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    As it reads

    1. Select each number and it's index (0 based position) in the list
    2. If current number equal to previous number in List (ignoring index 0 because no previous number) add null entry to new returned enumerable
    3. Else [Implied If current number not equal to previous number - i.e. beginning of new sequence] Skip(i) amount of elements up to current position and Take() the next value in this sub-enumerable While() next value is equal to current value in the outer enumerable and Sum() them together
    4. Filter out nulls
    5. Select values
    6. Convert to List for return type

    {1,4,4,4,0,4,3,3,1} becomes:
    {1,12,null,null,0,4,6,null,1}

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    This comment is hidden because it contains spoiler information about the solution

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    I'm confused how this solution doesn't produce {1,12,8,4,0,4,6,3,1} for Input: {1,4,4,4,0,4,3,3,1} but I couldn't figure out any one liner so what do I know.

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    I was getting this due to code running longer than the timeout

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    Test's don't really match expectations based on instructions.

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    Test Cases Incorrect for Submission - Console.WriteLine'd out on C# Test
    The instructions do not specify any race is a ZERO value, and Tests within the ShouldBeATie Section show that the zeros do not count towards score:
    Good: 1 0 0 0 0 0
    Evil: 1 0 0 0 0 0 0 (From ShouldBeATie)
    Cannot make all tests pass by accounting for 0 value or not!

    Time: 671ms Passed: 3 Failed: 3
    Test Results:
    GoodVsEvil
    EvilShouldWin
    Log
    Good: 1 1 1 1 1 1
    Evil: 1 1 1 1 1 1 1
    Good: 1 1 1 1 1 1 -- Is not EvilShouldWin (Is Infact a Draw)
    Evil: 0 1 1 1 1 1 1 -- Is not EvilShouldWin (Is Infact a Draw)
    ✔ 1 assertion passed
    ✘ Expected string length 48 but was 45. Strings differ at index 15.
    Expected: "Battle Result: Evil eradicates all trace of Good"
    But was: "Battle Result: No victor on this battle field"
    --------------------------^
    Completed in 0.026539ms
    GoodShouldTriumph
    Log
    Good: 0 0 0 0 0 10
    Evil: 0 1 1 1 1 0 0
    Good: 1 1 1 1 1 1
    Evil: 0 0 1 1 1 1 1
    Good: 0 1 0 0 0 0 -- Is not GoodShouldTriupmh (Is Infact a Draw)
    Evil: 1 0 0 0 0 0 0 -- Is not GoodShouldTriupmh (Is Infact a Draw)
    ✔ 2 assertions passed
    ✘ Expected string length 38 but was 45. Strings differ at index 15.
    Expected: "Battle Result: Good triumphs over Evil"
    But was: "Battle Result: No victor on this battle field"
    --------------------------^
    Completed in 0.00101ms
    ShouldBeATie
    Log
    Good: 1 0 0 0 0 0
    Evil: 1 0 0 0 0 0 0
    Good: 0 0 0 0 0 0
    Evil: 0 0 0 0 0 0 0
    Good: 1 1 1 1 1 1
    Evil: 1 0 1 1 1 1 1
    Good: 1 0 0 0 0 0
    Evil: 1 0 0 0 0 0 0
    Good: 0 1 0 0 0 0
    Evil: 0 1 0 0 0 0 0
    Good: 0 1 0 0 0 0
    Evil: 0 0 1 0 0 0 0
    Good: 0 1 0 0 0 0
    Evil: 0 0 0 1 0 0 0
    Good: 0 0 1 0 0 0
    Evil: 0 0 0 0 1 0 0
    Good: 0 0 0 1 0 0
    Evil: 0 0 0 0 1 0 0
    Good: 1 0 0 0 1 0 -- Not A Tie (Good Wins)
    Evil: 0 0 0 0 0 1 0 -- Not A Tie (Good Wins)
    ✔ 9 assertions passed
    ✘ Expected string length 45 but was 38. Strings differ at index 15.
    Expected: "Battle Result: No victor on this battle field"
    But was: "Battle Result: Good triumphs over Evil"
    --------------------------^
    Completed in 0.000577ms