Move validation and check detection in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a move is valid based on piece rules.

LLD

def is_valid_move(piece, start, end):
    return piece.can_move_to([1])

Drag options to blanks, or click blank then click option'

Aboard

Bstart

Cpiece

Dend

Attempts:

3 left

💡 Hint

Common Mistakes

Using the start position instead of the end position for validation.

The move validity is checked by asking the piece if it can move to the end position.

2fill in blank

medium

Complete the code to detect if the king is in check after a move.

LLD

def is_king_in_check(board, color):
    king_pos = board.find_king([1])
    return board.is_under_attack(king_pos, color)

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Acolor

Bboard

Cking_pos

Dopponent_color

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the board or opponent color instead of the player's color.

The function finds the king of the given color to check if it is under attack.

3fill in blank

hard

Fix the error in the code that simulates a move to check for check detection.

LLD

def move_causes_check(board, move, color):
    board_copy = board.copy()
    board_copy.apply_move(move)
    return board_copy.is_king_in_check([1])

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Acolor

Bmove.piece.color

Cboard_copy

Dmove

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the move or piece color instead of the player's color.

The check detection must be done for the color of the player making the move.

4fill in blank

hard

Fill both blanks to create a function that validates a move and checks if it leaves the king safe.

LLD

def validate_move(board, move, color):
    if not board.is_valid_move([1]):
        return False
    if move_causes_check(board, move, [2]):
        return False
    return True

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Amove

Bboard

Ccolor

Dmove.piece

Attempts:

3 left

💡 Hint

Common Mistakes

Using board instead of move for validation.

Using move.piece instead of color for check detection.

The function first checks if the move is valid on the board, then checks if the move causes check for the player's color.

5fill in blank

hard

Fill all three blanks to implement a function that filters legal moves from all possible moves.

LLD

def get_legal_moves(board, color):
    possible_moves = board.get_all_moves([1])
    legal_moves = [move for move in possible_moves if validate_move([2], move, [3])]
    return legal_moves

Drag options to blanks, or click blank then click option'

Acolor

Bboard

Dmove

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up move and color in the list comprehension.

Passing wrong parameters to validate_move.

The function gets all moves for the player's color, then filters moves by validating each move on the board for that color.