Winboard Forum

Hi,

My chess teacher is interesting in find a few engines which let him personalize the evaluation vars (personalities). What strong engines can do that in a reliable way?

thx.

Hi Fermin,

Jim Abblet did a version of Toga II with personalities, it is based on version 0.93 and know that is each parameter is easy if you know a little bit of Fruit and English.

http://homepages.tesco.net/henry.ablett/jims.html

Fruit 2.3.1 also has enough parameters to configure, but I did not understand many of them.

Also Prodeo and Crafty, there are versions of these engines with different personalities, for example, mimic the style of great players, although in this case can not be changed as many parameters as the first case that I commented.

Fruit Toga II Personality file

Only lines with hash in front are read.

Remove a HASH and you'll get a CRASH!
Dont remove them.

Missing values will also cause a CRASH!

Parameter comments and logical grouping
by Fabien Letouzey (Fruit).


--------------------------------

**************
Main search
**************

--------------------------------
NULL MOVE
--------------------------------
#UseNull_Move 1

#UseNull_Eval 1
0 -> Always null move eval
1 -> Only at fail-high nodes
(eval >=beta)

#Null_Reduction 3
--------------------------------


--------------------------------
VERIFICATION SEARCH
--------------------------------
#UseVerification_Search 1

#UseVerification_Endgame 1
if UseVerification_Endgame is
set to 0, verification search
is always performed

#Verification_Reduction 5
--------------------------------


--------------------------------
THESE ARE CLASSICAL

Futility only at depth = 1
Delta pruning is for Quiescent
Search
--------------------------------
#Use_IID 1
#ExtendSingle_Reply 1

#UseFutility_Pruning 0
#Futility_Margin 50

#UseHistory_Pruning 1
#History_Depth 3
#History_Threshold 60
#HistoryMove_Number 3

#Use_Delta 0
#Delta_Margin 50
--------------------------------



--------------------------------

************
Evaluation
************

--------------------------------
HIGH-LEVEL WEIGHTS (100 = 100%)
--------------------------------

They are the easiest way to
affect playing style. They roughly
correspond to eval modules. Piece
activity comprises piece placement
and mobility.

--------------------------------
#KingSafety_Weight 100
#PassedPawn_Weight 100
#Pawn_StructureWeight 100
#Material_Weight 100
#PieceActivity_Weight 100
--------------------------------


--------------------------------
MATERIAL WEIGHTS
--------------------------------
#Pawn_Opening 100
#PawnEnd_game 100
#Knight_Opening 325
#Knight_Endgame 325
#Bishop_Opening 325
#Bishop_Endgame 325
#Rook_Opening 500
#Rook_Endgame 500
#Queen_Opening 1000
#Queen_Endgame 1000
#BishopPair_Opening 50
#BishopPair_Endgame 50
--------------------------------


--------------------------------
TOGA SPECIFIC

Better known as "Bad-Trade"
penalty.
--------------------------------
#OpeningExchange_Penalty 40
#EndgameExchange_Penalty 40
--------------------------------


--------------------------------
PAWN EVAL

Min-Max indicate rank 2-7
--------------------------------
#Doubled_Opening 10
#Doubled_Endgame 20
#Isolated_Opening 10
#Isolated_OpeningOpen 20
#Isolated_Endgame 40
#Backward_Opening 8
#Backward_OpeningOpen 16
#Backward_Endgame 10
#Candidate_OpeningMin 5
#Candidate_OpeningMax 55
#Candidate_EndgameMin 10
#Candidate_EndgameMax 110
#PassedOpening_Min 10
#PassedOpening_Max 70
#PassedEndgame_Min 20
#PassedEndgame_Max 140
--------------------------------


--------------------------------
MOBILITY MULTIPLIER FOR EACH
ATTACKED SQUARE

"move" = empty square
"attack" = opponent square
"defense"= friendly piece
--------------------------------
#Mob_Move 1
#Mob_Attack 1
#Mob_Defense 0
--------------------------------


--------------------------------
MOBILITY
--------------------------------
#KnightMob_Opening 4
#KnightMob_Endgame 4
#BishopMob_Opening 5
#BishopMob_Endgame 5
#RookMob_Opening 2
#RookMob_Endgame 4
#QueenMob_Opening 1
#QueenMob_Endgame 2
--------------------------------


--------------------------------
KING PAWN SHELTER (100 = 100%)
--------------------------------
#Use_Shelter 1
#Shelter_Opening 75
--------------------------------


--------------------------------
7TH RANK BONUSES
--------------------------------
#Rook7th_Opening 20
#Rook7th_Endgame 40
#Queen7th_Opening 10
#Queen7th_Endgame 20
--------------------------------


--------------------------------
THESE THREE ARE PATTERNS.

Maybe too rare to notice effect
--------------------------------
#Trapped_Bishop 100
#Blocked_Bishop 50
#Blocked_Rook 50
--------------------------------


--------------------------------
THESE ARE PASSED-PAWN SCORING.

"Free Passer" means it can
advance 1 rank. Distance are
related to king positions
--------------------------------
#Unstoppable_Passer 800
#Free_Passer 60
#Attacker_Distance 5
#Defender_Distance 20
--------------------------------



--------------------------------

***************
PST Options
***************

--------------------------------
#PawnFile_Opening 5
{central files}

#KnightCentre_Opening 5
#KnightCentre_Endgame 5
{centrality}

#KnightRank_Opening 5
{advancement}

#KnightBackRank_Opening 0
{development - centrality
should be enough}

#Knight_Trapped 100
{knight in the corner,
little effect}

#BishopCentre_Opening 2
#BishopCentre_Endgame 3
{centrality}

#BishopBackRank_Opening 10
{development}

#BishopDiagonal_Opening 4
{bishop on a1-h8 or h1-a8
probably useless}

#RookFile_Opening 3
{central files}

#QueenCentre_Opening 0
#QueenCentre_Endgame 4
{centrality}

#QueenBackRank_Opening 5
{development}

#KingCentre_Endgame 12
{centrality}

#KingFile_Opening 5
{king on wings}

#KingRank_Opening 10
{anti-advancement}
--------------------------------



***** End of Toga II config file ****

Jim also created a Romichess with personality file. I believe Jim still has a compile of a Mike Byrne created Crafty 2004 SE on his website.