Legal movements of the chess pieces

Question

Legal movements of the chess pieces

Recently, I developed a chess game using vue.js and have successfully implemented legal move validation for the knight, pawn, and bishop pieces.

However, while working on the bishop validation, I encountered a challenge. It involves determining if there is a piece obstructing the path of the bishop.

For better clarity, please refer to the image linked below.

https://i.sstatic.net/Nyy4e.png

In the image, you can see how the red figures move past pawns and continue upwards instead of stopping at the pawn piece as intended.

Below is the code snippet related to bishop movement calculation. Additionally, any guidance on implementing validations for the queen and other pieces would be highly appreciated.

    var el = {  };
    // sample Data
    // Code snippets go here...

javascript vue.js chess calculation

Answer 1

Answer №1

Your for loop lacks code for collision detection, allowing the piece to move all the way to the edge of the board unchecked. One solution is to break the loop into four separate for loops, each ending at the board's edge or upon detecting a collision. Collisions must be handled differently based on whether it's with a piece of the same color (illegal move) or the opposite color (capture).

var dx = +1, dy = +1;
do {
  x += dx;
  y += dy;

  // A color piece collision stops the loop.
  // If encountering an opposite color piece, one last move is added.
  var onBoard = (x >= 0) && (x < 8) && (y >= 0) && (y < 8);
  var samePiece = onBoard ? (detect_collision_with_same_color_piece) : false;
  var oppPiece = onBoard ? (detect_collision_with_opp_color_piece) : false;

  if (onBoard && !samePiece) {
    offSet.push({ x: x, y: y });
  }
} while (onBoard && !samePiece && !oppPiece);

Please note that placeholders were left in the collision detection logic. Here are some additional considerations:

Parameterize dx and dy to iterate over all combinations of +1 and -1 to avoid repeating code.
If memory allows, padding the matrix with special values on all sides eliminates the need to continuously check the correctness of x and y. For instance, padding with white pawns could simplify the logic, removing the need for the onBoard condition.
Explore faster move generation techniques like rotated bitboards, which offer a different approach for improving performance.

Answer 2

Your for loop lacks code for collision detection, allowing the piece to move all the way to the edge of the board unchecked. One solution is to break the loop into four separate for loops, each ending at the board's edge or upon detecting a collision. Collisions must be handled differently based on whether it's with a piece of the same color (illegal move) or the opposite color (capture).

var dx = +1, dy = +1;
do {
  x += dx;
  y += dy;

  // A color piece collision stops the loop.
  // If encountering an opposite color piece, one last move is added.
  var onBoard = (x >= 0) && (x < 8) && (y >= 0) && (y < 8);
  var samePiece = onBoard ? (detect_collision_with_same_color_piece) : false;
  var oppPiece = onBoard ? (detect_collision_with_opp_color_piece) : false;

  if (onBoard && !samePiece) {
    offSet.push({ x: x, y: y });
  }
} while (onBoard && !samePiece && !oppPiece);

Please note that placeholders were left in the collision detection logic. Here are some additional considerations:

Parameterize dx and dy to iterate over all combinations of +1 and -1 to avoid repeating code.
If memory allows, padding the matrix with special values on all sides eliminates the need to continuously check the correctness of x and y. For instance, padding with white pawns could simplify the logic, removing the need for the onBoard condition.
Explore faster move generation techniques like rotated bitboards, which offer a different approach for improving performance.

Legal movements of the chess pieces

Answer №1

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