Special moves (castling, en passant) in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if castling is allowed by verifying the king's and rook's {{BLANK_1}} status.

LLD

if not king.[1] and not rook.[1]:
    allow_castling = True

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

Ais_attacked

Bcan_move

Cis_checked

Dhas_moved

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'has_moved' with 'can_move' or 'is_checked'.

Castling is only allowed if neither the king nor the rook has moved before.

2fill in blank

medium

Complete the code to detect if en passant capture is possible by checking the opponent pawn's {{BLANK_1}} move.

LLD

if opponent_pawn.last_move == [1]:
    allow_en_passant = True

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

Asingle_step

Bdouble_step

Ccapture_move

Dcastle_move

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'single_step' or other move types instead of 'double_step'.

En passant is only possible if the opponent pawn just moved two squares forward in one move.

3fill in blank

hard

Fix the error in the castling validation by correctly checking if the squares between king and rook are {{BLANK_1}}.

LLD

for square in squares_between:
    if square.[1]:
        return False

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

Ais_occupied

Bis_empty

Cis_attacked

Dis_safe

Attempts:

3 left

💡 Hint

Common Mistakes

Checking if squares are empty instead of occupied.

Castling is not allowed if any square between the king and rook is occupied.

4fill in blank

hard

Fill both blanks to correctly update the board after an en passant move.

LLD

board.move_piece(pawn, [1])
board.remove_piece([2])

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Atarget_square

Bcaptured_pawn_square

Cpawn.position

Den_passant_capture_square

Attempts:

3 left

💡 Hint

Common Mistakes

Removing the wrong piece or moving the pawn incorrectly.

The pawn moves to the target square, and the captured pawn is removed from its square.

5fill in blank

hard

Fill all three blanks to implement castling: move the king, move the rook, and update their {{BLANK_1}}, {{BLANK_2}}, and {{BLANK_3}} status.

LLD

board.move_piece(king, [1])
board.move_piece(rook, [2])
king.[3] = True
rook.[3] = True

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

Aking_target_square

Brook_target_square

Chas_moved

Dcan_castle

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong target squares or wrong status properties.

Castling moves the king and rook to their target squares and marks both as having moved.