Recently, I heard about the Chess Mine having a challenge declined on the basis that they had strong suspicions that this team's moves were influenced by engine output. I defended this claim based on the statistically inadequate evidence provided, and this led to me to analyse this group's games in the same way as I have many times for daily chess players (several of whom have been then booted for fair play violations after chess.com did much more thorough analysis).

So, what does an analysis of the entire play of this group say? Here is the summary output of @MGleason's program for identifying suspect players for reporting, using a well-known chess engine with a modest amount of time to calculate.

It is very important to note that only unclear positions after the opening are included in these analyses. Also that the T1-T2-T3 stats are only for a smaller number of positions where there are enough moves that have computer evaluations within a small difference of each other for there to a close choice. There are multiple moves with less than half a pawn difference (can be a lot less) according to the engine.

The Chess Mine, 85 games

UNDECIDED POSITIONS
Positions: 884
T1: 279/488; 57.17% (std error 2.24)
T2: 248/288; 86.11% (std error 2.04)
T3: 210/232; 90.52% (std error 1.92)
=0 CP loss: 685/884; 77.49% (std error 1.40)
>0 CP loss: 199/884; 22.51% (std error 1.40)
>10 CP loss: 88/884; 9.95% (std error 1.01)
>25 CP loss: 25/884; 2.83% (std error 0.56)
>50 CP loss: 3/884; 0.34% (std error 0.20)
>100 CP loss: 0/884; 0.00% (std error 0.00)
>200 CP loss: 0/884; 0.00% (std error 0.00)
>500 CP loss: 0/884; 0.00% (std error 0.00)
CP loss mean 2.92, std deviation 8.29

LOSING POSITIONS
Positions: 0

For comparison, here is the analysis of 94 recent standard time control games by a guy called Magnus Carlsen.

[EDITED: I have replaced Carlsen's analysis with the version where database moves are deleted]

Carlsen, Magnus, 80 games

UNDECIDED POSITIONS
Positions: 937
T1: 380/770; 49.35% (std error 1.80)
T2: 463/676; 68.49% (std error 1.79)
T3: 504/623; 80.90% (std error 1.57)
=0 CP loss: 648/937; 69.16% (std error 1.51)
>0 CP loss: 289/937; 30.84% (std error 1.51)
>10 CP loss: 164/937; 17.50% (std error 1.24)
>25 CP loss: 67/937; 7.15% (std error 0.84)
>50 CP loss: 29/937; 3.09% (std error 0.57)
>100 CP loss: 5/937; 0.53% (std error 0.24)
>200 CP loss: 1/937; 0.11% (std error 0.11)
>500 CP loss: 1/937; 0.11% (std error 0.11)
CP loss mean 7.10, std deviation 28.72

LOSING POSITIONS
Positions: 17
T1: 7/9; 77.78% (std error 13.86)
T2: 6/7; 85.71% (std error 13.23)
T3: 7/7; 100.00% (std error 0.00)
=0 CP loss: 13/17; 76.47% (std error 10.29)
>0 CP loss: 4/17; 23.53% (std error 10.29)
>10 CP loss: 3/17; 17.65% (std error 9.25)
>25 CP loss: 2/17; 11.76% (std error 7.81)
>50 CP loss: 2/17; 11.76% (std error 7.81)
>100 CP loss: 2/17; 11.76% (std error 7.81)
>200 CP loss: 1/17; 5.88% (std error 5.71)
>500 CP loss: 0/17; 0.00% (std error 0.00)
CP loss mean 30.76, std deviation 89.02

The Chess Mine

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