{
  "format": "lightmysky-pack",
  "version": 1,
  "name": "Chess basics",
  "description": "Learn the board, how every piece moves, and how to give your first checkmates.",
  "downloadable": true,
  "topics": [
    {
      "key": "the-board-and-setting-it-up",
      "subject": "Chess",
      "name": "The board and setting it up",
      "description": "The 64 squares and where every piece starts.",
      "ages": [
        6,
        8
      ],
      "lesson": "A chess board has 64 squares in an 8 by 8 grid. The squares take turns being light and dark. Half of them are light and half are dark.\n\nEach player starts with 16 pieces on the two rows closest to them. The back row holds a rook in each corner, then a knight, then a bishop, then the queen and king in the middle. The eight pawns stand in a line in front.\n\ntip: When you sit down, make sure a light square is in your right-hand corner. People say \"white on the right\" to remember it.\n\nexample: Set up your pieces, then check that your queen sits on a square of her own color. The white queen starts on a light square and the black queen on a dark square.\n\nrecap: The board has 64 light and dark squares, and each side sets up 16 pieces with the queen on her own color.",
      "questions": [
        {
          "type": "numeric",
          "prompt": "How many squares are on a chess board?",
          "answer": 64,
          "explanation": "The board is 8 rows of 8 squares, and 8 times 8 is 64.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "Which piece goes in the corner squares at the start?",
          "choices": [
            "Rook",
            "Knight",
            "Bishop",
            "Queen"
          ],
          "answerIndex": 0,
          "explanation": "Each player puts a rook in both back-row corners.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "The white queen starts on a dark square.",
          "answer": false,
          "explanation": "The queen starts on her own color, so the white queen begins on a light square.",
          "difficulty": 2
        },
        {
          "type": "numeric",
          "prompt": "How many pawns does each player start with?",
          "answer": 8,
          "explanation": "The eight pawns stand in a row in front of the other pieces.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "Where should a light square be when you set up the board?",
          "choices": [
            "In your right-hand corner",
            "In your left-hand corner",
            "In the middle",
            "It does not matter"
          ],
          "answerIndex": 0,
          "explanation": "Remember the saying \"white on the right\" for the near corner.",
          "difficulty": 2
        },
        {
          "type": "true_false",
          "prompt": "Each player begins the game with 16 pieces.",
          "answer": true,
          "explanation": "That is 8 pawns, 2 rooks, 2 knights, 2 bishops, 1 queen, and 1 king.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "Starting from a corner, what is the order of the back-row pieces?",
          "choices": [
            "Rook, knight, bishop",
            "Bishop, knight, rook",
            "Knight, rook, bishop"
          ],
          "answerIndex": 0,
          "explanation": "From the corner it goes rook, then knight, then bishop, then the king and queen.",
          "difficulty": 3
        },
        {
          "type": "numeric",
          "prompt": "How many pieces are on the board when the game begins, counting both sides?",
          "answer": 32,
          "explanation": "Each player has 16 pieces, and 16 plus 16 is 32.",
          "difficulty": 2
        }
      ]
    },
    {
      "key": "how-rooks-and-bishops-move",
      "subject": "Chess",
      "name": "How rooks and bishops move",
      "description": "Straight lines for the rook, diagonals for the bishop.",
      "ages": [
        6,
        9
      ],
      "after": [
        "#the-board-and-setting-it-up"
      ],
      "lesson": "The rook moves in straight lines. It can go up and down or side to side, as far as you like, until it reaches another piece or the edge of the board.\n\nThe bishop moves on diagonals. Each bishop stays on one color for the whole game. You start with one bishop on light squares and one on dark squares.\n\ntip: Neither piece can jump. If something stands in the way, the rook or bishop has to stop before it.\n\nexample: Put a rook alone in the middle of the board and count its squares. Then do the same with a bishop and see which one reaches more.\n\nrecap: Rooks move in straight lines and bishops move on diagonals, and neither one can jump over a piece.",
      "questions": [
        {
          "type": "mcq",
          "prompt": "How does a rook move?",
          "choices": [
            "In straight lines",
            "On diagonals",
            "In an L-shape"
          ],
          "answerIndex": 0,
          "explanation": "The rook slides up and down or side to side.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "How does a bishop move?",
          "choices": [
            "On diagonals",
            "In straight lines",
            "One square at a time"
          ],
          "answerIndex": 0,
          "explanation": "The bishop travels along diagonal lines of one color.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "A bishop can change from light squares to dark squares during a game.",
          "answer": false,
          "explanation": "A bishop stays on its own color the whole game.",
          "difficulty": 2
        },
        {
          "type": "true_false",
          "prompt": "A rook can jump over a piece that is in its way.",
          "answer": false,
          "explanation": "The rook has to stop before any piece blocking its path.",
          "difficulty": 1
        },
        {
          "type": "numeric",
          "prompt": "On an empty board, how many squares can a rook reach from any square it stands on?",
          "answer": 14,
          "explanation": "It reaches 7 squares one way and 7 the other, which is 14.",
          "difficulty": 3
        },
        {
          "type": "numeric",
          "prompt": "How many bishops does each player start with?",
          "answer": 2,
          "explanation": "One bishop starts on a light square and the other on a dark square.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "One of your bishops stays on light squares and the other on dark squares.",
          "answer": true,
          "explanation": "That is why the two bishops never meet on the same square.",
          "difficulty": 2
        },
        {
          "type": "mcq",
          "prompt": "A bishop sits on a dark square. Which square can it move to?",
          "choices": [
            "Another dark square",
            "A light square",
            "Any square"
          ],
          "answerIndex": 0,
          "explanation": "Diagonals keep a bishop on its own color, so a dark-square bishop lands on dark squares.",
          "difficulty": 2
        }
      ]
    },
    {
      "key": "how-the-queen-and-king-move",
      "subject": "Chess",
      "name": "How the queen and king move",
      "description": "The strongest piece and the most important one.",
      "ages": [
        6,
        9
      ],
      "after": [
        "#how-rooks-and-bishops-move"
      ],
      "lesson": "The queen is the strongest piece. She moves in straight lines like a rook and on diagonals like a bishop, as far as she can go.\n\nThe king moves one square at a time in any direction. He is slow, but he is the most important piece of all. If your king cannot get to safety, you lose the game.\n\ntip: The queen puts the rook's moves and the bishop's moves together. That is why she is so strong.\n\nexample: Place a queen in the middle of an empty board and trace every line she can travel. Then do the same with a king and count how few squares he reaches.\n\nrecap: The queen moves like a rook and bishop together, while the king moves just one square but matters most.",
      "questions": [
        {
          "type": "mcq",
          "prompt": "The queen moves like which two pieces combined?",
          "choices": [
            "Rook and bishop",
            "Knight and rook",
            "Bishop and knight"
          ],
          "answerIndex": 0,
          "explanation": "She uses the rook's straight lines and the bishop's diagonals.",
          "difficulty": 2
        },
        {
          "type": "numeric",
          "prompt": "From the middle of the board, how many squares can a king move to in one turn?",
          "answer": 8,
          "explanation": "The king can step one square in each of the 8 directions.",
          "difficulty": 2
        },
        {
          "type": "true_false",
          "prompt": "The king can slide many squares in a straight line like a rook.",
          "answer": false,
          "explanation": "The king moves only one square at a time.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "Which piece is the most important to keep safe?",
          "choices": [
            "King",
            "Queen",
            "Rook"
          ],
          "answerIndex": 0,
          "explanation": "If your king cannot reach safety, you lose the game.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "The queen can move both in straight lines and on diagonals.",
          "answer": true,
          "explanation": "She combines the rook's and the bishop's moves.",
          "difficulty": 1
        },
        {
          "type": "numeric",
          "prompt": "How many queens does each player start with?",
          "answer": 1,
          "explanation": "Each side has one queen, next to the king at the start.",
          "difficulty": 1
        },
        {
          "type": "numeric",
          "prompt": "From a corner, how many squares can a king move to?",
          "answer": 3,
          "explanation": "In a corner the king has only 3 squares next to it.",
          "difficulty": 3
        },
        {
          "type": "true_false",
          "prompt": "Even though the queen moves farther, losing the king loses the game.",
          "answer": true,
          "explanation": "Power on the board is not the same as importance, and the king matters most.",
          "difficulty": 2
        }
      ]
    },
    {
      "key": "the-knight-s-jump",
      "subject": "Chess",
      "name": "The knight's jump",
      "description": "The L-shaped move and the only piece that jumps.",
      "ages": [
        7,
        10
      ],
      "after": [
        "#the-board-and-setting-it-up"
      ],
      "lesson": "The knight moves in the shape of the letter L. It goes two squares in one direction, then one square to the side. Trace it slowly the first few times.\n\nThe knight is the only piece that can jump. It can hop right over its own pieces or the other side's pieces and land on the far square.\n\ntip: A knight always lands on a square of the opposite color from the one it left. A knight on a light square lands on a dark square.\n\nexample: Put a knight in a corner and count its moves. Then move it to the middle and count again. It reaches many more squares from the center.\n\nrecap: The knight moves in an L-shape, it can jump over other pieces, and it lands on the opposite color each time.",
      "questions": [
        {
          "type": "mcq",
          "prompt": "What shape does the knight move in?",
          "choices": [
            "An L-shape",
            "A straight line",
            "A diagonal"
          ],
          "answerIndex": 0,
          "explanation": "Two squares one way, then one square to the side, makes an L.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "The knight is the only piece that can jump over others.",
          "answer": true,
          "explanation": "Every other piece has to stop when something blocks its path.",
          "difficulty": 1
        },
        {
          "type": "numeric",
          "prompt": "From a corner, how many squares can a knight move to?",
          "answer": 2,
          "explanation": "A knight tucked in a corner has only 2 L-moves.",
          "difficulty": 3
        },
        {
          "type": "numeric",
          "prompt": "From the middle of the board, how many squares can a knight reach?",
          "answer": 8,
          "explanation": "A centered knight can jump to 8 different squares.",
          "difficulty": 2
        },
        {
          "type": "mcq",
          "prompt": "A knight starts on a light square. What color square does it land on?",
          "choices": [
            "A dark square",
            "A light square",
            "Either color"
          ],
          "answerIndex": 0,
          "explanation": "Every knight move switches to the opposite color.",
          "difficulty": 2
        },
        {
          "type": "true_false",
          "prompt": "A knight can move even when its own pieces are all around it.",
          "answer": true,
          "explanation": "It jumps right over them and lands on the far square.",
          "difficulty": 2
        },
        {
          "type": "mcq",
          "prompt": "How far does a knight go on its L-move?",
          "choices": [
            "Two squares, then one to the side",
            "Three squares straight",
            "One square in any direction"
          ],
          "answerIndex": 0,
          "explanation": "Two in a line and one to the side is the knight's jump.",
          "difficulty": 1
        },
        {
          "type": "numeric",
          "prompt": "How many knights does each player start with?",
          "answer": 2,
          "explanation": "The knights begin next to the rooks in the corners.",
          "difficulty": 1
        }
      ]
    },
    {
      "key": "pawns-capturing-and-promotion",
      "subject": "Chess",
      "name": "Pawns, capturing, and promotion",
      "description": "How pawns move, take, and turn into a stronger piece.",
      "ages": [
        6,
        10
      ],
      "after": [
        "#the-board-and-setting-it-up"
      ],
      "lesson": "Pawns move straight forward, one square at a time. On a pawn's very first move it may go one or two squares. A pawn can never move backward.\n\nPawns capture in a different way from how they move. They take by going one square forward on a diagonal, never straight ahead.\n\ntip: A pawn blocked by a piece right in front of it is stuck. It cannot take the piece it is facing, only pieces on its two forward corners.\n\nexample: Set up a white pawn and a black piece one square ahead on a diagonal. See how the pawn captures by stepping onto that diagonal square.\n\nWhen a pawn reaches the far end of the board it promotes. You trade it for a stronger piece, almost always a queen.\n\nrecap: Pawns move forward, capture on the diagonal, never go backward, and promote when they reach the far side.",
      "questions": [
        {
          "type": "mcq",
          "prompt": "How does a pawn capture?",
          "choices": [
            "One square forward on a diagonal",
            "Straight forward",
            "Sideways"
          ],
          "answerIndex": 0,
          "explanation": "A pawn takes on the diagonal, not the way it normally moves.",
          "difficulty": 2
        },
        {
          "type": "numeric",
          "prompt": "How many squares can a pawn move on its very first turn?",
          "answer": 2,
          "explanation": "On its first move a pawn may go one or two squares forward.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "A pawn can move backward.",
          "answer": false,
          "explanation": "Pawns only go forward, never back toward their own side.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "What happens when a pawn reaches the far end of the board?",
          "choices": [
            "It becomes a stronger piece",
            "It is removed",
            "It stays a pawn"
          ],
          "answerIndex": 0,
          "explanation": "The pawn promotes and turns into a stronger piece.",
          "difficulty": 2
        },
        {
          "type": "mcq",
          "prompt": "When a pawn promotes, which piece do players usually choose?",
          "choices": [
            "Queen",
            "Knight",
            "Bishop"
          ],
          "answerIndex": 0,
          "explanation": "The queen is the strongest, so most players pick her.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "A pawn can capture the piece directly in front of it.",
          "answer": false,
          "explanation": "Pawns capture on the diagonal, so a piece straight ahead is safe from it.",
          "difficulty": 2
        },
        {
          "type": "numeric",
          "prompt": "After its first move, how many squares does a pawn go forward at a time?",
          "answer": 1,
          "explanation": "Only the first move can be two squares, after that it is one.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "A pawn is blocked by a piece right in front of it, with no pieces on its forward diagonals. What can it do?",
          "choices": [
            "It cannot move",
            "Capture the piece ahead",
            "Move backward"
          ],
          "answerIndex": 0,
          "explanation": "It cannot take straight ahead and has no diagonal targets, so it is stuck.",
          "difficulty": 3
        }
      ]
    },
    {
      "key": "check-and-getting-out-of-it",
      "subject": "Chess",
      "name": "Check and getting out of it",
      "description": "When the king is attacked and the three ways to escape.",
      "ages": [
        7,
        10
      ],
      "after": [
        "#how-rooks-and-bishops-move",
        "#how-the-queen-and-king-move"
      ],
      "lesson": "A king is in check when another piece is attacking it. Check is a warning: your king is in danger right now and you must deal with it this turn.\n\nThere are three ways to get out of check. You can move the king to a safe square. You can put one of your own pieces in the way to block the attack. Or you can capture the piece that is giving check.\n\ntip: You are never allowed to leave your own king in check. If a move would do that, it is not a legal move.\n\nexample: Set up a king with an enemy rook checking it along a row. Find all three answers: a square to run to, a piece to block with, and a way to take the rook.\n\nrecap: Check means the king is under attack, and you must move, block, or capture to get out of it.",
      "questions": [
        {
          "type": "mcq",
          "prompt": "What does it mean when a king is in check?",
          "choices": [
            "It is being attacked",
            "It has been captured",
            "It can never move again"
          ],
          "answerIndex": 0,
          "explanation": "Check is a warning that the king is under attack.",
          "difficulty": 1
        },
        {
          "type": "numeric",
          "prompt": "How many ways are there to get out of check?",
          "answer": 3,
          "explanation": "You can move the king, block the attack, or capture the attacker.",
          "difficulty": 2
        },
        {
          "type": "mcq",
          "prompt": "Which of these is NOT a way to escape check?",
          "choices": [
            "Ignore it and move somewhere else",
            "Move the king to safety",
            "Block the attack with a piece"
          ],
          "answerIndex": 0,
          "explanation": "You cannot ignore check, you must deal with it this turn.",
          "difficulty": 2
        },
        {
          "type": "true_false",
          "prompt": "You are allowed to leave your own king in check if you want.",
          "answer": false,
          "explanation": "Leaving your king in check is against the rules.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "Capturing the piece that gives check is one way to escape it.",
          "answer": true,
          "explanation": "If the attacker is gone, the check is gone too.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "Your king is in check from a bishop. Which is a legal response?",
          "choices": [
            "Block the check with another piece",
            "Make a move that keeps the king in check",
            "Skip your turn"
          ],
          "answerIndex": 0,
          "explanation": "Blocking the diagonal stops the bishop's attack.",
          "difficulty": 2
        },
        {
          "type": "true_false",
          "prompt": "Moving the king to a safe square is a legal way to answer check.",
          "answer": true,
          "explanation": "Running the king to safety is one of the three escapes.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "A move would leave your own king in check. What is true about that move?",
          "choices": [
            "It is against the rules",
            "It is a clever trick",
            "It wins the game"
          ],
          "answerIndex": 0,
          "explanation": "You may never make a move that leaves your king in check.",
          "difficulty": 3
        }
      ]
    },
    {
      "key": "simple-checkmates",
      "subject": "Chess",
      "name": "Simple checkmates",
      "description": "Back-rank mate and the two-rook ladder.",
      "ages": [
        8,
        11
      ],
      "after": [
        "#check-and-getting-out-of-it",
        "#how-rooks-and-bishops-move",
        "#how-the-queen-and-king-move"
      ],
      "lesson": "Checkmate happens when a king is in check and there is no way out. The king cannot move to safety, the check cannot be blocked, and the attacking piece cannot be taken. That ends the game.\n\nA back-rank mate uses a rook or queen along the king's own back row. The king is trapped because its own pawns block the squares in front of it.\n\nTwo rooks can mate a lone king together. One rook checks along a row while the other guards the next row, so the king is pushed to the edge step by step. People call it the ladder.\n\ntip: To finish a mate you take away every escape square. The enemy king should have nowhere left to go.\n\nexample: Set up a king on its back row with pawns in front, then bring a rook onto that row. Watch how the king has no square to run to.\n\nrecap: Checkmate is a check with no escape, and two rooks or a back-rank rook can trap the king.",
      "questions": [
        {
          "type": "mcq",
          "prompt": "What is checkmate?",
          "choices": [
            "A check with no way out",
            "A check you can block",
            "A draw"
          ],
          "answerIndex": 0,
          "explanation": "The king is in check and cannot move, block, or capture to escape.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "In a back-rank mate, the king is often trapped by its own pawns.",
          "answer": true,
          "explanation": "The pawns in front block the king's escape squares.",
          "difficulty": 2
        },
        {
          "type": "numeric",
          "prompt": "How many rooks work together in a two-rook ladder mate?",
          "answer": 2,
          "explanation": "The two rooks take turns checking and guarding.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "In the two-rook ladder, what do the rooks do to the king?",
          "choices": [
            "Push it to the edge of the board",
            "Let it escape to the center",
            "Capture the king"
          ],
          "answerIndex": 0,
          "explanation": "Each check drives the king one row closer to the edge.",
          "difficulty": 2
        },
        {
          "type": "true_false",
          "prompt": "At checkmate the king is actually taken off the board.",
          "answer": false,
          "explanation": "The game ends at checkmate, before the king is ever captured.",
          "difficulty": 2
        },
        {
          "type": "mcq",
          "prompt": "To finish a checkmate, what do you need to do?",
          "choices": [
            "Take away every escape square",
            "Leave the king one safe square",
            "Trade the queens first"
          ],
          "answerIndex": 0,
          "explanation": "If even one safe square is left, it is check, not checkmate.",
          "difficulty": 2
        },
        {
          "type": "true_false",
          "prompt": "A back-rank mate can be given by a rook along the king's own back row.",
          "answer": true,
          "explanation": "A rook on the back row with the king boxed in gives mate.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "The king is in check, cannot move, cannot block, and the checking piece cannot be captured. What is this?",
          "choices": [
            "Checkmate",
            "Check",
            "A normal move"
          ],
          "answerIndex": 0,
          "explanation": "A check with no escape at all is checkmate.",
          "difficulty": 3
        }
      ]
    },
    {
      "key": "making-good-trades",
      "subject": "Chess",
      "name": "Making good trades",
      "description": "Piece values and how to come out ahead.",
      "ages": [
        8,
        11
      ],
      "after": [
        "#how-rooks-and-bishops-move",
        "#how-the-queen-and-king-move",
        "#the-knight-s-jump",
        "#pawns-capturing-and-promotion"
      ],
      "lesson": "Every piece is worth about a number of points. This helps you decide if a trade is good. A pawn is worth 1. A knight is worth 3 and a bishop is worth 3. A rook is worth 5. The queen is worth 9.\n\nA trade means you give up a piece and take one of the other side's pieces. A good trade wins points: you give a smaller piece and take a bigger one.\n\ntip: The king has no number because you can never trade it. Losing the king loses the game.\n\nexample: You can take a rook worth 5 with your bishop worth 3. Count the points. You come out ahead, so it is a good trade.\n\nrecap: Pawns are 1, knights and bishops are 3, rooks are 5, and the queen is 9, so trade a smaller piece for a bigger one.",
      "questions": [
        {
          "type": "numeric",
          "prompt": "How many points is a rook worth?",
          "answer": 5,
          "explanation": "A rook counts as 5 points.",
          "difficulty": 1
        },
        {
          "type": "numeric",
          "prompt": "How many points is the queen worth?",
          "answer": 9,
          "explanation": "The queen is the most valuable, worth 9 points.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "A knight and a bishop are each worth how many points?",
          "choices": [
            "3",
            "5",
            "1"
          ],
          "answerIndex": 0,
          "explanation": "The knight and the bishop are both worth 3 points.",
          "difficulty": 2
        },
        {
          "type": "numeric",
          "prompt": "How many points is a pawn worth?",
          "answer": 1,
          "explanation": "The pawn is the smallest, worth 1 point.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "Giving up a bishop to win a rook is a good trade.",
          "answer": true,
          "explanation": "You give 3 points and win 5, so you come out ahead.",
          "difficulty": 2
        },
        {
          "type": "mcq",
          "prompt": "Which piece has no point value because you can never trade it?",
          "choices": [
            "King",
            "Queen",
            "Rook"
          ],
          "answerIndex": 0,
          "explanation": "The king cannot be traded, so it has no number.",
          "difficulty": 2
        },
        {
          "type": "mcq",
          "prompt": "Which is the better trade for you?",
          "choices": [
            "Your knight for their rook",
            "Your rook for their knight",
            "Your queen for their pawn"
          ],
          "answerIndex": 0,
          "explanation": "Giving a 3-point knight for a 5-point rook wins you points.",
          "difficulty": 3
        },
        {
          "type": "true_false",
          "prompt": "A queen is worth more points than a rook.",
          "answer": true,
          "explanation": "The queen is worth 9 and the rook is worth 5.",
          "difficulty": 1
        }
      ]
    },
    {
      "key": "first-opening-ideas",
      "subject": "Chess",
      "name": "First opening ideas",
      "description": "Take the center, develop your pieces, and castle.",
      "ages": [
        9,
        11
      ],
      "after": [
        "#how-rooks-and-bishops-move",
        "#the-knight-s-jump",
        "#pawns-capturing-and-promotion",
        "#how-the-queen-and-king-move",
        "#check-and-getting-out-of-it"
      ],
      "lesson": "The start of the game is called the opening. Three ideas guide you: take the center, wake up your pieces, and make your king safe.\n\nThe center is the four squares in the middle. Pushing a pawn there gives your pieces more room and more power.\n\nDeveloping means bringing your knights and bishops off the back row toward the center so they can help. Try not to move the same piece twice early, and do not rush your queen out.\n\nCastling tucks your king into safety. The king slides two squares toward a rook and the rook hops to the king's other side. You cannot castle while your king is in check, or across a square that is attacked.\n\ntip: A short checklist for the opening: a center pawn, then knights and bishops out, then castle.\n\nrecap: In the opening, control the center, develop your knights and bishops, and castle to keep your king safe.",
      "questions": [
        {
          "type": "mcq",
          "prompt": "What are the three main ideas in the opening?",
          "choices": [
            "Control the center, develop pieces, castle",
            "Trade every piece, attack, resign",
            "Move only pawns the whole time"
          ],
          "answerIndex": 0,
          "explanation": "Center, development, and king safety guide the opening.",
          "difficulty": 2
        },
        {
          "type": "numeric",
          "prompt": "How many squares make up the center of the board?",
          "answer": 4,
          "explanation": "The center is the four squares in the very middle.",
          "difficulty": 2
        },
        {
          "type": "true_false",
          "prompt": "Developing means bringing your knights and bishops toward the center.",
          "answer": true,
          "explanation": "Developed pieces are off the back row and ready to help.",
          "difficulty": 1
        },
        {
          "type": "mcq",
          "prompt": "Castling mainly helps you to:",
          "choices": [
            "Keep your king safe",
            "Win a pawn",
            "Promote faster"
          ],
          "answerIndex": 0,
          "explanation": "Castling tucks the king away and connects the rooks.",
          "difficulty": 1
        },
        {
          "type": "true_false",
          "prompt": "You can castle while your king is in check.",
          "answer": false,
          "explanation": "You are not allowed to castle out of check.",
          "difficulty": 2
        },
        {
          "type": "mcq",
          "prompt": "Which is good opening advice?",
          "choices": [
            "Do not move the same piece twice early",
            "Bring your queen out first",
            "Keep your king in the center"
          ],
          "answerIndex": 0,
          "explanation": "Moving one piece twice early wastes time you could use developing others.",
          "difficulty": 2
        },
        {
          "type": "numeric",
          "prompt": "When you castle, how many squares does the king move?",
          "answer": 2,
          "explanation": "The king slides two squares toward the rook.",
          "difficulty": 3
        },
        {
          "type": "true_false",
          "prompt": "Pushing a pawn to the center gives your pieces more room.",
          "answer": true,
          "explanation": "A center pawn opens lines for your bishops and queen.",
          "difficulty": 1
        }
      ]
    }
  ]
}