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uci-options.md

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Valid UCI Engine Options

Stockfish

'Debug Log File type string default',
'Threads type spin default 1 min 1 max 512',
'Hash type spin default 16 min 1 max 33554432',
'Clear Hash type button',
'Ponder type check default false',
'MultiPV type spin default 1 min 1 max 500',
'Skill Level type spin default 20 min 0 max 20',
'Move Overhead type spin default 10 min 0 max 5000',
'Slow Mover type spin default 100 min 10 max 1000',
'nodestime type spin default 0 min 0 max 10000',
'UCI_Chess960 type check default false',
'UCI_AnalyseMode type check default false',
'UCI_LimitStrength type check default false',
'UCI_Elo type spin default 1350 min 1350 max 2850',
'UCI_ShowWDL type check default false',
'SyzygyPath type string default <empty>',
'SyzygyProbeDepth type spin default 1 min 1 max 100',
'Syzygy50MoveRule type check default true',
'SyzygyProbeLimit type spin default 7 min 0 max 7',
'Use NNUE type check default true',
'EvalFile type string default nn-6877cd24400e.nnue'

LC0

'WeightsFile type string default <autodiscover>',
'Backend type combo default cuda-auto var cuda-auto var cuda var cuda-fp16 var random var check var recordreplay var roundrobin var multiplexing var demux',
'BackendOptions type string default',
'Threads type spin default 2 min 1 max 128',
'NNCacheSize type spin default 200000 min 0 max 999999999',
'MinibatchSize type spin default 256 min 1 max 1024',
'MaxPrefetch type spin default 32 min 0 max 1024',
'CPuct type string default 1.745000',
'CPuctBase type string default 38739.000000',
'CPuctFactor type string default 3.894000',
'TwoFoldDraws type check default true',
'VerboseMoveStats type check default false',
'FpuStrategy type combo default reduction var reduction var absolute',
'FpuValue type string default 0.330000',
'CacheHistoryLength type spin default 0 min 0 max 7',
'PolicyTemperature type string default 1.359000',
'MaxCollisionEvents type spin default 917 min 1 max 65536',
'MaxCollisionVisits type spin default 80000 min 1 max 100000000',
'MaxCollisionVisitsScalingStart type spin default 28 min 1 max 100000',
'MaxCollisionVisitsScalingEnd type spin default 145000 min 0 max 100000000',
'MaxCollisionVisitsScalingPower type string default 1.250000',
'OutOfOrderEval type check default true',
'MaxOutOfOrderEvalsFactor type string default 2.400000',
'StickyEndgames type check default true',
'SyzygyFastPlay type check default false',
'MultiPV type spin default 1 min 1 max 500',
'PerPVCounters type check default false',
'ScoreType type combo default centipawn var centipawn var centipawn_with_drawscore var centipawn_2019 var centipawn_2018 var win_percentage var Q var W-L',
'HistoryFill type combo default fen_only var no var fen_only var always',
'MovesLeftMaxEffect type string default 0.034500',
'MovesLeftThreshold type string default 0.000000',
'MovesLeftSlope type string default 0.002700',
'MovesLeftConstantFactor type string default 0.000000',
'MovesLeftScaledFactor type string default 1.652100',
'MovesLeftQuadraticFactor type string default -0.652100',
'MaxConcurrentSearchers type spin default 1 min 0 max 128',
'DrawScoreSideToMove type spin default 0 min -100 max 100',
'DrawScoreOpponent type spin default 0 min -100 max 100',
'DrawScoreWhite type spin default 0 min -100 max 100',
'DrawScoreBlack type spin default 0 min -100 max 100',
'NodesPerSecondLimit type string default 0.000000',
'SolidTreeThreshold type spin default 100 min 1 max 2000000000',
'MultiGather type check default tru',
'MultiGather type check default true',
'TaskWorkers type spin default 4 min 0 max 128',
'MinimumProcessingWork type spin default 20 min 2 max 100000',
'MinimumPickingWork type spin default 1 min 1 max 100000',
'MinimumRemainingPickingWork type spin default 20 min 0 max 100000',
'MinimumPerTaskProcessing type spin default 8 min 1 max 100000',
'IdlingMinimumWork type spin default 0 min 0 max 10000',
'ThreadIdlingThreshold type spin default 1 min 0 max 128',
'SyzygyPath type string default',
'Ponder type check default true',
'UCI_Chess960 type check default false',
'UCI_ShowWDL type check default false',
'UCI_ShowMovesLeft type check default false',
'ConfigFile type string default lc0.config',
'SmartPruningFactor type string default 1.330000',
'SmartPruningMinimumBatches type spin default 0 min 0 max 10000',
'RamLimitMb type spin default 0 min 0 max 100000000',
'MoveOverheadMs type spin default 200 min 0 max 100000000',
'TimeManager type string default legacy',
'LogFile type string default'