Contract con_checkers_v1
| Creator | ae9cfa894495930b8d2f1707ab936325b5c848ace677bb8ba41dfe7dcdb3e3e6 |
| Creation Hash | 4b031876cfa2bd9487bda9f32adcbf36cfdf017ea72d295af68e3bf86c260e39 |
| Created On | 847 days ago - 12/29/2021, 8:46:22 PM UTC+0 |
Contract Code
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# con_checkers_v1
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NUM_ROWS = NUM_COLS = 8
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NUM_SQUARES = NUM_ROWS * NUM_COLS
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INITIAL_BOARD = ' b b b bb b b b b b b b w w w w w w w ww w w w '
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assert len(INITIAL_BOARD) == NUM_SQUARES, 'Invalid initial board.'
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def coords_to_index(x: int, y: int) -> int:
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assert valid_coords(x, y), 'Invalid (x, y): ({}, {})'.format(x, y)
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return x * NUM_ROWS + y
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def index_to_coords(index: int) -> tuple:
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assert valid_index(index), 'Invalid index: {}'.format(index)
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x = index // NUM_ROWS
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y = index % NUM_ROWS
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return (x, y)
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def valid_index(index: int) -> bool:
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return index >= 0 and index < NUM_SQUARES
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def valid_coords(x: int, y: int) -> bool:
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return x >= 0 and x < NUM_ROWS and y >= 0 and y < NUM_COLS
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MOVE_VECTORS = {
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'b': [(1, 1), (1, -1)],
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'w': [(-1, 1), (-1, -1)],
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'B': [(-1, -1), (-1, 1), (1, -1), (1, 1)],
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'W': [(-1, -1), (-1, 1), (1, -1), (1, 1)],
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}
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JUMP_VECTORS = {
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'b': [(2, 2), (2, -2)],
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'w': [(-2, 2), (-2, -2)],
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'B': [(-2, -2), (-2, 2), (2, -2), (2, 2)],
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'W': [(-2, -2), (-2, 2), (2, -2), (2, 2)],
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}
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OPPOSING = {
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'b': 'w',
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'B': 'w',
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'w': 'b',
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'W': 'b'
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}
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INITIAL_STATE = {
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'current_player': 'b',
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'board': str(INITIAL_BOARD),
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'creator_team': 'b',
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'opponent_team': 'w',
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}
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@export
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def get_initial_state(x: str = None) -> dict:
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return INITIAL_STATE
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def opposing_team(team: str) -> str:
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return OPPOSING[team.lower()]
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def check_for_jumps(board: str, team: str) -> bool:
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has_jumps = False
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opponent = opposing_team(team)
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for row in range(NUM_ROWS):
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for col in range(NUM_COLS):
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piece = board[row*NUM_ROWS+col]
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if piece.lower() == team:
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for valid_jump in JUMP_VECTORS[piece]:
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next_x = row + valid_jump[0]
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next_y = col + valid_jump[1]
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if valid_coords(next_x, next_y) and board[coords_to_index(next_x, next_y)] == ' ':
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# Check if opponent piece is in between
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inbetween_x = row + valid_jump[0] // 2
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inbetween_y = col + valid_jump[1] // 2
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inbetween_index = coords_to_index(inbetween_x, inbetween_y)
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if board[inbetween_index].lower() == opponent:
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has_jumps = True
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break
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if has_jumps:
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break
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if has_jumps:
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break
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return has_jumps
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def check_for_moves(board: str, team: str) -> bool:
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has_moves = False
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for row in range(NUM_ROWS):
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for col in range(NUM_COLS):
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piece = board[row*NUM_ROWS+col]
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if piece.lower() == team:
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for valid_move in MOVE_VECTORS[piece]:
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next_x = row + valid_move[0]
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next_y = col + valid_move[1]
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if valid_coords(next_x, next_y) and board[coords_to_index(next_x, next_y)] == ' ':
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# Check if opponent piece is in between
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has_moves = True
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break
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if has_moves:
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break
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if has_moves:
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break
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return has_moves
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@export
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def force_end_round(state: dict, metadata: dict):
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if state.get('winner') is None:
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state['stalemate'] = True
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@export
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def move(caller: str, team: str, payload: dict, state: dict, metadata: dict):
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x1=payload['x1']
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y1=payload['y1']
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x2=payload['x2']
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y2=payload['y2']
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board = list(state['board'])
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curr_x = x1
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curr_y = y1
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curr_index = coords_to_index(x1, y1)
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curr_piece = board[curr_index]
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assert state['current_player'] == team, 'It is not your turn to move.'
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assert curr_piece.lower() == team, 'This is not your piece to move.'
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opponent = opposing_team(team)
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valid_moves = MOVE_VECTORS[curr_piece]
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valid_jumps = JUMP_VECTORS[curr_piece]
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for i in range(len(x2)):
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next_x = x2[i]
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next_y = y2[i]
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next_vector = (next_x - curr_x, next_y - curr_y)
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next_index = coords_to_index(next_x, next_y)
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if next_vector in valid_jumps and board[next_index] == ' ':
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# Check there is an opposing piece
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inbetween_x = curr_x + next_vector[0] // 2
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inbetween_y = curr_y + next_vector[1] // 2
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inbetween_index = coords_to_index(inbetween_x, inbetween_y)
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assert board[inbetween_index].lower() == opponent, 'You cannot jump this square.'
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board[inbetween_index] = ' '
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board[curr_index] = ' '
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board[next_index] = curr_piece
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elif next_vector in valid_moves and board[next_index] == ' ':
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# Check for jumps
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assert not check_for_jumps(board, team), 'Must perform jump.'
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# Simple move
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board[next_index] = curr_piece
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board[curr_index] = ' '
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else:
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assert False, 'Invalid move.'
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# Check for kings
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if team == 'b' and next_x == NUM_ROWS - 1:
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if curr_piece == curr_piece.lower():
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assert i == len(x2) -1, 'Cannot make a move after promoting to a king.'
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board[next_index] = board[next_index].upper()
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elif team == 'w' and next_x == 0:
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if curr_piece == curr_piece.lower():
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assert i == len(x2) -1, 'Cannot make a move after promoting to a king.'
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board[next_index] = board[next_index].upper()
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curr_x = next_x
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curr_y = next_y
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curr_index = next_index
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opponent_has_jumps = check_for_jumps(board, opponent)
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opponent_has_moves = check_for_moves(board, opponent)
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board = ''.join(board)
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state['current_player'] = opponent
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state['board'] = board
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if not opponent_has_jumps and not opponent_has_moves:
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state['winner'] = team
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Byte Code
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