Experience Book Eval Importance

deeds · Post by **deeds** » Fri Aug 25, 2023 6:52 am

10% = setoption name Experience Book Eval Importance value 1
20% = setoption name Experience Book Eval Importance value 2
...

hardware : dual xeon e5-2660v3, 40 threads, hash 4 GB
software : Arena 3.5.1, TC 1m+1s, partial syzygy 7men
engine : Eman 8.40 played with nn-e1fb1ade4432.nnue net
experience data : Depth4_180423.exp (Experience Read Only true, Experience Book true, Experience Book Min Depth 27, Experience Book Max Moves 100)

opening list : startpos

Code: Select all

   # PLAYER                                   :  RATING  ERROR  POINTS  PLAYED   (%)    W    D    L  D(%)  OppAvg  OppN
   1 20%-D27 Depth4_180423.exp (Eman 8.40)    :       8     62    59.0     112  52.7    6  106    0  94.6     -11     8
   2 10%-D27 Depth4_180423.exp (Eman 8.40)    :       6     61    58.5     112  52.2    5  107    0  95.5     -10     8
   3 40%-D27 Depth4_180423.exp (Eman 8.40)    :       3     64    58.0     112  51.8    4  108    0  96.4     -10     8
   4 30%-D27 Depth4_180423.exp (Eman 8.40)    :       3     63    58.0     112  51.8    4  108    0  96.4     -10     8
   5 50%-D27 Depth4_180423.exp (Eman 8.40)    :       0   ----    57.5     112  51.3    3  109    0  97.3     -10     8 <= Khalid's default settings for tourneys
   6 60%-D27 Depth4_180423.exp (Eman 8.40)    :       0     63    57.5     112  51.3    3  109    0  97.3     -10     8
   7 80%-D27 Depth4_180423.exp (Eman 8.40)    :      -6     61    56.5     112  50.4    4  105    3  93.8      -9     8
   8 70%-D27 Depth4_180423.exp (Eman 8.40)    :      -8     64    56.0     112  50.0    5  102    5  91.1      -9     8
   9 90%-D27 Depth4_180423.exp (Eman 8.40)    :     -83     66    43.0     112  38.4    0   86   26  76.8       1     8

White advantage = 23.98 +/- 11.06
Draw rate (equal opponents) = 50.00 % +/- 0.00

Code: Select all

009 players                       : avg. D35, 001 417 ms/move, 000 504 games, 00 045 589 moves

10%-d27 depth4_180423 (eman 8.40) : avg. D35, 001 384 ms/move, 000 112 games, 00 005 113 moves
20%-d27 depth4_180423 (eman 8.40) : avg. D36, 001 380 ms/move, 000 112 games, 00 005 170 moves
30%-d27 depth4_180423 (eman 8.40) : avg. D37, 001 444 ms/move, 000 112 games, 00 004 700 moves
40%-d27 depth4_180423 (eman 8.40) : avg. D38, 001 415 ms/move, 000 112 games, 00 004 949 moves
50%-d27 depth4_180423 (eman 8.40) : avg. D38, 001 474 ms/move, 000 112 games, 00 004 697 moves <= Khalid's default settings for tourneys
60%-d27 depth4_180423 (eman 8.40) : avg. D36, 001 459 ms/move, 000 112 games, 00 004 956 moves
70%-d27 depth4_180423 (eman 8.40) : avg. D34, 001 460 ms/move, 000 112 games, 00 004 875 moves
80%-d27 depth4_180423 (eman 8.40) : avg. D35, 001 474 ms/move, 000 112 games, 00 004 696 moves
90%-d27 depth4_180423 (eman 8.40) : avg. D29, 001 305 ms/move, 000 112 games, 00 006 433 moves

Averages :
0 128 sec/game (2 min/game)
094 plies/game (090 played plies/game)

Game stages :
- opening @ avg. D37, 001 046 ms/move
- middleg @ avg. D30, 001 804 ms/move
- endgame @ avg. D38, 001 449 ms/move

link : games
only for family, friends and customers (request password and information by PM)

deeds · Post by **deeds** » Fri Aug 25, 2023 7:38 am

CONFORMITY WITH EXPERIENCE

10%-d27 depth4_180423.exp (eman 8.40) : 87% (1469 moves), longest = 18 moves
20%-d27 depth4_180423.exp (eman 8.40) : 85% (1453 moves), longest = 18 moves
30%-d27 depth4_180423.exp (eman 8.40) : 86% (1594 moves), longest = 16 moves
40%-d27 depth4_180423.exp (eman 8.40) : 77% (1094 moves), longest = 18 moves
50%-d27 depth4_180423.exp (eman 8.40) : 78% (1094 moves), longest = 19 moves <= Khalid's default settings for tourneys
60%-d27 depth4_180423.exp (eman 8.40) : 80% (1221 moves), longest = 19 moves
70%-d27 depth4_180423.exp (eman 8.40) : 75% (959 moves), longest = 9 moves
80%-d27 depth4_180423.exp (eman 8.40) : 67% (713 moves), longest = 7 moves
90%-d27 depth4_180423.exp (eman 8.40) : 66% (679 moves), longest = 3 moves

deeds · Post by **deeds** » Tue Aug 29, 2023 6:40 am

10% = setoption name Experience Book Eval Importance value 1
20% = setoption name Experience Book Eval Importance value 2
etc.
50%-D27... <= Khalid's default settings for tourneys

hardware : dual xeon e5-2660v3, 40 threads, hash 4 GB
software : Arena 3.5.1, TC 1m+1s, partial syzygy 7men
engine : Eman 8.40 played with nn-e1fb1ade4432.nnue net
experience data : Rulleeeee_030523.exp (Experience Read Only true, Experience Book true, Experience Book Min Depth 27, Experience Book Max Moves 100)

opening list : startpos

ORDO

Code: Select all

   # PLAYER                                      :  RATING  ERROR  POINTS  PLAYED   (%)    W    D    L   D(%)  OppAvg  OppN
   1 10%-D27 Rulleeeee_030523.exp (Eman 8.40)    :       0    181     8.0      16  50.0    0   16    0  100.0       0     8
   2 70%-D27 Rulleeeee_030523.exp (Eman 8.40)    :       0    178     8.0      16  50.0    0   16    0  100.0       0     8
   3 30%-D27 Rulleeeee_030523.exp (Eman 8.40)    :       0    173     8.0      16  50.0    0   16    0  100.0       0     8
   4 50%-D27 Rulleeeee_030523.exp (Eman 8.40)    :       0   ----     8.0      16  50.0    0   16    0  100.0       0     8
   5 40%-D27 Rulleeeee_030523.exp (Eman 8.40)    :       0    173     8.0      16  50.0    0   16    0  100.0       0     8
   6 90%-D27 Rulleeeee_030523.exp (Eman 8.40)    :       0    180     8.0      16  50.0    0   16    0  100.0       0     8
   7 80%-D27 Rulleeeee_030523.exp (Eman 8.40)    :       0    172     8.0      16  50.0    0   16    0  100.0       0     8
   8 20%-D27 Rulleeeee_030523.exp (Eman 8.40)    :       0    175     8.0      16  50.0    0   16    0  100.0       0     8
   9 60%-D27 Rulleeeee_030523.exp (Eman 8.40)    :       0    178     8.0      16  50.0    0   16    0  100.0       0     8

White advantage = 0.00 +/- 30.99
Draw rate (equal opponents) = 50.00 % +/- 0.00

STATISTICS

Code: Select all

009 players                          : avg. D40, 001 384 ms/move, 000 072 games, 00 005 687 moves

10%-d27 rulleeeee_030523 (eman 8.40) : avg. D39, 001 396 ms/move, 000 016 games, 00 000 621 moves
20%-d27 rulleeeee_030523 (eman 8.40) : avg. D40, 001 377 ms/move, 000 016 games, 00 000 621 moves
30%-d27 rulleeeee_030523 (eman 8.40) : avg. D39, 001 453 ms/move, 000 016 games, 00 000 662 moves
40%-d27 rulleeeee_030523 (eman 8.40) : avg. D39, 001 449 ms/move, 000 016 games, 00 000 593 moves
50%-d27 rulleeeee_030523 (eman 8.40) : avg. D44, 001 122 ms/move, 000 016 games, 00 000 616 moves
60%-d27 rulleeeee_030523 (eman 8.40) : avg. D42, 001 266 ms/move, 000 016 games, 00 000 658 moves
70%-d27 rulleeeee_030523 (eman 8.40) : avg. D40, 001 435 ms/move, 000 016 games, 00 000 699 moves
80%-d27 rulleeeee_030523 (eman 8.40) : avg. D40, 001 479 ms/move, 000 016 games, 00 000 639 moves
90%-d27 rulleeeee_030523 (eman 8.40) : avg. D38, 001 478 ms/move, 000 016 games, 00 000 578 moves

Averages :
0 109 sec/game (2 min/game)
081 plies/game (079 played plies/game)

Game stages :
- opening @ avg. D44, 000 447 ms/move
- middleg @ avg. D34, 001 910 ms/move
- endgame @ avg. D41, 001 845 ms/move

CONFORMITY WITH EXPERIENCE

10%-d27 rulleeeee_030523.exp (eman 8.40) : 96% (105 moves), longest = 8 moves
20%-d27 rulleeeee_030523.exp (eman 8.40) : 96% (105 moves), longest = 8 moves
30%-d27 rulleeeee_030523.exp (eman 8.40) : 96% (105 moves), longest = 8 moves
40%-d27 rulleeeee_030523.exp (eman 8.40) : 100% (88 moves), longest = 17 moves
50%-d27 rulleeeee_030523.exp (eman 8.40) : 91% (140 moves), longest = 12 moves
60%-d27 rulleeeee_030523.exp (eman 8.40) : 84% (95 moves), longest = 12 moves
70%-d27 rulleeeee_030523.exp (eman 8.40) : 86% (122 moves), longest = 17 moves
80%-d27 rulleeeee_030523.exp (eman 8.40) : 84% (116 moves), longest = 13 moves
90%-d27 rulleeeee_030523.exp (eman 8.40) : 62% (74 moves), longest = 13 moves

link : games
only for family, friends and customers (request password and information by PM)

deeds · Post by **deeds** » Tue Aug 29, 2023 6:53 am

10% = setoption name Experience Book Eval Importance value 1
20% = setoption name Experience Book Eval Importance value 2
etc.
50%-D27... <= Khalid's default settings for tourneys

hardware : dual xeon e5-2660v3, 40 threads, hash 4 GB
software : Arena 3.5.1, TC 1m+1s, partial syzygy 7men
engine : Eman 8.40 played with nn-e1fb1ade4432.nnue net
experience data : Cubail_250623.exp (Experience Read Only true, Experience Book true, Experience Book Min Depth 27, Experience Book Max Moves 100)

opening list : startpos

ORDO

Code: Select all

   # PLAYER                                   :  RATING  ERROR  POINTS  PLAYED   (%)    W    D    L   D(%)  OppAvg  OppN
   1 40%-D27 Cubail_250623.exp (Eman 8.40)    :      20    172     8.5      16  53.1    1   15    0   93.8      -2     8
   2 10%-D27 Cubail_250623.exp (Eman 8.40)    :       0    181     8.0      16  50.0    0   16    0  100.0       0     8
   3 70%-D27 Cubail_250623.exp (Eman 8.40)    :       0    178     8.0      16  50.0    0   16    0  100.0       0     8
   4 30%-D27 Cubail_250623.exp (Eman 8.40)    :       0    172     8.0      16  50.0    0   16    0  100.0       0     8
   5 60%-D27 Cubail_250623.exp (Eman 8.40)    :       0    177     8.0      16  50.0    0   16    0  100.0       0     8
   6 50%-D27 Cubail_250623.exp (Eman 8.40)    :       0   ----     8.0      16  50.0    0   16    0  100.0       0     8
   7 80%-D27 Cubail_250623.exp (Eman 8.40)    :       0    171     8.0      16  50.0    0   16    0  100.0       0     8
   8 20%-D27 Cubail_250623.exp (Eman 8.40)    :       0    172     8.0      16  50.0    0   16    0  100.0       0     8
   9 90%-D27 Cubail_250623.exp (Eman 8.40)    :     -20    178     7.5      16  46.9    0   15    1   93.8       2     8

White advantage = 4.88 +/- 30.96
Draw rate (equal opponents) = 50.00 % +/- 0.00

STATISTICS

Code: Select all

009 players                       : avg. D40, 001 451 ms/move, 000 072 games, 00 006 213 moves

10%-d27 cubail_250623 (eman 8.40) : avg. D47, 000 898 ms/move, 000 016 games, 00 000 756 moves
20%-d27 cubail_250623 (eman 8.40) : avg. D39, 001 592 ms/move, 000 016 games, 00 000 669 moves
30%-d27 cubail_250623 (eman 8.40) : avg. D39, 001 582 ms/move, 000 016 games, 00 000 686 moves
40%-d27 cubail_250623 (eman 8.40) : avg. D39, 001 524 ms/move, 000 016 games, 00 000 708 moves
50%-d27 cubail_250623 (eman 8.40) : avg. D41, 001 579 ms/move, 000 016 games, 00 000 665 moves
60%-d27 cubail_250623 (eman 8.40) : avg. D40, 001 608 ms/move, 000 016 games, 00 000 658 moves
70%-d27 cubail_250623 (eman 8.40) : avg. D41, 001 387 ms/move, 000 016 games, 00 000 653 moves
80%-d27 cubail_250623 (eman 8.40) : avg. D40, 001 384 ms/move, 000 016 games, 00 000 675 moves
90%-d27 cubail_250623 (eman 8.40) : avg. D37, 001 563 ms/move, 000 016 games, 00 000 743 moves

Averages :
0 125 sec/game (2 min/game)
089 plies/game (086 played plies/game)

Game stages :
- opening @ avg. D45, 001 107 ms/move
- middleg @ avg. D34, 002 323 ms/move
- endgame @ avg. D41, 001 660 ms/move

CONFORMITY WITH EXPERIENCE

10%-d27 cubail_250623.exp (eman 8.40) : 93% (170 moves), longest = 9 moves
20%-d27 cubail_250623.exp (eman 8.40) : 99% (186 moves), longest = 23 moves
30%-d27 cubail_250623.exp (eman 8.40) : 99% (198 moves), longest = 23 moves
40%-d27 cubail_250623.exp (eman 8.40) : 98% (205 moves), longest = 24 moves
50%-d27 cubail_250623.exp (eman 8.40) : 99% (184 moves), longest = 23 moves
60%-d27 cubail_250623.exp (eman 8.40) : 99% (215 moves), longest = 24 moves
70%-d27 cubail_250623.exp (eman 8.40) : 98% (183 moves), longest = 23 moves
80%-d27 cubail_250623.exp (eman 8.40) : 92% (198 moves), longest = 24 moves
90%-d27 cubail_250623.exp (eman 8.40) : 86% (168 moves), longest = 8 moves

link : games
only for family, friends and customers (request password and information by PM)

deeds · Post by **deeds** » Thu Aug 31, 2023 12:13 pm

10% = setoption name Experience Book Eval Importance value 1
20% = setoption name Experience Book Eval Importance value 2
etc.
50%-D27... <= Khalid's default settings for tourneys

hardware : dual xeon e5-2660v3, 40 threads, hash 4 GB
software : Arena 3.5.1, TC 1m+1s, partial syzygy 7men
engine : Eman 8.40 played with nn-e1fb1ade4432.nnue net
experience data : Khalid_210122.exp (Experience Read Only true, Experience Book true, Experience Book Min Depth 27, Experience Book Max Moves 100)

opening list : startpos

ORDO

Code: Select all

   # PLAYER                                   :  RATING  ERROR  POINTS  PLAYED   (%)    W    D    L   D(%)  OppAvg  OppN
   1 50%-D27 Khalid_210122.exp (Eman 8.40)    :       0   ----    17.5      32  54.7    3   29    0   90.6     -34     8
   2 10%-D27 Khalid_210122.exp (Eman 8.40)    :     -10    119    17.0      32  53.1    2   30    0   93.8     -33     8
   3 60%-D27 Khalid_210122.exp (Eman 8.40)    :     -10    125    17.0      32  53.1    2   30    0   93.8     -33     8
   4 20%-D27 Khalid_210122.exp (Eman 8.40)    :     -10    119    17.0      32  53.1    2   30    0   93.8     -33     8
   5 40%-D27 Khalid_210122.exp (Eman 8.40)    :     -10    121    17.0      32  53.1    2   30    0   93.8     -33     8
   6 30%-D27 Khalid_210122.exp (Eman 8.40)    :     -10    122    17.0      32  53.1    2   30    0   93.8     -33     8
   7 70%-D27 Khalid_210122.exp (Eman 8.40)    :     -30    120    16.0      32  50.0    0   32    0  100.0     -30     8
   8 80%-D27 Khalid_210122.exp (Eman 8.40)    :     -50    119    15.0      32  46.9    0   30    2   93.8     -28     8
   9 90%-D27 Khalid_210122.exp (Eman 8.40)    :    -143    128    10.5      32  32.8    0   21   11   65.6     -16     8

White advantage = 32.71 +/- 21.56
Draw rate (equal opponents) = 50.00 % +/- 0.00

STATISTICS

Code: Select all

009 players                       : avg. D43, 000 937 ms/move, 000 144 games, 00 013 157 moves

10%-d27 khalid_210122 (eman 8.40) : avg. D46, 000 916 ms/move, 000 032 games, 00 001 360 moves
20%-d27 khalid_210122 (eman 8.40) : avg. D45, 000 880 ms/move, 000 032 games, 00 001 435 moves
30%-d27 khalid_210122 (eman 8.40) : avg. D44, 000 937 ms/move, 000 032 games, 00 001 498 moves
40%-d27 khalid_210122 (eman 8.40) : avg. D45, 000 684 ms/move, 000 032 games, 00 001 432 moves
50%-d27 khalid_210122 (eman 8.40) : avg. D46, 000 649 ms/move, 000 032 games, 00 001 404 moves
60%-d27 khalid_210122 (eman 8.40) : avg. D46, 000 632 ms/move, 000 032 games, 00 001 365 moves
70%-d27 khalid_210122 (eman 8.40) : avg. D46, 000 986 ms/move, 000 032 games, 00 001 314 moves
80%-d27 khalid_210122 (eman 8.40) : avg. D41, 001 301 ms/move, 000 032 games, 00 001 539 moves
90%-d27 khalid_210122 (eman 8.40) : avg. D32, 001 307 ms/move, 000 032 games, 00 001 810 moves

Averages :
0 086 sec/game (1 min/game)
095 plies/game (091 played plies/game)

Game stages :
- opening @ avg. D46, 000 578 ms/move
- middleg @ avg. D41, 001 177 ms/move
- endgame @ avg. D42, 001 738 ms/move

CONFORMITY WITH EXPERIENCE

10%-d27 khalid_210122.exp (eman 8.40) : 92% (716 moves), longest = 18 moves
20%-d27 khalid_210122.exp (eman 8.40) : 92% (714 moves), longest = 18 moves
30%-d27 khalid_210122.exp (eman 8.40) : 93% (723 moves), longest = 18 moves
40%-d27 khalid_210122.exp (eman 8.40) : 92% (727 moves), longest = 18 moves
50%-d27 khalid_210122.exp (eman 8.40) : 92% (774 moves), longest = 18 moves
60%-d27 khalid_210122.exp (eman 8.40) : 92% (741 moves), longest = 18 moves
70%-d27 khalid_210122.exp (eman 8.40) : 92% (759 moves), longest = 28 moves
80%-d27 khalid_210122.exp (eman 8.40) : 91% (563 moves), longest = 27 moves
90%-d27 khalid_210122.exp (eman 8.40) : 85% (347 moves), longest = 27 moves

link : games
only for family, friends and customers (request password and information by PM)

deeds · Post by **deeds** » Sat Sep 02, 2023 4:16 pm

10% = setoption name Experience Book Eval Importance value 1
20% = setoption name Experience Book Eval Importance value 2
etc.
50%-D27... <= Khalid's default settings for tourneys

hardware : dual xeon e5-2660v3, 40 threads, hash 4 GB
software : Arena 3.5.1, TC 1m+1s, partial syzygy 7men
engine : Eman 8.40 played with nn-e1fb1ade4432.nnue net
experience data : ProteusSF_280722.exp (Experience Read Only true, Experience Book true, Experience Book Min Depth 27, Experience Book Max Moves 100)

opening list : startpos

ORDO

Code: Select all

   # PLAYER                                      :  RATING  ERROR  POINTS  PLAYED   (%)    W    D    L   D(%)  OppAvg  OppN
   1 10%-D27 ProteusSF_280722.exp (Eman 8.40)    :       0    181     8.0      16  50.0    0   16    0  100.0       0     8
   2 70%-D27 ProteusSF_280722.exp (Eman 8.40)    :       0    178     8.0      16  50.0    0   16    0  100.0       0     8
   3 30%-D27 ProteusSF_280722.exp (Eman 8.40)    :       0    173     8.0      16  50.0    0   16    0  100.0       0     8
   4 50%-D27 ProteusSF_280722.exp (Eman 8.40)    :       0   ----     8.0      16  50.0    0   16    0  100.0       0     8
   5 40%-D27 ProteusSF_280722.exp (Eman 8.40)    :       0    173     8.0      16  50.0    0   16    0  100.0       0     8
   6 90%-D27 ProteusSF_280722.exp (Eman 8.40)    :       0    180     8.0      16  50.0    0   16    0  100.0       0     8
   7 80%-D27 ProteusSF_280722.exp (Eman 8.40)    :       0    172     8.0      16  50.0    0   16    0  100.0       0     8
   8 20%-D27 ProteusSF_280722.exp (Eman 8.40)    :       0    175     8.0      16  50.0    0   16    0  100.0       0     8
   9 60%-D27 ProteusSF_280722.exp (Eman 8.40)    :       0    178     8.0      16  50.0    0   16    0  100.0       0     8

White advantage = 0.00 +/- 30.99
Draw rate (equal opponents) = 50.00 % +/- 0.00

STATISTICS

Code: Select all

009 players                          : avg. D33, 001 693 ms/move, 000 072 games, 00 006 221 moves

10%-d27 proteussf_280722 (eman 8.40) : avg. D33, 001 718 ms/move, 000 016 games, 00 000 689 moves
20%-d27 proteussf_280722 (eman 8.40) : avg. D32, 001 641 ms/move, 000 016 games, 00 000 766 moves
30%-d27 proteussf_280722 (eman 8.40) : avg. D32, 001 698 ms/move, 000 016 games, 00 000 746 moves
40%-d27 proteussf_280722 (eman 8.40) : avg. D32, 001 706 ms/move, 000 016 games, 00 000 732 moves
50%-d27 proteussf_280722 (eman 8.40) : avg. D35, 001 722 ms/move, 000 016 games, 00 000 623 moves
60%-d27 proteussf_280722 (eman 8.40) : avg. D34, 001 732 ms/move, 000 016 games, 00 000 649 moves
70%-d27 proteussf_280722 (eman 8.40) : avg. D34, 001 646 ms/move, 000 016 games, 00 000 686 moves
80%-d27 proteussf_280722 (eman 8.40) : avg. D34, 001 680 ms/move, 000 016 games, 00 000 663 moves
90%-d27 proteussf_280722 (eman 8.40) : avg. D34, 001 705 ms/move, 000 016 games, 00 000 667 moves

Averages :
0 146 sec/game (2 min/game)
089 plies/game (086 played plies/game)

Game stages :
- opening @ avg. D36, 001 197 ms/move
- middleg @ avg. D29, 002 723 ms/move
- endgame @ avg. D36, 001 451 ms/move

CONFORMITY WITH EXPERIENCE

10%-d27 ProteusSF_280722.exp (eman 8.40) : 91% (152 moves), longest = 16 moves
20%-d27 ProteusSF_280722.exp (eman 8.40) : 91% (173 moves), longest = 16 moves
30%-d27 ProteusSF_280722.exp (eman 8.40) : 90% (188 moves), longest = 16 moves
40%-d27 ProteusSF_280722.exp (eman 8.40) : 91% (183 moves), longest = 16 moves
50%-d27 ProteusSF_280722.exp (eman 8.40) : 98% (166 moves), longest = 16 moves
60%-d27 ProteusSF_280722.exp (eman 8.40) : 98% (158 moves), longest = 16 moves
70%-d27 ProteusSF_280722.exp (eman 8.40) : 98% (168 moves), longest = 16 moves
80%-d27 ProteusSF_280722.exp (eman 8.40) : 75% (114 moves), longest = 8 moves
90%-d27 ProteusSF_280722.exp (eman 8.40) : 74% (114 moves), longest = 8 moves

link : games
only for family, friends and customers (request password and information by PM)

OpenChess

OpenChess

Experience Book Eval Importance

Experience Book Eval Importance

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Re: Experience Book Eval Importance

Re: Experience Book Eval Importance

Re: Experience Book Eval Importance

Re: Experience Book Eval Importance