OpenChess

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engine_weight[18]=40

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# difference weight table scale
{
black_difference_table[1]=45 # 0-8
black_difference_table[2]=35 # 9-16
black_difference_table[3]=25 # 17-24
black_difference_table[4]=15 # 25-32
black_difference_table[5]=4 # > 32

white_difference_table[1]=10 # > 32
white_difference_table[2]=8 # 25-32
white_difference_table[3]=6 # 17-24
white_difference_table[4]=4 # 9-16
white_difference_table[5]=2 # 0-8
}

# difference weight table scale
{
black_difference_table[1]=45 # 0-8
black_difference_table[2]=35 # 9-16
black_difference_table[3]=25 # 17-24
black_difference_table[4]=15 # 25-32
black_difference_table[5]=4 # > 32

white_difference_table[1]=10 # > 32
white_difference_table[2]=8 # 25-32
white_difference_table[3]=6 # 17-24
white_difference_table[4]=4 # 9-16
white_difference_table[5]=2 # 0-8
}

# Weight look-up table scale
Weight_Lookup_Scale()
{
  if [ $lookup_table_bit -eq 0 ]; then    
    if (( $engine_weight_difference <= 8 )); then
     black_table_weight=${black_difference_table[1]} 
    elif (( $engine_weight_difference >= 9 && $engine_weight_difference <= 16 )); then
     black_table_weight=${black_difference_table[2]}
    elif (( $engine_weight_difference >= 17 && $engine_weight_difference <= 24 )); then
     black_table_weight=${black_difference_table[3]}
    elif (( $engine_weight_difference >= 25 && $engine_weight_difference <= 32 )); then
     black_table_weight=${black_difference_table[4]}
    elif (( $engine_weight_difference > 32 )); then
     black_table_weight=${black_difference_table[5]}
    fi
    white_table_weight=0
  else
    if (( $engine_weight_difference <= 8 )); then
     white_table_weight=${white_difference_table[5]} 
    elif (( $engine_weight_difference >= 9 && $engine_weight_difference <= 16 )); then
     white_table_weight=${white_difference_table[4]}
    elif (( $engine_weight_difference >= 17 && $engine_weight_difference <= 24 )); then
     white_table_weight=${white_difference_table[3]}
    elif (( $engine_weight_difference >= 25 && $engine_weight_difference <= 32 )); then
     white_table_weight=${white_difference_table[2]}    
    elif (( $engine_weight_difference > 32 )); then
     white_table_weight=${white_difference_table[1]}  
    fi
    black_table_weight=0
  fi
}

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# Draw formula -- decrease to increase win
Draw_Weight_Scale()
{ 
  if [ $scale_side_switch -eq 0 ]; then
    black_scale_weight=`expr $weaker_engine_weight*.425 | bc` 
  else
    white_scale_weight=`expr $weaker_engine_weight*.185 | bc`
  fi
}

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Chess Engine Rating List Simulator

Enter 1 for Gauntlet or 2 for Round-Robin: 1
List Engines? Enter y or n: n
Enter engine number: 1
Enter number of rounds: 100
Generating game database.......................Complete!

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Chess Engine Rating List Simulator

Enter 1 for Gauntlet or 2 for Round-Robin: 2
List Engines? Enter y or n: n
Enter number of rounds: 300
Generating game database......................Complete!

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This program (bash script) is used for simulating and predicting outcome for chess engine matches and tournaments.
It generates a game (CRLS.pgn) database at the conclusion of each run. 
The results should be compared to rating lists such CEGT, CCRL, SWCR, SSDF, etc.

How to run:
sh CRLS or ./CRLS
# Windows users need to research openSUSE (Linux) LiveCD, or cygwin and notepad++
# There is also http://win-bash.sourceforge.net/

Prompt/Usage:
"Enter 1 for Gauntlet or 2 for Round-Robin: " 
# Gauntlet allows an engine to compete against a group of engines
# Round-Robin allows all engines in a tournament to play each other
"List Engines? Enter y or n: " 
# List all available chess programs 

"Enter engine number (1-25), l (list engines), f (finish), or q (quit): " 
# Choose up to 16 programs. Enter each, one at a time
# Enter l to see available programs
# Enter f after selecting the program(s) 
# Enter p to see already selected programs
# Enter q to quit the program

"Enter number of round(s) (1-999999): " 
# Enter the number of round(s)/game(s) to play

Gauntlet:
"Enter engine number (1-25): " 
# Enter engine number from available engines' list
"Play against all engines? Enter y or n: " 
# If yes, selected engine plays all available programs
"Enter engine number (1-25), l (list engines), f (finish), or q (quit): " 
# Choose program(s) to play against selected engine. 

Round-Robin
"List Engines? Enter y or n: " 
# List all available chess programs
"Play against all engines? Enter y or n: " 
# If yes, all available programs play round-robin style tournament
"Enter engine number (1-25), l (list engines), f (finish), or q (quit): " 
# Select the programs to compete in the tournament

Source Editing

Change Engine Weight
# For example, Critter 1.2:
engine_weight[21]=445 # 40

Add/Remove engine requires 3 changes:
# For example: adding a new program
MAXENGINECOUNT=26
chess_engine[26]="Engine Name"
engine_weight[26]=100

To increase/decrease wins, edit values in Draw_Weight_Scale()

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Games        : 150000 (finished)

White Wins   :  58442 (39.0 %)
Black Wins   :  44737 (29.8 %)
Draws        :  46821 (31.2 %)
Unfinished   :      0

White Perf.  : 54.6 %
Black Perf.  : 45.4 %