How do I find the individual score for the given problem in C#

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Bill, Tommy and Daisy are playing basket ball. Bill's father is capturing the score. Each player gets 2 chances. prompt the user to input the player's name who scored the basket. If a player is not scoring in his/her chance, enter a space.

Quote:

Scoring Condition:
Bill's father records the basket scorer's name. Each basket gives the player 1 point.

If any player is scoring continuous basket , then they will get one bonus point.

For example, if Bill baskets 1st and 2nd consecutively, he gets a bonus point (which means, he gets 3 points)

I am a beginner in c# . My code fails in major cases in the calculation of scores? which is the right approach and for certain inputs I get value cannot be null.

Sample Input 1:                       

Player Name : Daisy
Player Name: Daisy
Player Name : Bill
Player Name : Bill
Player Name : Tommy
<space>

Sample output  :

Bill Score : 3
Tommy Score : 1
Daisy Score : 3

Sample Input 2:

Player Name : Tommy
Player Name : Bill
Player Name : Bill
Player Name : Daisy
<space>
Player Name : Tommy

Sample output  :
Bill Score : 3
Tommy Score : 2
Daisy Score : 1

What I have tried:

using System.IO;
using System;
using System.Collections;
using System.Linq;


class Program
{
    static void Main()
    {
        Dictionary<string,int> players = new Dictionary<string,int>();
        players.Add("Bill",0);
        players.Add("Tommy",0);
        players.Add("Daisy",0);
        int n=6;
        string[] arr = new string[6];
        for(int i=0;i<n;i++)
        {
            Console.WriteLine("Player Name : ");
            arr[i]=Console.ReadLine();
        }
        //to check consecutive chances
        for(int i=0;i<=n-2;i++)
        {
            if(arr[i]==arr[i+1])
            {
                players[arr[i]]=3;
            }
        }
        //to check missed chances
        for(int i=1;i<n;i++)
        {
            if(arr[i]==" ")
            {
                players[arr[i-1]]=1;
            }
        }
        
        //not consecutive chances taken and one chance missed
        string remainingPlayer = players.FirstOfDefault(x=> x.Value == 0).Key;
        players[remainingPlayer]=2;
        
        //printing results
        for(int count=0;count<players.Count;count++)
        {
            var element = players.ElementAt(count);
            var key = element.Key;
            var value = element.Value;
            Console.WriteLine("{0} Score : {1} ",key,value);
        }
    }
}