TCEC

TCEC (Top Chess Engine Championship) is a computer chess tournament organized and maintained by Chessdom at https://tcec-chess.com/. This page documents Leela configuration in each of the "seasons" of this tournament.

Season 20

Division	Executable	Network	Placement	Result
SuFi	v0.27.0-dev PR1483	J94-100	2/2	47/100
DivP	v0.26.3	66740	1/8	38/56

SuFi Ordo evaluation:

   # ENGINE                                      :  RATING  ERROR  CFS(%)    W    D    L   GAMES  DRAWS(%)
   1 Stockfish 20210113                          :      21     49    79.8   14   78    8     100      78.0
   2 LCZero 0.27.0d-Tilps-dje-magic_JH.94-100    :       0   ----     ---    8   78   14     100      78.0

LC0 hardware and settings:

• Hardware: 4x V100 + Xeon 8163 CPU @ 2.50GHz, 32 vcores
• Non-default parameters:
  • MoveOverheadMs=1000
  • StrictTiming=true
  • Backend=demux
  • BackendOptions=backend=cuda-fp16,res_block_fusing=true,(gpu=0),(gpu=1),(gpu=2),(gpu=3)
  • NNCacheSize=20000000
  • MinibatchSize=320
  • MaxPrefetch=160
  • MaxCollisionEvents=917
  • MaxOutOfOrderEvalsFactor=2.4
  • SmartPruningMinimumBatches=300
  • RootHasOwnCpuctParams=false
  • CPuct=1.745
  • CPuctBase=38739
  • FpuValue=0.330
  • CPuctFactor=3.894
  • PolicyTemperature=1.359
  • MovesLeftMaxEffect=0.2
  • MovesLeftThreshold=0.0
  • MovesLeftSlope=0.004
  • MovesLeftQuadraticFactor=0.0
  • MovesLeftScaledFactor=1.0
  • TimeManager=legacy(steepness=4.0)
• Added/Changed for SuFi:
  • NNCacheSize=50000000
  • RamLimitMb=96000

Season 19

Division	Executable	Network	Placement	Result
SuFi	v0.26.3-rc1	J92-190	2/2	45.5/100
DivP	v0.26.2-rc1	J92-100	2/8	32.5/56

SuFi Ordo evaluation:

   # ENGINE                                    :  RATING  ERROR  CFS(%)    W    D    L   GAMES  DRAWS(%)
   1 Stockfish 202009282242_nn-baeb9ef2d183    :      32     49    89.7   18   73    9     100      73.0
   2 LCZero v0.26.3-rc1_T60.SV.JH.92-190       :       0   ----     ---    9   73   18     100      73.0

LC0 hardware and settings:

• Hardware: 4x V100 + Xeon 8163 CPU @ 2.50GHz, 32 vcores
• Non-default parameters:
  • MoveOverheadMs=1000
  • StrictTiming=true
  • Backend=demux
  • BackendOptions=backend=cudnn-fp16,custom_winograd=true,(gpu=0),(gpu=1),(gpu=2),(gpu=3)
  • NNCacheSize=20000000
  • MinibatchSize=320
  • MaxPrefetch=160
  • MaxCollisionEvents=917
  • MaxOutOfOrderEvalsFactor=2.4
  • SmartPruningMinimumBatches=600
  • MovesLeftMaxEffect=0.2
  • MovesLeftThreshold=0.862976
  • MovesLeftSlope=0.0004
• Added/Changed for SuFi:
  • BackendOptions=backend=cudnn-fp16,custom_winograd=true,res_block_fusing=true,(gpu=0),(gpu=1),(gpu=2),(gpu=3)
  • MovesLeftThreshold=0.0
  • MovesLeftSlope=0.004
  • MovesLeftQuadraticFactor=0.0
  • MovesLeftScaledFactor=1.0

Season 18

Division	Executable	Network	Placement	Result
SuFi	v0.25.1	svjio-t60-3972-mlh	2/2	46.5/100
DivP	v0.25.1	sv-t60-3010	2/8	24.5/42

SuFi Ordo evaluation:

   # ENGINE                               :  RATING  ERROR  CFS(%)    W    D    L   GAMES  DRAWS(%)
   1 Stockfish 202006170741               :      25     49    83.6   23   61   16     100      61.0
   2 LCZero v0.25.1-svjio-t60-3972-mlh    :       0   ----     ---   16   61   23     100      61.0

LC0 hardware and settings:

• Hardware: 4x V100 + Xeon 8163 CPU @ 2.50GHz, 32 vcores
• Non-default parameters:
  • MoveOverheadMs=1000
  • StrictTiming=true
  • Backend=demux
  • BackendOptions=backend=cudnn-fp16,custom_winograd=true,(gpu=0),(gpu=1),(gpu=2),(gpu=3)
  • NNCacheSize=20000000
  • MinibatchSize=320
  • MaxPrefetch=160
  • MaxCollisionEvents=917
  • MaxOutOfOrderEvalsFactor=2.4
  • SmartPruningMinimumBatches=600
• Added for SuFi:
  • MovesLeftMaxEffect=0.2
  • MovesLeftThreshold=0.0
  • MovesLeftSlope=0.007
  • MovesLeftQuadraticFactor=0.0
  • MovesLeftScaledFactor=1.0
  • MovesLeftConstantFactor=0.0

Season 13

Division	Executable	Network	Placement	Result
Div4	lc0 "v0.16.1" (b1301aa9)	10161	1st place	22.0/28
Div3	lc0 "v0.16.1" (b1301aa9)	10520	3rd place	16.0/28

• Hardware: TCEC GPU server has 2x GTX 1080 ti. Full specs here
• Command line: lc0 -w 10161 -t 4 --minibatch-size=512 --backend=multiplexing "--backend-opts=(backend=cudnn,gpu=0),(backend=cudnn,gpu=1)" --nncache=2000000 -l lc0debug.txt
• UCI: Move time overhead in milliseconds=2000
  • Div3 added: Time weight curve peak ply=37; Aggressive smart pruning threshold=0.604; Scale thinking time=3.05;

TCEC "v0.16.1" binary from appveyor

TCEC S13 issues

Bonus games 7-10-2018

• Net IDs: kb3 and id481
• Hardware: TheAnswer volunteered 2x1080 ti via ssh access.
• Command line: ./lc0 -w [kb3|id481] --backend=multiplexing '--backend-opts=a(backend=cudnn,threads=2,gpu=0),b(backend=cudnn,threads=2,gpu=1)' -t 4 (kb1 and default respectively with increased move overhead to help with latency).

Season 12

• Versions
  • Div4: lczero v0.10, ID125 - +0 -25 =2 (and 1 win by forfeit)
• Hardware: TCEC CPU server 2 x 8 core Intel Xeon E5-2689 @ 3300 MHz
• Command line: lczero -w id125 ....?