Taking a harder look at play by depth and variety - some test results after round of update. Version  13.1b, soon to be minor release ..
Depth 16  versus Depth 14, using opening book (required here or you would just have 1000 identical games)) , no variety (focus on the Elo difference ,not the absolute rating):
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PGN File: c:/cluster.mfb/pgn/04211337.pgn
Time Control: Time Control-> base+inc: 54+0.540
Games: 1000
Threads: 1
Hash: 128
Current date : time (EDST)
Date: 04/21/21 : 13:52:21
Projected-> Time: 1h:27m:7s
     Run -> Time: 0h:14m:37s
1000 game(s) loaded
Iteration 100: 0.000125191
Rank Name               Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR
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   1 Bluefish-13.1-d16   3553   0.0    9    9  1000  671.5  67.2  372   29  599  37.2  59.9  3447
   2 Bluefish-13.1-d14   3447 106.7    9    9  1000  328.5  32.9   29  372  599   2.9  59.9  3553
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  Δ = delta from the next higher rated opponent
  # = number of games played
  Σ = total score, 1 point for win, 1/2 point for draw
LOS:
                   Bl Bl
Bluefish-13.1-D16    100
Bluefish-13.1-d14   0
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Depth 14 , versus Depth 20 with variety, no opening book used)
Code: Select all
PGN File: c:/cluster.mfb/pgn/04212042.pgn
Time Control: Time Control-> base+inc: 300+2.000
Games: 250
Threads: 1
Hash: 128
Current date : time (EDST)
Date: 04/21/21 : 21:45:40
Projected-> Time: 1h:55m:45s
     Run -> Time: 1h:3m:35s
250 game(s) loaded
Rank Name                   Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR
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   1 Bluefish-13.1-d14       3520   0.0   30   30   250  139.5  55.8   77   48  125  30.8  50.0  3480
   2 Bluefish-v13.1-d20var   3480  40.8   30   30   250  110.5  44.2   48   77  125  19.2  50.0  3520
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  Δ = delta from the next higher rated opponent
  # = number of games played
  Σ = total score, 1 point for win, 1/2 point for draw
LOS:
                       Bl Bl
Bluefish-13.1-d14         99
Bluefish-v13.1-d20var   0
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Depth 16v with variety versus Depth 12 no opening book 
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###                                              Summary                                              ###
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PGN File: c:/cluster.mfb/pgn/04211036.pgn
Time Control: Time Control-> base+inc: 54+0.540
Games: 1000
Threads: 1
Hash: 128
Current date : time (EDST)
Date: 04/21/21 : 11:28:22
Projected-> Time: 1h:27m:7s
     Run -> Time: 0h:52m:12s
1000 game(s) loaded
Rank Name               Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR
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   1 Bluefish-13.1-d12   3521   0.0   16   16  1000  560.5  56.0  337  216  447  33.7  44.7  3479
   2 Bluefish-13.1-d16var   3479  42.4   16   16  1000  439.5  44.0  216  337  447  21.6  44.7  3521
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  Δ = delta from the next higher rated opponent
  # = number of games played
  Σ = total score, 1 point for win, 1/2 point for draw
LOS:
                   Bl Bl
Bluefish-13.1-d12     99
Bluefish-13.1-d16var   0
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Depth 14  vs Depth 12 , with opening book (required) 
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###                                              Summary                                              ###
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PGN File: c:/cluster.mfb/pgn/04211300.pgn
Time Control: Time Control-> base+inc: 54+0.540
Games: 1000
Threads: 1
Hash: 128
Current date : time (EDST)
Date: 04/21/21 : 13:06:22
Projected-> Time: 1h:27m:7s
     Run -> Time: 0h:6m:20s
1000 game(s) loaded
Rank Name               Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR
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   1 Bluefish-13.1-d14   3568   0.0   12   12  1000  703.0  70.3  451   45  504  45.1  50.4  3432
   2 Bluefish-13.1-d12   3432 135.9   12   12  1000  297.0  29.7   45  451  504   4.5  50.4  3568
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  Δ = delta from the next higher rated opponent
  # = number of games played
  Σ = total score, 1 point for win, 1/2 point for draw
LOS:
                   Bl Bl
Bluefish-13.1-d14    100
Bluefish-13.1-d12   0
depth 20 versus Depth 16, opening book (required)
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Deopth 20 vs D16 , opening book required)
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Rank Name               Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR 
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   1 Bluefish-13.1-d20   3543   0.0    5    5  1000  682.5  68.2  372    7  621  37.2  62.1  3457 
   2 Bluefish-13.1.d16   3457  86.7    5    5  1000  317.5  31.8    7  372  621   0.7  62.1  3543 
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  Δ = delta from the next higher rated opponent
  # = number of games played
  Σ = total score, 1 point for win, 1/2 point for draw
LOS:
                   Bl Bl
Bluefish-13.1-d20    100
Bluefish-13.1.d16   0