UCI Option chaos

[chrisw]

Just for fun, and maybe to propose rationalising UCI Options, here's a trawl of engines:

(I guess I could list them by frequency also, or if testers found it useful, by some other ways ...?)

found 683 unique options
from 199 unique engines

pvk lo depth
UseNNUE
MinimumRemainingPickingWork
Hash File
Use Gaviota Tables
UCI Log File
Bad Trade Value
Single Reply Extension (non-PV nodes)
Search Driver
Razoring Margin
NM_PV
MateFinder
FpuStrategy
Skill Level
MaxPrefetch
EvalFile
Book File
Lazy Eval
EGTB
MovesLeftQuadraticFactor
Bishop Pair (Endgame)
Opening Knight Value
LargePages
ev_ktabm
Write Debug Log
NM_Net_Trigger
NalimovPath
Syzygy 50 Move Rule
MaxCollisionVisits
TwoFoldDraws
Verbose
Pawn Duo Rank 3
Quiescence Checks PV
Progress Threshold
Maximum Razoring Depth
BF_Net_Trigger
Bitbases Cache Size
GaviotaTbCompression
NM_V_Depth
Fallback to Internal Book
PolicyTemperature
StickyEndgames
Mobility (Endgame)
GenFenDepthEG
BookFile
Pawn Duo File a+b or g+h
Drawscore
Space
IRR
ev_pdoubled
MinibatchSize
hmb open
WeakSquareWeight
BookMoveSelect
Hash Pruning Depth
TempDecayMoves
PPExt
NalimovCache
Search Log Filename
ev_isoo
King Safety X Intercept
Hide Redundant Output
BF_Stat
UCI_AnalyseMode
Bishop Pair
UserQ2
EGTB Probe Depth
Bishop
Pieces over queen bonus
Pawn Push to 7th Extension (PV nodes)
ev_ntabm
Use Search Log
ThreadIdlingThreshold
Extended Futility Pruning
ev_pmob
Queen
Queen Contact Check Bonus
Write Search Log
Mate Threat Extension (non-PV nodes)
MaxCollisionVisitsScalingStart
AnalysisMode
PawnValueEn
Minimum Split Depth
LSN filtering
EGBB Path
Checks in Quiescence
Pawn Duo File c+d or e+f
Bishop Pair Endgame
NullMove Pruning
GenFen
Cowardice
UserP6
Piece Square Activity
NoobBookLimit
Alt Pawn SQT
ktabm End
Time Allocation
MoveOverheadMs
ev_pthreat
allk hi depth
PawnHash
Emergency Move Horizon
Use Sleeping Threads
Toga King Safety
MaxCollisionVisitsScalingPower
AnalysisAgeHash
UCI_Opponent
SyzygyTbPath
Red depth threshold
BookDepth
Hash Pruning
Use tablebases
Resolve Score Drops
History Threshold
Use Fast Eval
rook tropism opening
Tactical Mode
StylePositional
Special Node Level
ev_qtabm
BookFilename
IdlingMinimumWork
AF_Depth_Weight
Emergency Move Time
StyleMaterial
SF Write Depth
MCTS Explore
bishop tropism endgame
ev_rtabm
Extended Futility Margin
Fruit King Safety
UserP3
Hash File Name
Toga Lazy Eval Margin
King Center Endgame
Hard_Probe_Depth
King Tropism
MaxOutOfOrderEvalsFactor
NNUEScaling
Analysis Contempt
MobilityWeight
null move pruning
Passed Pawns (Midgame)
winning_optimism_mobility_them
Allow Large Pages
GaviotaTbPath
King Sideline Penalty
Pruning
Endgame Knight Value
Strength
BookPath
FiftyMoveScore
SyzygyProbeDepth5
Toga King Safety Margin
Mobility (Midgame)
AF_Base
ev_ropen
ev_ppdefend
Pawn Structure (Endgame)
Check Extension (PV nodes)
Sudden Divisor
OwnBook_Variety
StyleAttack
time usage aggressiveness
Rook Contact Check Bonus
Fruit Lazy Eval
PPP Level
Futility Margin (Depth=3)
NoobBook
Round Eval
MoveOverheadType
ev_minorbehind
NNUE file
BishopValueEn
PawnStormWeight
Bishop Check Bonus
DrawScoreOpponent
Pawn (Endgame)
Output Search Depth Info
Null Move pruning
Output Total Time and Nodes
Rebel Reductions
Temperature
Deterministic
Max Threads per Split Point
Pawn Duo
Reduction
BF_D3
Clear_Hash
Fruit Lazy Eval Margin
Number of Threads
nodesBasedLevel
DrawScoreBlack
rook tropism endgame
Slow Mover
SmartPruningFactor
OwnBook
BF_D2
Best Line
WDL_display
Time Usage Aggressiveness
Use Debug Log
Never Clear Hash
Favor high-weighted book moves
DirichletNoise
ClearHash
Use Queen in Hole Bonus
RepetitionScore
HistoryFill
ImmediateTimeUse
Randomize book moves
SF Size
Alt Bishop SQT
TempCutoffMove
SF Strategy
Pawn Duo File b+c or f+g
History Move Number
Quiescence Checks
Move_Overhead
NullMove
UCI_ShowCurrLine
Enhanced Transposition Cutoff
Selective Plies
History Pruning
Bitbase pieces
TempVisitOffset
Piece Pawn Score Adjustment
Endgame Queen Value
Pawn Duo PP Level
ev_qval
TimeBuffer
ktabm Open
ev_bpair
Queen (Endgame)
Razoring Decay
Passed Pawns (Endgame)
KingShelterWeight
Output Current Move Info
Pawn Endgame Extension (PV nodes)
CommandFile
MinMoveOverHead
EGTB Fifty Move Rule
winning_optimism_mobility_us
losing_optimism_mobility_us
Check Extension (non-PV nodes)
Min Split Depth
knight tropism endgame
Verification Reduction
hmb end
UCI_Chess960
Threads
RookInOpenFileOp
UCI_LimitStrength
Bitbases Path
King Safety Max Slope
Futility Pruning (Main Search)
winning_optimism_pawns_us
QB WORSE THAN QN PENALTY
Pawn Opening
Alt Knight SQT
Fruit King Safety Margin
Console Mode
Minimal Reporting
Syzygy Probe Depth
BF_Imp
Use Bishop in Hole Bonus
King Safety Curve
Toga Lazy Eval
Analysis_Contempt
Backend
SaveHashtoFile
BackendOptions
UserQ5
ev_qmob
Rook Value
MovesLeftSlope
TaskWorkers
Use Search Focus
bongCloud
Variety
StaleMateScore
Evaluation Pruning Depth
Eval-Depth
Load Hash from File
Best Book Line
TimeManager
winning_optimism_pieces_us
UserQ4
Selectivity
Pawn Duo File c+d or e+f (Endgame)
LSN Value Margin
TBUsage
ev_rhalf
Log
SyzygyProbeDepth6
UCI_ShowWDL
MoveOverhead
RookValueOp
FpuStrategyAtRoot
Opening Pawn Value
Fischer Divisor
Futility Margin 2
QueenValueEn
GenFenDepth
DrawScoreWhite
AlwaysFullPv
Move on Ponderhit
StyleForwardness
Play Style
Rook over Knight endgame bonus
AF_Imp
Pawn Shielding Soft
Threat Depth
Hash
ContemptMid
Fruit Exchange Bonus
Razoring
MinimumPickingWork
White Contempt
queen tropism opening
Tablebase Usage
PawnValueOp
Bishop Value
Toga Rook Pawn Endgame Penalty
Session File
Pawn Duo Rank 7
Aspiration Window
UCI_RatingAdv
Passed Pawns
Syzygy Probe Limit
EGBB Cache
NM_Depth
History Research on Beta
Pawn Duo File d+e
Futility Margin 0
Pawn Duo Rank 4
Gaviota Min Pieces
Toga History Threshold
EvalHash
Level
NNUEFile
Emergency Base Time
EngineMode
Opening Bishop Value
MaxCollisionEvents
FixedDepth
Debug Log File
winning_optimism_pieces_them
bishop tropism opening
Rook Behind PP Level
StyleMobility
Aspiration Search
UseBook
MovesLeftThreshold
Contempt Factor
ev_bwp_1
Magnify
Queen Tropism
Pawn Protected PP Level
BISHOP PAIR VS NO MINORS
ev_nval
B BETTER THAN N BONUS
move overhead milliseconds
OutOfOrderEval
RB BETTER THAN RN BONUS
PassedPawnWeightEn
NNUE Tuner
Evaluation Pruning
Discovered Check Bonus
SingleReply Extension
Knight Tropism
OwnBook_Depth
SF Move Limit
Pawn Structure (Middle Game)
ev_passed
King Safety Coefficient
NodeAffinity
Rook Bishop combo
Pawn Shelter
NUMA Enabled
ev_rpair
Debug Log
ev_pval
Queen Value
SyzygyProbeLimit
nodestime
King Safety
fut
Evalcorrect
ev_islands
ev_btabm
ev_ptabm
PersonalityFile
LogLevel
Use_NNUE
ScoreType
PawnPush Extension
Maximum Number of Threads per Split Point
Pawn Endgame Extension (non-PV nodes)
Search Direction
Passed Pawn Extension (PV nodes)
LogFile
DrawScore
NM_Imp
CPuctBase
ScaleKingSafety
Futility Pruning
NullMove Reduction
Log File
QueenValueOp
IIR Depth
UserP5
Pawn
Smart Syzygy
ev_ppinc
Minimum Thinking Time
queen tropism endgame
knight tropism opening
deterministic
ev_luftp
Futility Margin (Depth=1)
NNCacheSize
StyleComplexity
Split_Depth
SyzygyUse50MoveRule
QRB BETTER THAN QRN BONUS
Use Knight in Hole Bonus
Knight Value
UserP4
Futility Pruning (Quiescence Search)
Aspiration window
Knight
SF Material Limit
UCI_ShowMovesLeft
table memory
BF_R2
Material
Weights
AutoClearHash
Pawn Structure
Use Bad Bishop
ev_predundant
ev_qpair
Ponder
ContemptComplexity
Single Evasion Extension (non-PV nodes)
TTFile
Search Time
Verification Search
Endgame Pawn Value
NUMA Offset
ev_ksarea
MinProbeDepth
LSN Time Margin (sec)
PassedPawnWeightOp
MaxCollisionVisitsScalingEnd
Move overhead
Use piece combos
LoadHashfromFile
Pawn Endgame
Toga King Pawn Endgame Bonus
NeverClearHash
winning_optimism_pawns_them
MinimumKLDGainPerNode
MaxConcurrentSearchers
Endgame Bishop Value
Bishop (Endgame)
Time Usage
MovesLeftConstantFactor
Queen Check Bonus
Rook
OwnBook_File
Delta Margin
Rook Behind Opp PP Level
Rook Attack
NM_Threat
Delta Pruning
Favor frequent book moves
allk lo depth
NM_Stat
TempEndgame
TimeBufferMilliSec
ev_kppdist
Own Book
Overhead ms
LogFileName
BF_R1
King Defend PP Level
NNUENetpath
Aggressiveness
personalityFile
Use Lmr
BestBookMove
Pawn Duo Rank 6
Favor best book moves
Hash Pruning Margin
UseNullMove
Opening Rook Value
Eval-Margin
Pawn Duo Rank 2
Use PPP
Mobility (Middle Game)
Pawn Duo File d+e (Endgame)
Large_Pages
KLDGainAverageInterval
GaviotaTbCache
Opening Queen Value
MultiPV
Time Buffer
FpuValue
Razoring Depth
Endgame Rook Value
MinimumPerTaskProcessing
ev_rval
Quiescence Check Plies
Rook Check Bonus
Play level
Focus Depth
ev_ksattm
Full Depth Moves (PV nodes)
SyzygyProbeDepth
Save Hash to File
BF_Depth
KnightValueOp
knight tropism
Futility Margin 1
forceNNUE
Use Aspiration search
Communication Overhead
Armageddon
FiftyMoveDistance
ev_nmob
RookInOpenFileEn
PC_Net_Trigger
ev_blockedopen
ev_rwp_1
Single Reply Extension (PV nodes)
VerboseBook
Large Pages
losing_optimism_pawns_us
Table Memory
cppn
Idle Threads Sleep
UserQ1
pvk hi depth
Null Move Pruning
Pawn Hash
InsufficientMaterialScore
bishop tropism
UserQ6
MultiPV_cp
TTSave
DrawScoreSideToMove
Queen Knight combo
Skill
Move Overhead Milliseconds
Pawn Duo File b+c or f+g (Endgame)
CacheHistoryLength
MovesLeftScaledFactor
Single Evasion Extension (PV nodes)
Use LMR
PerPVCounters
Full Depth Moves (non-PV nodes)
VerboseMoveStats
Pawn Duo Rank 5
BF_D1
TTLoad
AF_Threat
Toga Lazy Eval Mobility Margin
Book Moves
Mate Threat Extension (PV nodes)
NNUEThreshold
RandomPly
Chess Knowledge
Contempt
RamLimitMb
rook tropism
ev_hmb
Mate Threat Bonus
BishopValueOp
losing_optimism_pawns_them
ContemptMG
ev_pduofended
ev_rmob
MovesLeftMaxEffect
Quick Futility eval
StyleDevelopment
HashFile
Large memory pages
use lmr
KingAttackWeight
UserP2
losing_optimism_pieces_them
Complete PV
BookBestMove
Passed Pawn Extension (non-PV nodes)
CPuctFactor
Syzygy50MoveRule
SyzygyPath
King Attack
King Safety Max Value
Pawn Structure (Midgame)
Knight Check Bonus
Use Session File
SolidTreeThreshold
ev_bval
ConfigFile
losing_optimism_pieces_us
Tablebase
Piece Activity
CPuct
queen tropism
UserP1
RandomOpen
Max_Threads
Book selectivity
ev_pbkwd
ev_outpost
Pawn Duo File a+b or g+h (Endgame)
Search Focus Ext
Clear Hash
Futility Margin (Depth=2)
BookRandom
BF_Capture
Suppress
Bishop Pair Opening
AF_Lesser_Threat
Best Book Move
PV Hash
Toga Extended History Pruning
RookValueEn
Split Depth
KnightValueEn
MCTS Hash
UCI_Elo
Use King Tropism
FpuValueAtRoot
Dynamism
ContemptEnd
ScaleMaterial
ev_nwp_1
Pawn Push to 7th Extension (non-PV nodes)
ev_bmob
Start Max PP Level
ev_isoh
Search Depth
Futility Margin
Priority
Clear SF
SyzygyFastPlay
Soft_Probe_Depth
Pawn Duo Weight (Endgame)
MultiGather
BufferTime
Use NNUE
Toga Exchange Bonus
Move Overhead
UCI_EngineAbout
Rook (Endgame)
King Attack PP Level
Use Syzygy
Slowmover
Use MCTS
MinimumProcessingWork
TempValueCutoff
losing_optimism_mobility_them
Pawn Duo Weight
WeightsFile
Pawn_Hash
Max Active Splits/Thread
NM_Base
Knight (Endgame)
SmartPruningMinimumBatches
Pawn Storm
Tablebases
ContemptDrawPenalty
Pawn Shielding Hard
Passed Pawns (Middle Game)
Randomness
UserQ3
King Safety Aggressiveness
NodesPerSecondLimit
ev_ksdefm

[chrisw]

Sorted by frequency:

Hash 192
Ponder 163
Threads 143
MultiPV 129
OwnBook 93
SyzygyPath 77
Clear Hash 72
UCI_Chess960 64
SyzygyProbeDepth 51
Contempt 47
Syzygy50MoveRule 34
BookFile 34
SyzygyProbeLimit 33
UCI_AnalyseMode 32
UCI_LimitStrength 31
UCI_Elo 31
Book File 29
Skill Level 28
NullMove Reduction 26
King Safety 26
Move Overhead 25
Slow Mover 25
NullMove Pruning 24
History Pruning 24
History Threshold 24
Piece Activity 24
Pawn Structure 24
Passed Pawns 24
Quiescence Check Plies 23
Material 22
MoveOverhead 21
nodestime 21
Debug Log File 20
Verification Search 20
Verification Reduction 19
Delta Pruning 18
Delta Margin 18
Minimum Thinking Time 17
Use NNUE 17
EvalFile 16
Analysis Contempt 14
UCI_ShowWDL 14
Futility Pruning 13
Log 12
Search Time 12
Search Depth 12
Use tablebases 11
Toga Lazy Eval 11
Toga Lazy Eval Margin 11
NullMove 10
GaviotaTbPath 10
GaviotaTbCache 10
SyzygyTbPath 10
SyzygyUse50MoveRule 10
Futility Margin 10
Best Book Line 10
PawnHash 9
Search Log Filename 9
Mobility (Endgame) 9
Passed Pawns (Endgame) 9
Aggressiveness 9
Cowardice 9
Drawscore 9
NalimovPath 8
NalimovCache 8
Favor frequent book moves 8
Favor best book moves 8
Minimum Split Depth 8
Extended Futility Margin 8
Space 8
BookPath 8
Best Book Move 8
Move overhead 7
Contempt Factor 7
Use Search Log 7
Mobility (Middle Game) 7
Passed Pawns (Middle Game) 7
Razoring Margin 7
Strength 7
Log File 7
Use Lmr 7
NNUE Tuner 7
Piece Square Activity 7
Emergency Move Horizon 7
Emergency Base Time 7
Emergency Move Time 7
Favor high-weighted book moves 6
LogFile 6
Maximum Number of Threads per Split Point 6
Minimal Reporting 6
move overhead milliseconds 6
Toga Lazy Eval Mobility Margin 6
Toga King Pawn Endgame Bonus 6
Toga Rook Pawn Endgame Penalty 6
EvalHash 5
King Tropism 5
Pawn Structure (Endgame) 5
Min Split Depth 5
Table Memory 5
Null Move Pruning 5
Use Syzygy 5
Syzygy Probe Depth 5
Syzygy Probe Limit 5
Syzygy 50 Move Rule 5
Razoring 5
Razoring Depth 5
Evaluation Pruning 5
Evaluation Pruning Depth 5
Use Sleeping Threads 5
Toga King Safety 5
Toga Extended History Pruning 5
Randomize book moves 5
NNUE file 5
LargePages 4
NoobBookLimit 4
NoobBook 4
GaviotaTbCompression 4
ClearHash 4
ContemptDrawPenalty 4
ContemptComplexity 4
Save Hash to File 4
Load Hash from File 4
Null Move pruning 4
UCI_Opponent 4
DrawScore 4
BookRandom 4
Number of Threads 4
Weights 4
Write Debug Log 4
Toga King Safety Margin 4
Communication Overhead 4
Book selectivity 3
BookDepth 3
AnalysisMode 3
SingleReply Extension 3
UCI_EngineAbout 3
Futility Margin (Depth=1) 3
Futility Margin (Depth=2) 3
Pawn Structure (Middle Game) 3
Check Extension (PV nodes) 3
Check Extension (non-PV nodes) 3
Mate Threat Extension (PV nodes) 3
Mate Threat Extension (non-PV nodes) 3
Pawn Push to 7th Extension (PV nodes) 3
Pawn Push to 7th Extension (non-PV nodes) 3
Passed Pawn Extension (PV nodes) 3
Passed Pawn Extension (non-PV nodes) 3
Pawn Endgame Extension (PV nodes) 3
Pawn Endgame Extension (non-PV nodes) 3
Hash File Name 3
Overhead ms 3
Time Usage 3
Selectivity 3
Reduction 3
Deterministic 3
IIR Depth 3
Lazy Eval 3
SyzygyProbeDepth5 3
SyzygyProbeDepth6 3
EngineMode 3
Fallback to Internal Book 3
Output Search Depth Info 3
Output Current Move Info 3
Output Total Time and Nodes 3
Console Mode 3
CommandFile 3
AlwaysFullPv 2
Tablebases 2
BestBookMove 2
Large Pages 2
Skill 2
PersonalityFile 2
Tablebase Usage 2
Use Session File 2
Session File 2
SF Size 2
SF Write Depth 2
Clear SF 2
Resolve Score Drops 2
Verbose 2
TimeBuffer 2
Use Gaviota Tables 2
Gaviota Min Pieces 2
Search Driver 2
PawnPush Extension 2
Checks in Quiescence 2
Pawn 2
Knight 2
Bishop 2
Rook 2
Queen 2
Bishop Pair 2
Time Allocation 2
Futility Margin (Depth=3) 2
Fruit Lazy Eval 2
Fruit Lazy Eval Margin 2
Fruit Exchange Bonus 2
Fruit King Safety 2
Fruit King Safety Margin 2
Bitbase pieces 2
History Research on Beta 2
Rebel Reductions 2
Quick Futility eval 2
Alt Pawn SQT 2
Alt Knight SQT 2
Alt Bishop SQT 2
Chess Knowledge 2
Pawn Shelter 2
Opening Pawn Value 2
Opening Knight Value 2
Opening Bishop Value 2
Opening Rook Value 2
Opening Queen Value 2
Endgame Pawn Value 2
Endgame Knight Value 2
Endgame Bishop Value 2
Endgame Rook Value 2
Endgame Queen Value 2
Bishop Pair Opening 2
Bishop Pair Endgame 2
Queen Knight combo 2
Rook Bishop combo 2
Bad Trade Value 2
King Safety Curve 2
King Safety Coefficient 2
King Safety X Intercept 2
King Safety Max Slope 2
King Safety Max Value 2
Queen Contact Check Bonus 2
Queen Check Bonus 2
Rook Check Bonus 2
Bishop Check Bonus 2
Knight Check Bonus 2
Discovered Check Bonus 2
Mate Threat Bonus 2
Single Reply Extension (PV nodes) 2
Single Reply Extension (non-PV nodes) 2
Full Depth Moves (PV nodes) 2
Full Depth Moves (non-PV nodes) 2
Threat Depth 2
Selective Plies 2
Futility Pruning (Main Search) 2
Futility Pruning (Quiescence Search) 2
Futility Margin 0 2
Futility Margin 1 2
Futility Margin 2 2
Maximum Razoring Depth 2
Randomness 2
UCI_ShowCurrLine 2
PV Hash 2
Aspiration window 2
Large memory pages 2
Use LMR 2
Dynamism 2
White Contempt 2
Special Node Level 2
time usage aggressiveness 2
use lmr 2
null move pruning 2
deterministic 2
Best Line 2
King Safety Aggressiveness 2
ktabm Open 2
ktabm End 2
Move Overhead Milliseconds 2
Time Usage Aggressiveness 2
BufferTime 2
Armageddon 2
Max Threads per Split Point 2
Write Search Log 2
Mobility (Midgame) 2
Pawn Structure (Midgame) 2
Passed Pawns (Midgame) 2
Toga History Threshold 2
Bitbases Path 2
Bitbases Cache Size 2
WeightsFile 2
Backend 2
BackendOptions 2
NNCacheSize 2
MinibatchSize 2
MaxPrefetch 2
CPuct 2
CPuctBase 2
CPuctFactor 2
VerboseMoveStats 2
SmartPruningFactor 2
FpuStrategy 2
FpuValue 2
CacheHistoryLength 2
PolicyTemperature 2
MaxCollisionEvents 2
MaxCollisionVisits 2
OutOfOrderEval 2
StickyEndgames 2
SyzygyFastPlay 2
ScoreType 2
HistoryFill 2
MoveOverheadMs 2
RamLimitMb 2
ConfigFile 2
IRR 2
Eval-Depth 2
Eval-Margin 2
Razoring Decay 2
NeverClearHash 1
HashFile 1
SaveHashtoFile 1
LoadHashfromFile 1
Tablebase 1
NodeAffinity 1
Priority 1
TTFile 1
TTSave 1
TTLoad 1
Max_Threads 1
Pawn_Hash 1
Large_Pages 1
TBUsage 1
SF Strategy 1
Split Depth 1
SF Material Limit 1
SF Move Limit 1
BookFilename 1
BookMoveSelect 1
PawnValueOp 1
PawnValueEn 1
KnightValueOp 1
KnightValueEn 1
BishopValueOp 1
BishopValueEn 1
RookValueOp 1
RookValueEn 1
QueenValueOp 1
QueenValueEn 1
KingShelterWeight 1
PawnStormWeight 1
KingAttackWeight 1
MobilityWeight 1
PassedPawnWeightOp 1
PassedPawnWeightEn 1
WeakSquareWeight 1
RookInOpenFileOp 1
RookInOpenFileEn 1
RepetitionScore 1
InsufficientMaterialScore 1
FiftyMoveScore 1
StaleMateScore 1
TimeBufferMilliSec 1
AutoClearHash 1
ev_pval 1
ev_nval 1
ev_bval 1
ev_rval 1
ev_qval 1
ev_pmob 1
ev_nmob 1
ev_bmob 1
ev_rmob 1
ev_ropen 1
ev_rhalf 1
ev_qmob 1
ev_bpair 1
ev_rpair 1
ev_qpair 1
ev_pdoubled 1
ev_predundant 1
ev_islands 1
ev_isoh 1
ev_isoo 1
ev_pduofended 1
ev_pbkwd 1
ev_blockedopen 1
ev_passed 1
ev_ppdefend 1
ev_ppinc 1
ev_kppdist 1
ev_ptabm 1
ev_ntabm 1
ev_btabm 1
ev_rtabm 1
ev_qtabm 1
ev_ktabm 1
ev_nwp_1 1
ev_bwp_1 1
ev_rwp_1 1
ev_luftp 1
ev_ksarea 1
ev_ksdefm 1
ev_ksattm 1
ev_pthreat 1
ev_outpost 1
ev_minorbehind 1
ev_hmb 1
Aspiration Search 1
Aspiration Window 1
Complete PV 1
Enhanced Transposition Cutoff 1
Pawn (Endgame) 1
Knight (Endgame) 1
Bishop (Endgame) 1
Rook (Endgame) 1
Queen (Endgame) 1
Bishop Pair (Endgame) 1
History Move Number 1
Extended Futility Pruning 1
EGBB Path 1
EGBB Cache 1
EGTB 1
Quiescence Checks 1
Quiescence Checks PV 1
Pruning 1
Use Aspiration search 1
Use Fast Eval 1
PPExt 1
Use Search Focus 1
Focus Depth 1
Search Focus Ext 1
Round Eval 1
Play Style 1
Pawn Shielding Hard 1
Pawn Shielding Soft 1
Knight Tropism 1
Queen Tropism 1
King Center Endgame 1
King Sideline Penalty 1
Pawn Opening 1
Pawn Endgame 1
Knight Value 1
Bishop Value 1
Rook Value 1
Queen Value 1
Use PPP 1
PPP Level 1
Start Max PP Level 1
Pawn Protected PP Level 1
Pawn Duo PP Level 1
Rook Behind PP Level 1
Rook Behind Opp PP Level 1
King Attack PP Level 1
King Defend PP Level 1
Pawn Duo 1
Pawn Duo Weight 1
Pawn Duo Weight (Endgame) 1
Pawn Duo File a+b or g+h 1
Pawn Duo File b+c or f+g 1
Pawn Duo File c+d or e+f 1
Pawn Duo File d+e 1
Pawn Duo File a+b or g+h (Endgame) 1
Pawn Duo File b+c or f+g (Endgame) 1
Pawn Duo File c+d or e+f (Endgame) 1
Pawn Duo File d+e (Endgame) 1
Pawn Duo Rank 2 1
Pawn Duo Rank 3 1
Pawn Duo Rank 4 1
Pawn Duo Rank 5 1
Pawn Duo Rank 6 1
Pawn Duo Rank 7 1
Use Knight in Hole Bonus 1
Use Bishop in Hole Bonus 1
Use Bad Bishop 1
Use Queen in Hole Bonus 1
BISHOP PAIR VS NO MINORS 1
Use piece combos 1
QB WORSE THAN QN PENALTY 1
RB BETTER THAN RN BONUS 1
QRB BETTER THAN QRN BONUS 1
B BETTER THAN N BONUS 1
Rook Attack 1
Pieces over queen bonus 1
Rook over Knight endgame bonus 1
Piece Pawn Score Adjustment 1
Use King Tropism 1
knight tropism 1
bishop tropism 1
rook tropism 1
queen tropism 1
knight tropism opening 1
bishop tropism opening 1
rook tropism opening 1
queen tropism opening 1
knight tropism endgame 1
bishop tropism endgame 1
rook tropism endgame 1
queen tropism endgame 1
Pawn Storm 1
King Attack 1
Tactical Mode 1
MultiPV_cp 1
EGTB Probe Depth 1
EGTB Fifty Move Rule 1
NUMA Offset 1
NUMA Enabled 1
Never Clear Hash 1
Hash File 1
FiftyMoveDistance 1
UCI Log File 1
Hide Redundant Output 1
Own Book 1
Pawn Hash 1
Time Buffer 1
Max Active Splits/Thread 1
Split_Depth 1
Analysis_Contempt 1
Hard_Probe_Depth 1
Soft_Probe_Depth 1
Suppress 1
Magnify 1
Book Moves 1
Smart Syzygy 1
MCTS Hash 1
Use MCTS 1
MCTS Explore 1
Progress Threshold 1
Variety 1
cppn 1
fut 1
MoveOverheadType 1
personalityFile 1
Red depth threshold 1
pvk lo depth 1
pvk hi depth 1
allk lo depth 1
allk hi depth 1
Sudden Divisor 1
Fischer Divisor 1
hmb open 1
hmb end 1
table memory 1
ScaleMaterial 1
ScaleKingSafety 1
LogLevel 1
UseNNUE 1
Level 1
nodesBasedLevel 1
MateFinder 1
RandomOpen 1
MinMoveOverHead 1
ContemptMG 1
WDL_display 1
bongCloud 1
NNUEFile 1
forceNNUE 1
NNUEScaling 1
NNUEThreshold 1
GenFen 1
GenFenDepth 1
GenFenDepthEG 1
RandomPly 1
StyleAttack 1
StyleComplexity 1
StyleDevelopment 1
StyleMaterial 1
StyleMobility 1
StylePositional 1
StyleForwardness 1
UCI_RatingAdv 1
Evalcorrect 1
UserP1 1
UserP2 1
UserP3 1
UserP4 1
UserP5 1
UserP6 1
UserQ1 1
UserQ2 1
UserQ3 1
UserQ4 1
UserQ5 1
UserQ6 1
BF_Net_Trigger 1
BF_Depth 1
BF_Stat 1
BF_Capture 1
BF_Imp 1
BF_R1 1
BF_R2 1
BF_D1 1
BF_D2 1
BF_D3 1
NM_Net_Trigger 1
NM_Base 1
NM_PV 1
NM_Depth 1
NM_Imp 1
NM_Threat 1
NM_Stat 1
NM_V_Depth 1
PC_Net_Trigger 1
AF_Threat 1
AF_Lesser_Threat 1
AF_Imp 1
AF_Base 1
AF_Depth_Weight 1
Move on Ponderhit 1
UseBook 1
VerboseBook 1
Allow Large Pages 1
BookBestMove 1
Move_Overhead 1
NNUENetpath 1
Use_NNUE 1
Play level 1
Search Direction 1
FixedDepth 1
LogFileName 1
Rook Contact Check Bonus 1
LSN filtering 1
LSN Time Margin (sec) 1
LSN Value Margin 1
Single Evasion Extension (PV nodes) 1
Single Evasion Extension (non-PV nodes) 1
Use Debug Log 1
Idle Threads Sleep 1
winning_optimism_pieces_us 1
winning_optimism_pawns_us 1
winning_optimism_mobility_us 1
winning_optimism_pieces_them 1
winning_optimism_pawns_them 1
winning_optimism_mobility_them 1
losing_optimism_pieces_us 1
losing_optimism_pawns_us 1
losing_optimism_mobility_us 1
losing_optimism_pieces_them 1
losing_optimism_pawns_them 1
losing_optimism_mobility_them 1
UseNullMove 1
MinProbeDepth 1
AnalysisAgeHash 1
Toga Exchange Bonus 1
Hash Pruning 1
Hash Pruning Depth 1
Hash Pruning Margin 1
Clear_Hash 1
OwnBook_File 1
OwnBook_Depth 1
OwnBook_Variety 1
Temperature 1
TempDecayMoves 1
TempCutoffMove 1
TempEndgame 1
TempValueCutoff 1
TempVisitOffset 1
DirichletNoise 1
FpuStrategyAtRoot 1
FpuValueAtRoot 1
KLDGainAverageInterval 1
MinimumKLDGainPerNode 1
Slowmover 1
ImmediateTimeUse 1
TwoFoldDraws 1
MaxCollisionVisitsScalingStart 1
MaxCollisionVisitsScalingEnd 1
MaxCollisionVisitsScalingPower 1
MaxOutOfOrderEvalsFactor 1
PerPVCounters 1
MovesLeftMaxEffect 1
MovesLeftThreshold 1
MovesLeftSlope 1
MovesLeftConstantFactor 1
MovesLeftScaledFactor 1
MovesLeftQuadraticFactor 1
MaxConcurrentSearchers 1
DrawScoreSideToMove 1
DrawScoreOpponent 1
DrawScoreWhite 1
DrawScoreBlack 1
NodesPerSecondLimit 1
SolidTreeThreshold 1
MultiGather 1
TaskWorkers 1
MinimumProcessingWork 1
MinimumPickingWork 1
MinimumRemainingPickingWork 1
MinimumPerTaskProcessing 1
IdlingMinimumWork 1
ThreadIdlingThreshold 1
UCI_ShowMovesLeft 1
SmartPruningMinimumBatches 1
TimeManager 1

[Steve Maughan]

Hi Chris,

I can see this as a strength and a weakness. It's a strength in that the UCI standard gives the programmer the ability to have whatever options they want. And it's a weakness as GUI programmers would like to have a standard set of options.

What do you think needs to be changed?

— Steve

[lithander]

The list where the options are sorted by frequency is a great first step in establishing standards, imo.

[hgm]

GUIs would only benefit from standardization by options that a user would like to be uniformly applied to all engines. Such as hash size, number of search threads, EGT path. For options that control some unique or rare feature, or options that likely have different meaning for different engines (such as eval parameters), centralized control is not useful.

[chrisw]

The list where the options are sorted by frequency is a great first step in establishing standards, imo.

Frequency split the list into it's two uses.

These first ones really are for users:

Sorted by frequency:

Hash 192
Ponder 163
Threads 143
MultiPV 129
OwnBook 93
SyzygyPath 77
Clear Hash 72
UCI_Chess960 64
SyzygyProbeDepth 51
Contempt 47
Syzygy50MoveRule 34
BookFile 34
SyzygyProbeLimit 33
UCI_AnalyseMode 32
UCI_LimitStrength 31
UCI_Elo 31
Book File 29
Skill Level 28


What comes after are for developers making tuning adjustments (basically).
Could be interesting if somebody wrote a universal SPSA tuner for search tuning.

Python code, if anyone wants to add to the engines list ...

https://github.com/ChrisWhittington/UCIOptionsCompiler

[chrisw]

GUIs would only benefit from standardization by options that a user would like to be uniformly applied to all engines. Such as hash size, number of search threads, EGT path. For options that control some unique or rare feature, or options that likely have different meaning for different engines (such as eval parameters), centralized control is not useful.

One would not want to fiddle with eval params by UCIOptions, Texel tuning is way better. Search parameters are another matter though.

[hgm]

Well, apparently a lot of engines do use UCI options for this. Which is probably the reason the list is so long.

[chrisw]

Well, apparently a lot of engines do use UCI options for this. Which is probably the reason the list is so long.

There's a lot of legacy engines in there. Nowadays HCE is done by Texel or some form of regression tuning using labelled positions.

[abulmo2]

The following options are part of the official specification: https://www.shredderchess.com/download/div/uci.zip

Hash
NalimovPath
NalimovCache
Ponder
OwnBook
MultiPV
UCI_ShowCurrLine
UCI_ShowRefutations
UCI_LimitStrength
UCI_Elo
UCI_AnalyseMode
UCI_Opponent
UCI_EngineAbout
UCI_ShredderbasesPath
UCI_SetPositionValue

The following options can be found as examples:
Nullmove
Selectivity
Style
Clear Hash