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 18

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

• Hardware: 4x V100 + Xeon 8163 CPU @ 2.50GHz, 32 vcores
• Non-default parameters:
  • MoveOverheadMs=1000
  • 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
  • StrictUciTiming=true
• 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 ....?