The content of the article

There has been a lot of discussion around these parts about unfair advantages by playing as a group in Storm League, unfortunately this was all based on anecdotal evidence.

To try and solve the problem I purchased API access to Heroes Profile and taught myself Python to see what the data tells us (all data is from 2020).

Across the sample of 8,410 Storm League games:

• 5 stacks won 53% of the time
• 4+1 stacks won 54% of the time
• 5 solo players won 48% of the time
• everyone else is at a 50% win rate

• The most common team comp is 3 solo players and a 2 stack (31% of games)
• 5 stacks are involved in 10% of games
• The matchmaker does not like putting a 2 stack and a 3 stack together (only 2% of games)

• 5 stacks are almost never matched against 5 solo players (only 5 games out of 8,410)
• 5 stacks are most often matched with 3 solo + 2 stack (48% of the time)
• 5 stacks beat other comps between 52% and 60%, except for against 4+1 stacks where they actually only win 45% of the time

• 4+1 stacks are most often matched with 3 solo + 2 stack (32% of the time), but they are also matched against 5 solo players 26% of the time, they are very rarely matched against other 4+1 stacks (3% of the time)
• 4+1 stacks beat other comps between 53% and 61% (although the 61% is a very small number of games so the figure is not reliable), except for against 1 solo player and 2x 2 stacks where they only win 39% of the time

• 3+2 stacks did not have enough games to draw reliable conclusions (2% of total games)

• 2 solo player and a 3 stack lose out to some comps but beat others to average 50% overall

• 1 solo player and 2x 2 stacks also lose out to some comps but beat others to average 50% overall

• 5 solo players most often play other teams of 5 solo players (36% of the time)
• next most common is to play against 3 solo players and a 2 stack (30% of the time) which they only win 47% of the time
• 5 solo players don't have a win advantage over any other composition

## This table shows the overall wins and loses for each composition type

Team CompositionWinLoseGames CountWin %Lose %99% Confidence% of Games
5 Stack857756161353%47%±0%10%
1 Solo Players + 4 Stack700606130654%46%±0%8%
3 Stack + 2 Stack20119940050%50%±0%2%
2 Solo Players + 3 Stack14371426286350%50%±0%17%
1 Solo Players + 2 Stack + 2 Stack677666134350%50%±0%8%
3 Solo Players + 2 Stack25442590513450%50%±0%31%
5 Solo Players19942167416148%52%±0%25%
Overall841084101682050%50%±0%100%

note: Total Games Count is double the number of matches analysed since it counts the result from each side individually

## This table shows the wins and loses for a 5 stack against each of the listed team compositions

5 Stack vs Team CompositionWinLoseGames CountWin %Lose %99% Confidence% of Games
5 Stack11811826350%50%±1%8%
1 Solo Players + 4 Stack728816045%55%±1%11%
3 Stack + 2 Stack18143256%44%±4%2%
2 Solo Players + 3 Stack17616233852%48%±0%23%
1 Solo Players + 2 Stack + 2 Stack785213060%40%±1%9%
3 Solo Players + 2 Stack39232071255%45%±0%48%
5 Solo Players32560%40%±25%0%
Overall857756161353%47%±0%100%

## This table shows the wins and loses for a 4 + 1 stack against each of the listed team compositions

1 Solo Players + 4 Stack vs Team CompositionWinLoseGames CountWin %Lose %99% Confidence% of Games
5 Stack887216055%45%±1%10%
1 Solo Players + 4 Stack42428450%50%±2%6%
3 Stack + 2 Stack22143661%39%±3%3%
2 Solo Players + 3 Stack1078419156%44%±1%15%
1 Solo Players + 2 Stack + 2 Stack426610839%61%±1%8%
3 Solo Players + 2 Stack21019040053%48%±0%31%
5 Solo Players18913832758%42%±0%25%
Overall700606130654%46%±0%100%

## This table shows the wins and loses for a 3 + 2 stack against each of the listed team compositions

3 Stack + 2 Stack vs Team CompositionWinLoseGames CountWin %Lose %99% Confidence% of Games
5 Stack14183244%56%±4%2%
1 Solo Players + 4 Stack14223639%61%±3%9%
3 Stack + 2 Stack11112250%50%±6%6%
2 Solo Players + 3 Stack43489147%53%±1%23%
1 Solo Players + 2 Stack + 2 Stack25184358%42%±3%11%
3 Solo Players + 2 Stack574510256%44%±1%26%
5 Solo Players37377450%50%±2%19%
Overall20119940050%50%±0%100%

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## This table shows the wins and loses for a 2 Solo Players + 3 stack against each of the listed team compositions

2 Solo Players + 3 Stack vs Team CompositionWinLoseGames CountWin %Lose %99% Confidence% of Games
5 Stack16217633848%52%±0%21%
1 Solo Players + 4 Stack8410719144%56%±1%7%
3 Stack + 2 Stack48439153%47%±1%3%
2 Solo Players + 3 Stack22422444850%50%±0%16%
1 Solo Players + 2 Stack + 2 Stack12912024952%48%±1%9%
3 Solo Players + 2 Stack41041282250%50%±0%29%
5 Solo Players38034472452%48%±0%25%
Overall14371426286350%50%±0%100%

## This table shows the wins and loses for a 1 Solo Player + 2 stack + 2 stack against each of the listed team compositions

1 Solo Player + 2 stack + 2 Stack vs Team CompositionWinLoseGames CountWin %Lose %99% Confidence% of Games
5 Stack527813040%60%±1%8%
1 Solo Players + 4 Stack664210861%39%±1%8%
3 Stack + 2 Stack18254342%58%±3%3%
2 Solo Players + 3 Stack12012924948%52%±1%19%
1 Solo Players + 2 Stack + 2 Stack838316650%50%±1%12%
3 Solo Players + 2 Stack19017936951%49%±0%27%
5 Solo Players14813027853%47%±0%21%
Overall677666134350%50%±0%100%

## This table shows the wins and loses for a 3 Solo Players + 2 stack against each of the listed team compositions

3 Solo Players + 2 Stack vs Team CompositionWinLoseGames CountWin %Lose %99% Confidence% of Games
5 Stack32039271245%55%±0%44%
1 Solo Players + 4 Stack19021040048%53%±0%8%
3 Stack + 2 Stack455710244%56%±1%2%
2 Solo Players + 3 Stack41241082250%50%±0%16%
1 Solo Players + 2 Stack + 2 Stack17919036949%51%±0%7%
3 Solo Players + 2 Stack732732146450%50%±0%29%
5 Solo Players666599126553%47%±0%25%
Overall25442590513450%50%±0%100%

## This table shows the wins and loses for a 5 Solo Players against each of the listed team compositions

5 Solo Players vs Team CompositionWinLoseGames CountWin %Lose %99% Confidence% of Games
5 Stack23540%60%±25%0%
1 Solo Players + 4 Stack13818932742%58%±0%8%
3 Stack + 2 Stack37377450%50%±2%2%
2 Solo Players + 3 Stack34438072448%52%±0%17%
1 Solo Players + 2 Stack + 2 Stack13014827847%53%±0%7%
3 Solo Players + 2 Stack599666126547%53%±0%30%
5 Solo Players744744148850%50%±0%36%
Overall19942167416148%52%±0%100%

So there are the figures, let the arguments commence.

Note – I retyped the figures above manually, so if anything doesn't add up I probably mistyped, but let me know and I will fix.