Super-Queens verify safe board layout

gistfile1.txt

boolean canMove(int row, int col) {
    // check we don't have any super0-queen on same row
    for(int i = 0; i<col ;i++) {
        if(board[row][i] == true) {
            return false;
        }
    }

    // check there is no already a queen not already on the left diag to the bottom of the (row, col)
    for(int i = row, j = col; i>=0 && j >= 0; i --, j--) {
        if(board[i][j] == true) {
            return false;
        }
    }

    // check there is no already a queen not already on the left diag to the topo of the (row, col)

    for(int i = row, j = col; i < board.length && j >= 0; i ++, j--) {
        if(board[i][j] == true) {
            return false;
        }
    }
    // check knight moves
    for(int x = -2; x<=2; x++) {
        for(int y = - 2; y<=2; y++) {
            if(Math.abs(x - y) == 1) {
                dx = row + x;
                dy = col + y;
                if(dx < 0 || dy < 0 || dx >= board.length || dy >= board.length) {
                    continue;
                }
                if(board[dx][dy] == true) {
                    return false
                }
            }
        }
    }
    return true;
}