Brilliant Move!!AI · Claude 3.5

Core Game Loop and Mechanics

Moment-to-Moment Gameplay:

• Player (white pieces) selects a piece by tapping/clicking it
• Legal moves for that piece are highlighted on the board
• Player taps/clicks a highlighted square to move the piece
• AI (black pieces) calculates and executes its move using Stockfish
• Game continues until checkmate, stalemate, or draw

Progression & Engagement:

• Players improve their chess skills by playing against increasingly difficult AI
• Each game presents unique strategic challenges
• Move history allows players to review and learn from their games
• Visual feedback for checks, captures, and special moves (castling, en passant, promotion)

Win/Lose Conditions:

• Win: Player checkmates the AI
• Lose: AI checkmates the player
• Draw: Stalemate, insufficient material, threefold repetition, or fifty-move rule

Compelling Elements:

• Immediate visual feedback for legal moves reduces cognitive load
• Smooth animations make the game feel polished and professional
• AI thinking indicator creates anticipation
• Move history and game state information help players understand positions

Starting Scope

First Iteration (Implement Now):

• Standard 8×8 chess board with proper square coloring
• All chess pieces rendered as clear, recognizable assets
• Complete chess rules via chess.js (legal moves, castling, en passant, promotion)
• AI opponent using Stockfish at medium difficulty (~depth 10)
• Touch/click piece selection with legal move highlighting
• Automatic pawn promotion to queen (simplest case)
• Check/checkmate/stalemate detection and game-over screen
• New game button to restart
• Move history display (last 5 moves visible)
• Current turn indicator

Future Iterations (Add Later):

• Multiple AI difficulty levels (beginner, intermediate, expert)
• Pawn promotion choice dialog (queen, rook, bishop, knight)
• Full move history with scrolling
• Undo move functionality
• Board flip option (play as black)
• Timer/clock for timed games
• Opening book hints
• Save/load game state
• Sound effects for moves, captures, check

Game Perspective

fixed-screen: Single screen view showing the entire 8×8 chess board. The board should be sized to fit comfortably within the 720×1280 viewport with room for UI elements above and below.

Game World and Level Design

Board Layout:

• 8×8 grid of alternating light and dark squares
• Standard chess starting position (white on bottom, black on top)
• Board centered horizontally in the viewport
• Board positioned in the middle vertical third of the screen

UI Layout (top to bottom):

1. Header Area (top ~200px):

   • Game title "Grandmaster Grid"
   • Current turn indicator ("White's Turn" / "Black's Turn" / "AI Thinking...")
   • Captured pieces display (white captures on left, black captures on right)

2. Board Area (middle ~640px):

   • 8×8 chess board (640×640px)
   • Algebraic notation labels (a-h on bottom, 1-8 on right side)
   • Selected piece highlight (yellow border)
   • Legal move indicators (semi-transparent circles on valid squares)
   • Last move highlight (subtle color on from/to squares)

3. Footer Area (bottom ~440px):

   • Move history panel (scrollable list, last 5 moves visible)
   • Game status message ("Check!", "Checkmate!", "Stalemate", etc.)
   • New Game button (large, centered, 200×60px minimum)

Visual Feedback:

• Selected piece: Yellow border glow
• Legal moves: Green semi-transparent circles
• Last move: Light blue tint on from/to squares
• Check: Red highlight on king in check
• Captured pieces: Small icons displayed in header

Edit Mode Design

Editable Properties:

1. AI Difficulty (dropdown):

   • Beginner (depth 5)
   • Intermediate (depth 10)
   • Expert (depth 15)
   • Default: Intermediate

2. Board Theme (color picker pairs):

   • Light square color (default: #f0d9b5)
   • Dark square color (default: #b58863)
   • Highlight color (default: #baca44)

3. Piece Style (dropdown):

   • Classic (default)
   • Modern
   • Minimalist

4. Auto-Queen Promotion (toggle):

   • Enabled (default): Pawns automatically promote to queen
   • Disabled: Show promotion choice dialog (future feature)

5. Show Coordinates (toggle):

   • Enabled (default): Show a-h and 1-8 labels
   • Disabled: Hide coordinate labels

Constraints:

• AI depth must be between 1-20 (prevent excessive computation)
• Colors must have sufficient contrast for accessibility
• At least one piece style must be selected

Control Design

This is a turn-based puzzle/strategy game with a fixed-screen perspective.

Mobile (Touch):

• Tap piece: Select piece (if it's player's turn and piece has legal moves)
• Tap highlighted square: Move selected piece to that square
• Tap elsewhere: Deselect piece
• Tap "New Game" button: Reset board to starting position

Desktop (Mouse + Keyboard):

• Click piece: Select piece (if it's player's turn and piece has legal moves)
• Click highlighted square: Move selected piece to that square
• Click elsewhere: Deselect piece
• Click "New Game" button: Reset board to starting position
• Keyboard shortcuts (optional for future):
  • N: New game
  • U: Undo move (future feature)

Control Flow:

1. Player taps/clicks their piece → piece selected, legal moves highlighted
2. Player taps/clicks legal move square → move executed, AI turn begins
3. AI calculates move (show "AI Thinking..." indicator)
4. AI move executes automatically → player's turn begins
5. Repeat until game over

Input Handling:

• Disable all board interactions during AI's turn
• Prevent selecting opponent's pieces
• Prevent selecting pieces with no legal moves
• Clear selection when clicking empty squares or invalid targets

Art Style and Visual Theme

Overall Style: Clean, modern chess aesthetic with professional polish. Think chess.com or lichess.org quality.

Color Palette:

• Light squares: Warm beige (#f0d9b5)
• Dark squares: Rich brown (#b58863)
• Highlights: Soft yellow-green (#baca44)
• UI background: Dark gray (#312e2b)
• Text: White (#ffffff) on dark backgrounds
• Accents: Gold (#d4af37) for premium feel

Visual Consistency:

• All chess pieces should be rendered in a consistent classical style
• Pieces should be clear and recognizable at board scale
• White pieces: Light cream color with subtle shading
• Black pieces: Dark charcoal with subtle highlights
• Pieces should cast subtle shadows on the board
• Viewing angle: Straight top-down (2D)

Asset Sizes:

• Board: 640×640px (80px per square)
• Pieces: 70×70px (fit within 80px squares with padding)
• UI buttons: Minimum 200×60px for touch targets
• Icons: 32×32px for captured pieces display

Rendering Strategy:

• Board squares: Render with CSS/Canvas (simple alternating colors)
• Coordinate labels: Render with CSS text
• Chess pieces: Generate as image assets (complex shapes, need detail)
• UI elements: CSS for buttons, panels, text
• Highlights/indicators: CSS with semi-transparent overlays