Chess

function solve(params) {
    var rows = parseInt(params[0]),
        cols = parseInt(params[1]),
        tests = parseInt(params[rows + 2]), i, j, move,
        board = [],
        answer = [];

    for (var j = 0; j < rows; j += 1) {
        board[j] = params[j + 2].split('');
    }

    for (i = 0; i < tests; i++) {
        move = params[rows + 3 + i].split(' ');
        var currentRow = rows - move[0][1] * 1,
            currentCol = move[0][0].charCodeAt() - 97,
            targetRow = rows - move[1][1] * 1,
            targetCol = move[1][0].charCodeAt() - 97;

        var figure = board[currentRow][currentCol];

        if (currentRow === targetRow && currentCol === targetCol) {
            answer.push('no');
            continue;
        }

        while (true) {
            if (figure === 'Q') {
                if (targetRow !== currentRow && targetCol !== currentCol) {
                    if (Math.abs(targetRow - currentRow) !== Math.abs(targetCol - currentCol)) {
                        answer.push('no');
                        break;
                    }
                }
                if (Math.abs(targetRow - currentRow) === Math.abs(targetCol - currentCol)) {
                    moveDiagonally();
                } else {
                    moveStraight()
                }
            } else if (figure === 'B') {
                if (targetRow === currentRow || targetCol === currentCol) {
                    answer.push('no');
                    break;
                }
                if (Math.abs(targetRow - currentRow) !== Math.abs(targetCol - currentCol)) {
                    answer.push('no');
                    break;
                }

                moveDiagonally();
            } else if (figure === 'R') {
                if (targetRow !== currentRow && targetCol != currentCol) {
                    answer.push('no');
                    break;
                }

                moveStraight()
            } else {
                answer.push('no');
                break;
            }

            if (board[currentRow][currentCol] === 'R' || board[currentRow][currentCol] === 'B' || board[currentRow][currentCol] === 'Q') { // check '-'
                answer.push('no');
                break;
            }

            if (targetRow === currentRow && targetCol === currentCol) {
                answer.push('yes');
                break;
            }
        }
    }

    function moveDiagonally() {
        if (targetRow < currentRow) {
            if (targetCol < currentCol) {
                currentRow--;
                currentCol--;
            } else {
                currentRow--;
                currentCol++;
            }
        } else {
            if (targetCol < currentCol) {
                currentRow++;
                currentCol--;
            } else {
                currentRow++;
                currentCol++;
            }
        }
    }

    function moveStraight() {
        if (targetRow < currentRow) {
            currentRow--;
        } else if (targetRow > currentRow) {
            currentRow++;
        } else if (targetCol < currentCol) {
            currentCol--
        } else if (targetCol > currentCol) {
            currentCol++;
        }
    }

    return answer.join('\n').trim();
}