with ChessReusableUIs as the prefab, Promotion UI and Game Result UI will be shown automatically when it suppose to be.

-ChessAITypeI will now clone a separate game state before performing position analysis, mainly to prevent inconsistent playerTurn state.

-Changes one of the ChessGame constructor to receive an additional disambiguating move as parameter.

-Remove playerTurn variable from GUI classes, for retrieving current turn player, using playerTurn variable from ChessGame classes would suffice.

-Added SerializeField for variable that can adjust tile and graveyard spawn position, from attached ChessObjectManager script component.

-Migrate indexes and algebraic notation variables that record state to newly created ChessGameMoveVariant logic class, making the GUI only doing UI work.

-Added boolean parameter considerFinishCheck to associated DisambiguatingMove and AlgebraicNotation functions in ChessGame class, mainly to facilitate puzzle game logic.

-ChessGameInitializeInfo class is being used to record game starting state, making a subclass of it to suit different constructor can make code cleaner, just like the usage of it subclasses, ChessGamePGNInitInfo and ChessGamePuzzleInitInfo.

-Created example scene for each and every feature rich GUI script.

-Added quite a few new test cases for testing features on newly implemented game logic ChessPuzzleEditor, ChessGamePuzzle and ChessGameMoveVariant.

-Added ChessBoard model with texture that fit all combined 64 tiles.

New features

-Flipboard

-User can now select the color they wanted to play before a game started.

-Implemented responsive UI, buttons comes with feedback, whether the event has been successfully executed.

-Introduced graveyard, having able to move pieces into them in sequence while being captured, automatically. Graveyard can be enabled or disabled by the toggle on most attached GUI scripts component.

-Selecting pieces thats not on their turn will display invalid but possible moves as if it's on their turn.

-A separated multitouch scene is implemented for two player mode for mobile only, where two of the player can touch and move their chess piece at the same time without having the non-current turn parties to wait for their opponent.

Face to face players especially the non-current turn party, can now use finger gimmick like intentionally making a move to trick opponent into believing that they wanted to make such move, or when elderly trying to expose their next action as an act of displaying their strength.

-The previous normal AI is now known as TypeI AI. A new TypeII AI is introduced, utilizing depth first search MTD algorithm with ELO between 1000 to 1500, comes with a total of 4 search depth, can be configured for more.

-PGN scene now able to inserting text containing sequence of algebraic notations for visualization, and saved move variants can be deleted.

-Previously, all test cases are run on EditMode. Now, a new PlayMode test for ChessPGN scene is added, for testing each and every matches' algebraic notations contained in PGN text files, if they can be executed without problem, check the comment in PGNGUITests.cs file in PlayMode folder for switching test option, whether to test for all PGN text files in one shot, one specific file(default option) or just one specific match in the file.

It is best to test new and untested PGN text file for at least once, so that all PGN text files are free from error.

-Newly implemented runtime puzzle editor for easy puzzle editing, features including board editing with mouse action, cut move or move variants to their counterpart, instant puzzle editing mode, etc.

Puzzle data is now being saved as scriptable object, mainly taking algebraic notation as its data. The create, load, and update scriptable object button is at attached ChessPuzzleEditorGUI script component.

-Added new draw feature allowing player or AI to offer draw between each other, with AI having its own draw and resign analysis logic, player have the option to accept or decline it when the offer were made.

For each AI level, four different comment can be assigned on ChessAIDrawCommentSO scriptable object for when AI declined draw offer from the player, including the one for early game, while AI having a huge avantage, still eager to continue playing and straight away reject.

Behavioural changed

-When saving move variant in PGN scene, the exact same move sequence cannot be repeatedly saved and move variant will only be recorded if only if it is different from the next move algebraic notation.

-PGN scene can now undo the very first move made, which it was prevented to do so previously.

-For threefold repetition and fifty moves rule, no longer needed to do it manually. Instead, a popup option panel will be shown asking if player wanted to draw by any option available, declining them will not have them shown again until the next game.

Player can also click the draw button to draw by options after declining. It is now able to force automatic draw on threefold repetition and fifty moves rule instead of fivefold repetition or seventyfive moves rule by the forceOptionalDraw SerializedField on GUIs.

-Implemented attack sound effect, separate attack from move sound effect.

-PGN scene game finish result only accept checkmate, stalemate, five fold repetition, seventy-five moves rule and insufficient material condition changed to if any color has empty piece, to accomodate imported PGN where they might have different game finishing rule.

-Renamed folder that contained PGN text files in Resources/PGN folder from GrandMasters to TextFiles.

New PGN text files added into the folder have to be registered in scriptable object ChessPGNGameFilesName.asset in Resources/ScriptableObjects/ChessPGN folder, by the exact text file name. Then a new dropdown option can be added manually to PGNSelectorUI gameobject in ChessPGN scene.

Reworked

-Totally remove singleton pattern and implement subscription and observation pattern.

-Reorganized and reworked on UI, making all of them as components. For this system, one script, derived from BaseUI monobehaviour, should exist between each or a group of UI prefabs.

Any features can be disabled by simply set the UI scene gameobject to inactive to disable its usage before play mode.

-Reworked on chess controller, it is now supporting simultaneous click and drag action. Click or drag to select a piece, click or drag on other pieces while a piece

is selected to switch target piece, click or drag a piece to target destination to perform attack or movement, click on the selected piece again to deselect it.

-Refactored and reworked on ChessGameGUI and renamed it to ChessGameAIGUI, making it inherited from a series of class hierachy.

-Refactored and Reworked on PGN scene.

-Complete reworked on puzzle(now ChessPuzzle scene), making it having the option to handle puzzle variant that can accept multiple chess position as correct answer throughout the whole puzzle level.

The puzzle section is separated into fixed move and move variant, indicated by the right top and right bottom scroll view where the fixed move is just for displaying, maybe for player to know more about the underlying puzzle without having them to guess for themselves.

The puzzle variant which is the answer, provided at the left side of the screen, by clicking the show answer button.

Added quite a few event based methods in ChessBaseGUI class. They can be overriden for any extra event that should be called on top of these event.

-OnChessGameFinished

-OnGameFinishedByEnding

-OnGameFinishedByDrawing

-OnCheckingKing

-OnPieceFinishMoving

-OnPieceFinishAttacking

-OnPromotePiece

-OnControllerActionEnded

Max word. More.

The Coolest Chess