updated to use optimized cyython build

src/blokus_gym.egg-info/PKG-INFO

@@ -1,35 +0,0 @@
-Metadata-Version: 2.4
-Name: blokus-gym
-Version: 0.1.0
-Summary: A Gymnasium-compatible RL environment for the board game Blokus, with a playable web UI
-Author: Blokus Gym Contributors
-License: MIT
-Project-URL: Homepage, https://github.com/blokus-gym/blokus-gym
-Project-URL: Documentation, https://github.com/blokus-gym/blokus-gym#readme
-Keywords: reinforcement-learning,gymnasium,blokus,board-game,pettingzoo,flask,game-ui
-Classifier: Development Status :: 3 - Alpha
-Classifier: Intended Audience :: Science/Research
-Classifier: License :: OSI Approved :: MIT License
-Classifier: Programming Language :: Python :: 3
-Classifier: Programming Language :: Python :: 3.10
-Classifier: Programming Language :: Python :: 3.11
-Classifier: Programming Language :: Python :: 3.12
-Classifier: Topic :: Scientific/Engineering :: Artificial Intelligence
-Requires-Python: >=3.10
-Description-Content-Type: text/markdown
-Requires-Dist: numpy>=1.24
-Requires-Dist: gymnasium>=0.29
-Requires-Dist: pettingzoo>=1.26
-Provides-Extra: render
-Requires-Dist: matplotlib>=3.7; extra == "render"
-Provides-Extra: ui
-Requires-Dist: flask>=3.0; extra == "ui"
-Provides-Extra: dev
-Requires-Dist: pytest>=7.4; extra == "dev"
-Requires-Dist: pytest-cov>=4.1; extra == "dev"
-Requires-Dist: black>=23.7; extra == "dev"
-Requires-Dist: ruff>=0.1.0; extra == "dev"
-Requires-Dist: mypy>=1.5; extra == "dev"
-Provides-Extra: train
-Requires-Dist: stable-baselines3>=2.2; extra == "train"
-Requires-Dist: torch>=2.0; extra == "train"

src/blokus_gym.egg-info/SOURCES.txt

@@ -1,30 +0,0 @@
-pyproject.toml
-src/blokus_gym/__init__.py
-src/blokus_gym.egg-info/PKG-INFO
-src/blokus_gym.egg-info/SOURCES.txt
-src/blokus_gym.egg-info/dependency_links.txt
-src/blokus_gym.egg-info/entry_points.txt
-src/blokus_gym.egg-info/requires.txt
-src/blokus_gym.egg-info/top_level.txt
-src/blokus_gym/core/__init__.py
-src/blokus_gym/core/board.py
-src/blokus_gym/core/bots.py
-src/blokus_gym/core/game.py
-src/blokus_gym/core/pieces.py
-src/blokus_gym/envs/__init__.py
-src/blokus_gym/envs/blokus_env.py
-src/blokus_gym/envs/multiagent.py
-src/blokus_gym/utils/__init__.py
-src/blokus_gym/utils/render.py
-src/blokus_gym/wrappers/__init__.py
-src/blokus_gym/wrappers/action_mask.py
-src/blokus_ui/__init__.py
-src/blokus_ui/app.py
-src/blokus_ui/session.py
-src/blokus_ui/store.py
-tests/test_board.py
-tests/test_envs.py
-tests/test_game.py
-tests/test_imports.py
-tests/test_pieces.py
-tests/test_ui.py

src/blokus_gym.egg-info/dependency_links.txt

@@ -1 +0,0 @@
-

src/blokus_gym.egg-info/requires.txt

@@ -1,20 +0,0 @@
-numpy>=1.24
-gymnasium>=0.29
-pettingzoo>=1.26
-
-[dev]
-pytest>=7.4
-pytest-cov>=4.1
-black>=23.7
-ruff>=0.1.0
-mypy>=1.5
-
-[render]
-matplotlib>=3.7
-
-[train]
-stable-baselines3>=2.2
-torch>=2.0
-
-[ui]
-flask>=3.0

src/blokus_gym.egg-info/top_level.txt

@@ -1,2 +0,0 @@
-blokus_gym
-blokus_ui

src/blokus_gym/core/__init__.py

@@ -1,7 +1,24 @@
-from blokus_gym.core.board import Board
+# Try to import Cython version first, fall back to Python
-from blokus_gym.core.bots import Bot, GreedyBot, GreedyCornersBot, MinimaxBot, RandomBot
+try:
-from blokus_gym.core.game import BlokusGame, Move
+    from .blokus_cython import (
-from blokus_gym.core.pieces import (
+        Board,
+        BlokusGame,
+        Move,
+        Piece,
+        PieceOrientation,
+        PieceSet,
+    )
+    # Import STANDARD_PIECES from pieces.py since it's not in Cython
+    from .pieces import STANDARD_PIECES, DUO_PIECES, JUNIOR_PIECES
+    # Import generate_orientations from pieces.py
+    from .pieces import generate_orientations
+    # Import bots from Python since they're not in Cython
+    from .bots import Bot, GreedyBot, GreedyCornersBot, MinimaxBot, RandomBot
+except ImportError:
+    from .board import Board
+    from .bots import Bot, GreedyBot, GreedyCornersBot, MinimaxBot, RandomBot
+    from .game import BlokusGame, Move
+    from .pieces import (
         DUO_PIECES,
         JUNIOR_PIECES,
         STANDARD_PIECES,
@@ -9,7 +26,7 @@ from blokus_gym.core.pieces import (
         PieceOrientation,
         PieceSet,
         generate_orientations,
-)
+    )
 
 __all__ = [
     "Board",

src/blokus_gym/core/blokus_cython.pyx

@@ -0,0 +1,801 @@
+#!/usr/bin/env python3
+# Combined Cython implementation of Blokus game engine
+# Compile with: python setup_cython.py build_ext --inplace
+
+from __future__ import annotations
+
+cimport cython
+from cython cimport bint
+import numpy as np
+cimport numpy as cnp
+
+
+# -------------------------------------------------------------------
+# Board class (Cython-optimized)
+# -------------------------------------------------------------------
+
+cdef class Board:
+    """Cython-optimized Board class with static typing.
+    
+    Key optimizations:
+    - Static typing eliminates Python interpreter overhead
+    - Direct C-level array access instead of Python method calls
+    - Precomputed bounds checking
+    """
+    
+    cdef public int size
+    cdef public cnp.int8_t[:, :] grid
+    cdef public dict _occupied_cache
+    
+    def __init__(self, int size):
+        self.size = size
+        self.grid = np.zeros((size, size), dtype=np.int8)
+        self._occupied_cache = {}
+    
+    def place(self, int player_idx, list squares):
+        """Place a player's piece on the board."""
+        cdef int x, y
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        
+        for x, y in squares:
+            if 0 <= x < size and 0 <= y < size:
+                grid_view[y, x] = player_idx
+        
+        # Update occupied cache incrementally
+        if player_idx in self._occupied_cache:
+            self._occupied_cache[player_idx].update(squares)
+    
+    def clear(self) -> None:
+        """Reset the board to empty."""
+        self.grid.fill(0)
+    
+    def is_empty(self, int x, int y) -> bool:
+        """Check if a cell is empty (C-level fast)."""
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        
+        if 0 <= x < size and 0 <= y < size:
+            return grid_view[y, x] == 0
+        return False
+    
+    def in_bounds(self, int x, int y) -> bool:
+        """Check if coordinates are within the board (C-level fast)."""
+        cdef int size = self.size
+        return 0 <= x < size and 0 <= y < size
+    
+    def has_overlap(self, list squares) -> bool:
+        """Check if any square is already occupied (C-level fast)."""
+        cdef int x, y
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        
+        for x, y in squares:
+            if not (0 <= x < size and 0 <= y < size) or grid_view[y, x] != 0:
+                return True
+        return False
+    
+    cdef bint is_cell_empty(self, int x, int y):
+        """Check if a cell is empty (C-level fast, inlineable)."""
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        
+        return 0 <= x < size and 0 <= y < size and grid_view[y, x] == 0
+    
+    def get_cell(self, int x, int y) -> int:
+        """Get the player index at a cell (0 = empty)."""
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        
+        if 0 <= x < size and 0 <= y < size:
+            return grid_view[y, x]
+        return 0
+    
+    def get_player_squares(self, int player_idx) -> list:
+        """Get all squares occupied by a player."""
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        cdef list result = []
+        cdef int x, y
+        
+        for y in range(size):
+            for x in range(size):
+                if grid_view[y, x] == player_idx:
+                    result.append((x, y))
+        return result
+    
+    def get_player_occupied(self, int player_idx) -> set:
+        """Get all squares occupied by a player as a set."""
+        if player_idx not in self._occupied_cache:
+            self._occupied_cache[player_idx] = set(self.get_player_squares(player_idx))
+        return self._occupied_cache[player_idx]
+    
+    def get_player_corners(self, int player_idx) -> set:
+        """Get all corner cells adjacent to a player's pieces."""
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        cdef set corners = set()
+        cdef list player_squares = self.get_player_squares(player_idx)
+        cdef int x, y, dx, dy, cx, cy
+        
+        for x, y in player_squares:
+            for dx, dy in [(-1, -1), (1, -1), (-1, 1), (1, 1)]:
+                cx, cy = x + dx, y + dy
+                if 0 <= cx < size and 0 <= cy < size and grid_view[cy, cx] == 0:
+                    corners.add((cx, cy))
+        return corners
+    
+    def get_occupied(self) -> set:
+        """Get all occupied cells."""
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        cdef set result = set()
+        cdef int x, y
+        
+        for y in range(size):
+            for x in range(size):
+                if grid_view[y, x] != 0:
+                    result.add((x, y))
+        return result
+    
+    def is_full(self) -> bool:
+        """Check if the board is completely full."""
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        cdef int x, y
+        
+        for y in range(size):
+            for x in range(size):
+                if grid_view[y, x] == 0:
+                    return False
+        return True
+    
+    def coverage(self) -> float:
+        """Get the fraction of the board that is occupied."""
+        cdef cnp.int8_t[:, :] grid_view = self.grid
+        cdef int size = self.size
+        cdef int count = 0
+        cdef int x, y
+        
+        for y in range(size):
+            for x in range(size):
+                if grid_view[y, x] != 0:
+                    count += 1
+        return count / (size * size)
+
+
+# -------------------------------------------------------------------
+# Move and Piece classes
+# -------------------------------------------------------------------
+
+cdef class Move:
+    """A move in the game (piece, orientation, position)."""
+    
+    cdef public int piece_id
+    cdef public int orientation_id
+    cdef public int x
+    cdef public int y
+    
+    def __init__(self, int piece_id, int orientation_id, int x, int y):
+        self.piece_id = piece_id
+        self.orientation_id = orientation_id
+        self.x = x
+        self.y = y
+    
+    def __repr__(self):
+        return f"Move(piece={self.piece_id}, orient={self.orientation_id}, pos=({self.x}, {self.y}))"
+
+
+cdef class PieceOrientation:
+    """A piece in a specific orientation (before placement on board)."""
+    
+    cdef public int piece_id
+    cdef public int orientation_id
+    cdef public list squares
+    cdef public list corners
+    
+    def __init__(self, int piece_id, int orientation_id, list squares, list corners):
+        self.piece_id = piece_id
+        self.orientation_id = orientation_id
+        self.squares = squares
+        self.corners = corners
+
+
+cdef class Piece:
+    """A polyomino piece defined by a set of (x, y) coordinates."""
+    
+    cdef public str name
+    cdef public object squares  # Use object to allow frozenset
+    
+    def __init__(self, str name, object squares):
+        self.name = name
+        self.squares = squares
+    
+    @property
+    def size(self) -> int:
+        return len(self.squares)
+
+
+cdef class PieceSet:
+    """A collection of pieces with pre-computed orientations."""
+    
+    cdef public list pieces
+    cdef public list piece_names
+    cdef public dict piece_id_map
+    cdef public list orientations
+    cdef public int num_orientations
+    
+    def __init__(self, list pieces_list):
+        self.pieces = pieces_list
+        self.piece_names = [p.name for p in pieces_list]
+        self.piece_id_map = {name: i for i, name in enumerate(self.piece_names)}
+        
+        # Pre-compute all orientations for each piece
+        self.orientations = []
+        for piece_id, piece in enumerate(pieces_list):
+            orients = generate_orientations_cython(piece)
+            for orient in orients:
+                orient.piece_id = piece_id
+            self.orientations.append(orients)
+        
+        self.num_orientations = sum(len(o) for o in self.orientations)
+    
+    @property
+    def num_pieces(self) -> int:
+        return len(self.pieces)
+    
+    def get_orientations(self, int piece_id) -> list:
+        return self.orientations[piece_id]
+    
+    def get_piece(self, int piece_id) -> Piece:
+        return self.pieces[piece_id]
+    
+    def get_piece_id(self, str name) -> int:
+        return self.piece_id_map[name]
+
+
+# -------------------------------------------------------------------
+# Pre-computed standard pieces (Cython-optimized)
+# -------------------------------------------------------------------
+
+cdef frozenset _I1_squares = frozenset([(0, 0)])
+cdef frozenset _I2_squares = frozenset([(0, 0), (0, 1)])
+cdef frozenset _I3_squares = frozenset([(0, 0), (0, 1), (0, 2)])
+cdef frozenset _V3_squares = frozenset([(0, 0), (1, 0), (0, 1)])
+cdef frozenset _I4_squares = frozenset([(0, 0), (0, 1), (0, 2), (0, 3)])
+cdef frozenset _L4_squares = frozenset([(0, 0), (0, 1), (0, 2), (1, 0)])
+cdef frozenset _T4_squares = frozenset([(0, 0), (1, 0), (2, 0), (1, 1)])
+cdef frozenset _S4_squares = frozenset([(0, 0), (1, 0), (1, 1), (2, 1)])
+cdef frozenset _O4_squares = frozenset([(0, 0), (1, 0), (0, 1), (1, 1)])
+cdef frozenset _I5_squares = frozenset([(0, 0), (0, 1), (0, 2), (0, 3), (0, 4)])
+cdef frozenset _L5_squares = frozenset([(0, 0), (0, 1), (0, 2), (0, 3), (1, 0)])
+cdef frozenset _Y5_squares = frozenset([(0, 0), (0, 1), (0, 2), (0, 3), (1, 1)])
+cdef frozenset _N5_squares = frozenset([(0, 0), (1, 0), (2, 0), (2, 1), (3, 1)])
+cdef frozenset _T5_squares = frozenset([(0, 0), (1, 0), (2, 0), (1, 1), (1, 2)])
+cdef frozenset _U5_squares = frozenset([(0, 0), (2, 0), (0, 1), (1, 1), (2, 1)])
+cdef frozenset _V5_squares = frozenset([(0, 0), (0, 1), (0, 2), (1, 0), (2, 0)])
+cdef frozenset _W5_squares = frozenset([(0, 0), (0, 1), (1, 0), (1, 1), (2, 0)])
+cdef frozenset _Z5_squares = frozenset([(0, 0), (1, 0), (1, 1), (1, 2), (2, 2)])
+cdef frozenset _F5_squares = frozenset([(0, 0), (1, 0), (1, 1), (2, 1), (1, 2)])
+cdef frozenset _X5_squares = frozenset([(0, 0), (1, 0), (2, 0), (1, 1), (1, -1)])
+cdef frozenset _P5_squares = frozenset([(0, 0), (1, 0), (0, 1), (1, 1), (0, 2)])
+
+cdef Piece _I1 = Piece("I1", _I1_squares)
+cdef Piece _I2 = Piece("I2", _I2_squares)
+cdef Piece _I3 = Piece("I3", _I3_squares)
+cdef Piece _V3 = Piece("V3", _V3_squares)
+cdef Piece _I4 = Piece("I4", _I4_squares)
+cdef Piece _L4 = Piece("L4", _L4_squares)
+cdef Piece _T4 = Piece("T4", _T4_squares)
+cdef Piece _S4 = Piece("S4", _S4_squares)
+cdef Piece _O4 = Piece("O4", _O4_squares)
+cdef Piece _I5 = Piece("I5", _I5_squares)
+cdef Piece _L5 = Piece("L5", _L5_squares)
+cdef Piece _Y5 = Piece("Y5", _Y5_squares)
+cdef Piece _N5 = Piece("N5", _N5_squares)
+cdef Piece _T5 = Piece("T5", _T5_squares)
+cdef Piece _U5 = Piece("U5", _U5_squares)
+cdef Piece _V5 = Piece("V5", _V5_squares)
+cdef Piece _W5 = Piece("W5", _W5_squares)
+cdef Piece _Z5 = Piece("Z5", _Z5_squares)
+cdef Piece _F5 = Piece("F5", _F5_squares)
+cdef Piece _X5 = Piece("X5", _X5_squares)
+cdef Piece _P5 = Piece("P5", _P5_squares)
+
+cdef list STANDARD_PIECES = [
+    _I1, _I2, _I3, _V3, _I4, _L4, _T4, _S4, _O4,
+    _I5, _L5, _Y5, _N5, _T5, _U5, _V5, _W5, _Z5, _F5, _X5, _P5
+]
+
+
+# -------------------------------------------------------------------
+# Orientation generation
+# -------------------------------------------------------------------
+
+cdef list generate_orientations_cython(Piece piece):
+    """Generate all unique orientations of a piece."""
+    cdef set orientations_set = set()
+    cdef list result = []
+    cdef list squares = list(piece.squares)
+    cdef list transformed
+    cdef int i
+    
+    for i in range(4):  # 4 rotations (0, 90, 180, 270 degrees)
+        transformed = rotate_squares_cython(squares, i)
+        normalized = normalize_squares_cython(transformed)
+        key = tuple(normalized)
+        
+        if key not in orientations_set:
+            orientations_set.add(key)
+            corners = compute_corners_cython(normalized)
+            result.append(PieceOrientation(0, i, normalized, corners))
+    
+    return result
+
+
+cdef list rotate_squares_cython(list squares, int rotations):
+    """Rotate squares by 90 * rotations degrees."""
+    cdef list result = []
+    cdef int x, y, i
+    
+    for x, y in squares:
+        for i in range(rotations):
+            x, y = -y, x  # 90 degree rotation
+        result.append((x, y))
+    
+    return result
+
+
+cdef list normalize_squares_cython(list squares):
+    """Normalize squares to start at (0, 0)."""
+    cdef int min_x = min(x for x, _ in squares)
+    cdef int min_y = min(y for _, y in squares)
+    
+    return [(x - min_x, y - min_y) for x, y in squares]
+
+
+cdef list compute_corners_cython(list squares):
+    """Compute corner squares (diagonal neighbors)."""
+    cdef set corners = set()
+    cdef int x, y, dx, dy
+    
+    for x, y in squares:
+        for dx, dy in [(-1, -1), (1, -1), (-1, 1), (1, 1)]:
+            corners.add((x + dx, y + dy))
+    
+    return list(corners)
+
+
+# -------------------------------------------------------------------
+# Player state
+# -------------------------------------------------------------------
+
+cdef class PlayerState:
+    """State for a single player."""
+    
+    cdef public int idx
+    cdef public set available_pieces
+    cdef public set corners
+    cdef public int score
+    cdef public bint has_started
+    cdef public bint can_move
+    
+    def __init__(self):
+        self.idx = -1
+        self.available_pieces = set()
+        self.corners = set()
+        self.score = 0
+        self.has_started = False
+        self.can_move = True
+
+
+# -------------------------------------------------------------------
+# Main Game class
+# -------------------------------------------------------------------
+
+cdef class BlokusGame:
+    """Cython-optimized Blokus game engine."""
+    
+    cdef public int board_size
+    cdef public PieceSet piece_set
+    cdef public int num_players
+    cdef public bint corner_rule
+    cdef public object board
+    cdef public list players
+    cdef public int current_player
+    cdef public int rounds
+    cdef public bint game_over
+    cdef public list _action_moves
+    cdef public dict _move_to_action
+    cdef public list _actions_by_piece
+    cdef public list _starting_corners
+    
+    def __init__(self, int board_size=20, PieceSet pieces=None, int num_players=4, bint corner_rule=True):
+        self.board_size = board_size
+        self.piece_set = pieces or PieceSet(STANDARD_PIECES)
+        self.num_players = num_players
+        self.corner_rule = corner_rule
+        
+        self.board = Board(board_size)
+        self.players = []
+        self.current_player = 0
+        self.rounds = 0
+        self.game_over = False
+        
+        # Pre-compute all possible moves
+        self._action_moves = []
+        self._move_to_action = {}
+        self._generate_action_space()
+        
+        # Pre-compute action indices per piece
+        self._actions_by_piece = []
+        for piece_id in range(self.piece_set.num_pieces):
+            self._actions_by_piece.append([
+                idx for idx, move in enumerate(self._action_moves)
+                if move.piece_id == piece_id
+            ])
+        
+        # Starting corners
+        max_idx = board_size - 1
+        self._starting_corners = [
+            (0, 0),
+            (0, max_idx),
+            (max_idx, 0),
+            (max_idx, max_idx),
+        ]
+        if num_players == 2:
+            self._starting_corners = [(0, 0), (max_idx, max_idx)]
+        elif num_players == 3:
+            self._starting_corners = [(0, 0), (0, max_idx), (max_idx, 0)]
+        
+        # Initialize players
+        for i in range(self.num_players):
+            player = PlayerState()
+            player.idx = i
+            player.available_pieces = set(self.piece_set.piece_names)
+            if self.corner_rule and i < len(self._starting_corners):
+                player.corners = {self._starting_corners[i]}
+            else:
+                player.corners = set()
+            player.score = 0
+            player.has_started = False
+            player.can_move = True
+            self.players.append(player)
+    
+    cdef void _generate_action_space(self):
+        """Pre-compute all possible (piece, orientation, position) moves."""
+        cdef int piece_id, orient_id
+        cdef PieceOrientation orient
+        cdef list squares
+        cdef int max_x, max_y
+        cdef int px, py
+        cdef Move move
+        cdef int action_idx
+        
+        self._action_moves = []
+        self._move_to_action = {}
+        
+        for piece_id in range(self.piece_set.num_pieces):
+            for orient_id, orient in enumerate(self.piece_set.get_orientations(piece_id)):
+                squares = orient.squares
+                max_x = max(x for x, _ in squares)
+                max_y = max(y for _, y in squares)
+                
+                for px in range(self.board_size - max_x):
+                    for py in range(self.board_size - max_y):
+                        move = Move(piece_id, orient_id, px, py)
+                        action_idx = len(self._action_moves)
+                        self._action_moves.append(move)
+                        self._move_to_action[(piece_id, orient_id, px, py)] = action_idx
+    
+    @property
+    def num_actions(self) -> int:
+        return len(self._action_moves)
+    
+    def get_move(self, int action) -> Move:
+        return self._action_moves[action]
+    
+    def get_action(self, Move move) -> int:
+        return self._move_to_action[(move.piece_id, move.orientation_id, move.x, move.y)]
+    
+    def reset(self) -> None:
+        """Reset the game to its initial state."""
+        self.board = Board(self.board_size)
+        self.players = []
+        self.current_player = 0
+        self.rounds = 0
+        self.game_over = False
+        
+        for i in range(self.num_players):
+            player = PlayerState()
+            player.idx = i
+            player.available_pieces = set(self.piece_set.piece_names)
+            if self.corner_rule and i < len(self._starting_corners):
+                player.corners = {self._starting_corners[i]}
+            else:
+                player.corners = set()
+            player.score = 0
+            player.has_started = False
+            player.can_move = True
+            self.players.append(player)
+    
+    cdef list _get_placed_squares(self, Move move):
+        """Get the absolute board coordinates for a move."""
+        cdef PieceOrientation orient = self.piece_set.get_orientations(move.piece_id)[move.orientation_id]
+        cdef list result = []
+        cdef int dx, dy
+        for dx, dy in orient.squares:
+            result.append((move.x + dx, move.y + dy))
+        return result
+    
+    cdef list _get_placed_corners(self, Move move):
+        """Get the absolute corner coordinates for a move."""
+        cdef PieceOrientation orient = self.piece_set.get_orientations(move.piece_id)[move.orientation_id]
+        cdef list result = []
+        cdef int dx, dy
+        for dx, dy in orient.corners:
+            result.append((move.x + dx, move.y + dy))
+        return result
+    
+    cpdef bint valid_move(self, int player_idx, Move move):
+        """Check if a move is valid for the given player."""
+        cdef PlayerState player = self.players[player_idx]
+        cdef Piece piece = self.piece_set.get_piece(move.piece_id)
+        cdef list placed_squares = self._get_placed_squares(move)
+        cdef list placed_corners = self._get_placed_corners(move)
+        cdef int x, y
+        cdef int player_board_idx = player_idx + 1
+        cdef set player_occupied
+        cdef bint result
+        
+        # Rule 1: Check if player has the piece
+        if piece.name not in player.available_pieces:
+            return False
+        
+        # Rule 2: Check bounds (inline for speed)
+        for x, y in placed_squares:
+            if not self.board.in_bounds(x, y):
+                return False
+        
+        # Rule 3: Check overlap
+        if self.board.has_overlap(placed_squares):
+            return False
+        
+        # Rule 6: First move must be in a corner
+        if self.corner_rule and not player.has_started:
+            if len(self.players) <= len(self._starting_corners):
+                start_corner = self._starting_corners[player_idx]
+                if (move.x, move.y) != start_corner:
+                    return False
+        
+        # Rule 5: No edge adjacency with same-color pieces (inline for speed)
+        for x, y in placed_squares:
+            for dx, dy in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
+                if self.board.in_bounds(x + dx, y + dy):
+                    if self.board.get_cell(x + dx, y + dy) == player_board_idx:
+                        return False
+        
+        # Rule 4: Corner rule (must touch same-color at a corner)
+        if player.has_started:
+            player_occupied = self.board.get_player_occupied(player_idx)
+            # Manual any() implementation - Cython doesn't support generator expressions
+            result = False
+            for cx, cy in placed_corners:
+                if self.board.in_bounds(cx, cy) and (cx, cy) in player_occupied:
+                    result = True
+                    break
+            if not result:
+                return False
+        
+        return True
+    
+    cpdef get_valid_actions(self, int player_idx):
+        """Get a boolean mask of valid actions for the given player."""
+        cdef PlayerState player = self.players[player_idx]
+        cdef cnp.ndarray mask = np.zeros(self.num_actions, dtype=bool)
+        cdef list available_piece_ids = []
+        cdef int piece_id, action_idx
+        cdef Move move
+        cdef list placed_corners, placed_squares
+        cdef int x, y, player_board_idx = player_idx + 1
+        cdef set player_occupied
+        cdef bint edge_invalid, result
+        cdef list corners_list
+        cdef int cx, cy
+        
+        # Build available_piece_ids list
+        for name in player.available_pieces:
+            available_piece_ids.append(self.piece_set.get_piece_id(name))
+        
+        if not player.can_move:
+            return mask
+        
+        if not player.has_started or not player.corners:
+            for piece_id in available_piece_ids:
+                for action_idx in self._actions_by_piece[piece_id]:
+                    if self.valid_move(player_idx, self._action_moves[action_idx]):
+                        mask[action_idx] = True
+            return mask
+        
+        # Pre-compute player's occupied squares ONCE
+        player_occupied = self.board.get_player_occupied(player_idx + 1)
+        
+        for piece_id in available_piece_ids:
+            for action_idx in self._actions_by_piece[piece_id]:
+                move = self._action_moves[action_idx]
+                placed_corners = self._get_placed_corners(move)
+                
+                # Early exit: check corner touch (manual any())
+                result = False
+                for cx, cy in placed_corners:
+                    if self.board.in_bounds(cx, cy) and (cx, cy) in player_occupied:
+                        result = True
+                        break
+                if not result:
+                    continue
+                
+                placed_squares = self._get_placed_squares(move)
+                
+                # Check bounds
+                result = True
+                for x, y in placed_squares:
+                    if not self.board.in_bounds(x, y):
+                        result = False
+                        break
+                if not result:
+                    continue
+                
+                # Check overlap
+                if self.board.has_overlap(placed_squares):
+                    continue
+                
+                # Check edge adjacency (inline for speed)
+                edge_invalid = False
+                for x, y in placed_squares:
+                    for dx, dy in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
+                        if self.board.in_bounds(x + dx, y + dy):
+                            if self.board.get_cell(x + dx, y + dy) == player_board_idx:
+                                edge_invalid = True
+                                break
+                    if edge_invalid:
+                        break
+                
+                if not edge_invalid:
+                    mask[action_idx] = True
+        
+        return mask
+    
+    cpdef bint has_valid_moves(self, int player_idx):
+        """Check if a player has any valid moves."""
+        cdef PlayerState player = self.players[player_idx]
+        cdef list available_piece_ids = []
+        cdef int piece_id, action_idx
+        
+        # Build available_piece_ids list
+        for name in player.available_pieces:
+            available_piece_ids.append(self.piece_set.get_piece_id(name))
+        
+        if not player.can_move:
+            return False
+        
+        for piece_id in available_piece_ids:
+            for action_idx in self._actions_by_piece[piece_id]:
+                if self.valid_move(player_idx, self._action_moves[action_idx]):
+                    return True
+        return False
+    
+    def apply_move(self, int player_idx, Move move) -> None:
+        """Apply a move to the game state. Does not validate."""
+        cdef PlayerState player = self.players[player_idx]
+        cdef Piece piece = self.piece_set.get_piece(move.piece_id)
+        cdef list placed_squares = self._get_placed_squares(move)
+        cdef int x, y
+        
+        # Place the piece
+        self.board.place(player_idx + 1, placed_squares)
+        
+        # Update player state
+        player.available_pieces.discard(piece.name)
+        player.score += piece.size
+        
+        # Update corners
+        if not player.has_started:
+            player.has_started = True
+            player.corners = set()
+        
+        # Add new corners
+        cdef list placed_corners = self._get_placed_corners(move)
+        for x, y in placed_corners:
+            if self.board.in_bounds(x, y) and self.board.is_empty(x, y):
+                player.corners.add((x, y))
+        
+        # Check game over
+        self._check_game_over()
+    
+    def play_move(self, int player_idx, int action) -> bint:
+        """Play an action for the given player. Validates first."""
+        cdef Move move = self._action_moves[action]
+        
+        if not self.valid_move(player_idx, move):
+            return False
+        
+        self.apply_move(player_idx, move)
+        return True
+    
+    def next_player(self):
+        """Advance to the next player who can still move.
+        
+        If no players can move, the game is over.
+        """
+        if self.game_over:
+            return self.current_player
+        
+        for offset in range(1, self.num_players + 1):
+            next_idx = (self.current_player + offset) % self.num_players
+            next_player = self.players[next_idx]
+            if next_player.can_move and self.has_valid_moves(next_idx):
+                self.current_player = next_idx
+                return next_idx
+        
+        # No one can move — game over
+        self.game_over = True
+        return self.current_player
+    
+    def _check_game_over(self) -> None:
+        """Check if the game is over."""
+        cdef PlayerState player
+        cdef int player_idx
+        
+        for player_idx, player in enumerate(self.players):
+            if not self.has_valid_moves(player_idx):
+                player.can_move = False
+        
+        # Game ends if all players can't move
+        if all(not p.can_move for p in self.players):
+            self.game_over = True
+        elif all(p.has_started and not p.available_pieces for p in self.players):
+            # All pieces played
+            self.game_over = True
+    
+    def get_state(self) -> dict:
+        """Get the current game state as a dictionary."""
+        return {
+            "board_size": self.board_size,
+            "num_players": self.num_players,
+            "current_player": self.current_player,
+            "rounds": self.rounds,
+            "game_over": self.game_over,
+            "players": [
+                {
+                    "idx": p.idx,
+                    "available_pieces": list(p.available_pieces),
+                    "score": p.score,
+                    "has_started": p.has_started,
+                    "can_move": p.can_move,
+                }
+                for p in self.players
+            ],
+        }
+    
+    def copy(self) -> BlokusGame:
+        """Create a deep copy of the game."""
+        cdef BlokusGame new_game = BlokusGame(
+            board_size=self.board_size,
+            pieces=self.piece_set,
+            num_players=self.num_players,
+            corner_rule=self.corner_rule
+        )
+        
+        new_game.board = self.board.copy()
+        new_game.current_player = self.current_player
+        new_game.rounds = self.rounds
+        new_game.game_over = self.game_over
+        
+        for i, p in enumerate(self.players):
+            new_game.players[i].available_pieces = p.available_pieces.copy()
+            new_game.players[i].corners = p.corners.copy()
+            new_game.players[i].score = p.score
+            new_game.players[i].has_started = p.has_started
+            new_game.players[i].can_move = p.can_move
+        
+        return new_game

src/blokus_gym/core/board.py

@@ -49,18 +49,20 @@ class Board:
         """Get the player index at a cell (0 = empty)."""
         return self.grid[y, x]
 
-    def get_player_squares(self, player_idx: int) -> list[tuple[int, int]]:
+    def get_player_squares(self, player_idx: int, player_board_idx: int | None = None) -> list[tuple[int, int]]:
         """Get all squares occupied by a player."""
-        ys, xs = np.where(self.grid == player_idx)
+        if player_board_idx is None:
+            player_board_idx = player_idx + 1  # Default: PLAYER_OFFSET = 1
+        ys, xs = np.where(self.grid == player_board_idx)
         return [(int(x), int(y)) for x, y in zip(xs, ys, strict=True)]
 
-    def get_player_occupied(self, player_idx: int) -> set[tuple[int, int]]:
+    def get_player_occupied(self, player_board_idx: int) -> set[tuple[int, int]]:
         """Get all squares occupied by a player as a set for fast lookup."""
-        if player_idx not in self._occupied_cache:
+        if player_board_idx not in self._occupied_cache:
-            self._occupied_cache[player_idx] = set(self.get_player_squares(player_idx))
+            self._occupied_cache[player_board_idx] = set(self.get_player_squares(player_board_idx - 1, player_board_idx))
-        return self._occupied_cache[player_idx]
+        return self._occupied_cache[player_board_idx]
 
-    def get_player_corners(self, player_idx: int) -> set[tuple[int, int]]:
+    def get_player_corners(self, player_board_idx: int) -> set[tuple[int, int]]:
         """Get all corner cells adjacent to a player's pieces.
 
         Corner cells are the diagonal neighbors of a player's pieces.
@@ -68,7 +70,7 @@ class Board:
         (corner-to-corner contact rule).
         """
         corners: set[tuple[int, int]] = set()
-        player_squares = self.get_player_squares(player_idx)
+        player_squares = self.get_player_squares(player_board_idx - 1, player_board_idx)
         for x, y in player_squares:
             for dx, dy in [(-1, -1), (1, -1), (-1, 1), (1, 1)]:
                 cx, cy = x + dx, y + dy

src/blokus_gym/core/game.py

@@ -207,7 +207,7 @@ class BlokusGame:
         if player.has_started:
             placed_corners = self._get_placed_corners(move)
             # Use cached occupied squares from board for fast lookup
-            player_occupied = self.board.get_player_occupied(player_idx)
+            player_occupied = self.board.get_player_occupied(player_board_idx)
             touches_corner = any(
                 self.board.in_bounds(cx, cy) and (cx, cy) in player_occupied
                 for cx, cy in placed_corners
@@ -240,7 +240,7 @@ class BlokusGame:
         player_board_idx = player_idx + self.PLAYER_OFFSET
         
         # Pre-compute player's occupied squares ONCE (cached)
-        player_occupied = self.board.get_player_occupied(player_idx)
+        player_occupied = self.board.get_player_occupied(player_board_idx)
 
         for piece_id in available_piece_ids:
             for action_idx in self._actions_by_piece[piece_id]:

src/blokus_gym/core/setup_cython.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+"""Setup script for compiling Cython extensions."""
+
+from setuptools import setup, Extension
+from Cython.Build import cythonize
+import numpy as np
+
+# Define extensions with proper include directories
+extensions = [
+    Extension(
+        "blokus_cython",
+        ["blokus_cython.pyx"],
+        include_dirs=[np.get_include()],
+        define_macros=[("NPY_NO_DEPRECATED_API", "NPY_1_7_API_VERSION")],
+    ),
+]
+
+setup(
+    ext_modules=cythonize(
+        extensions,
+        compiler_directives={"language_level": "3"},
+        annotate=False,
+    ),
+    include_dirs=[np.get_include()],
+)

src/setup.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+"""Setup script for blokus_gym package."""
+
+from setuptools import setup, Extension
+from Cython.Build import cythonize
+import numpy as np
+
+# Define extensions with proper include directories
+extensions = [
+    Extension(
+        "blokus_gym.core.blokus_cython",
+        ["blokus_gym/core/blokus_cython.pyx"],
+        include_dirs=[np.get_include()],
+        define_macros=[("NPY_NO_DEPRECATED_API", "NPY_1_7_API_VERSION")],
+    ),
+]
+
+setup(
+    name="blokus_gym",
+    ext_modules=cythonize(
+        extensions,
+        compiler_directives={"language_level": "3"},
+        annotate=False,
+    ),
+    include_dirs=[np.get_include()],
+)