Search found 4590 matches

by Ferdy
Tue Apr 20, 2021 6:04 pm
Forum: Computer Chess Club: General Topics
Topic: UCI_Elo 1500 engines and FIDE Elo
Replies: 12
Views: 350

Re: UCI_Elo 1500 engines and FIDE Elo

Uri Blass wrote:
Tue Apr 20, 2021 5:18 pm
I am not sure if regression from 2019 is reliable.

I am not sure if lichess rating X of 2019 is the same as lichess rating X of 2021.
What is your proposal to make the estimates more closer to the truth?
by Ferdy
Tue Apr 20, 2021 6:01 pm
Forum: Computer Chess Club: General Topics
Topic: UCI_Elo 1500 engines and FIDE Elo
Replies: 12
Views: 350

Re: UCI_Elo 1500 engines and FIDE Elo

You should try Cheese 2.2, I changed UCI_Elo calculation, based on a formula from one of your previous post. It's difficult to find a formula that works with all possible ELO values. In Cheese 2.2 there are 2 modes for UCI_Elo, in cheese.ini, UCILimitMode=0 to reduce the speed, or UCILimitMode=1 to...
by Ferdy
Tue Apr 20, 2021 5:58 pm
Forum: Computer Chess Club: General Topics
Topic: UCI_Elo 1500 engines and FIDE Elo
Replies: 12
Views: 350

Re: UCI_Elo 1500 engines and FIDE Elo

Some engines are added. The top 3 are now CT800, Delfi and Stockfish. num engine games fide_elo diff 1 CT800 V1.42 UCI_Elo 1500 100 1515 15 2 Delfi 5.4 UCI_Elo 1500 100 1463 37 3 Stockfish 13 UCI_Elo 1500 100 1539 39 4 Hiarcs 14 UCI_Elo 1500 100 1449 51 5 Maia Lichess 1546 2500 1410 90 6 Danasah 7.9...
by Ferdy
Tue Apr 20, 2021 11:40 am
Forum: Computer Chess Club: General Topics
Topic: UCI_Elo 1500 engines and FIDE Elo
Replies: 12
Views: 350

Re: UCI_Elo 1500 engines and FIDE Elo

Added Cheng 4.40, much better than the previous version. # Player : FIDE Elo Points Played Points(%) 1 Rybka v2.3.2a UCI_Elo 1500 : 2217 99.0 100 99.0 2 Minic 2.51 UCI_Elo 1500 : 2145 98.5 100 98.5 3 Cheese 2.1 UCI_Elo 1500 : 2094 98.0 100 98.0 4 Cheng 4.39 UCI_Elo 1500 : 2054 97.5 100 97.5 5 Honey ...
by Ferdy
Tue Apr 20, 2021 10:02 am
Forum: Computer Chess Club: General Topics
Topic: UCI_Elo 1500 engines and FIDE Elo
Replies: 12
Views: 350

UCI_Elo 1500 engines and FIDE Elo

Maia Lichess 1546 has a blitz Lichess rating of around 1546 . This engine is run with maia-1100.pb.gz net at node 1 on a gauntlet test below. The formula to get FIDE Elo from Lichess Blitz Elo is, FIDE rating = 65 + [0.87 x Lichess Blitz Rating] based from the regression in 2019 . Maia FIDE Elo = 65...
by Ferdy
Mon Apr 19, 2021 5:40 pm
Forum: Computer Chess Club: General Topics
Topic: Algorithm to determine the difficulty of a chess problem
Replies: 6
Views: 382

Re: Algorithm to determine the difficulty of a chess problem

Hello, I am trying to implement a simple algorithm to generate chess problems. It's pretty simple, I analyze lichess game with an engine and when there is a dramatic change in the evaluation, it means something is happening. However, I can't figure out a reliable way to determine the difficulty of ...
by Ferdy
Mon Apr 19, 2021 5:22 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Tuning search parameters
Replies: 3
Views: 319

Re: Tuning search parameters

You can try the following. Chess Tuning Tools Lakas Optuna Game Parameter Tuner I developed the last 2. They can optimize search or eval params or combination thereof. Some optimizers have genetics algo both in Lakas and Optuna. Lakas uses the nevergrad framework while optuna uses the Optuna framew...
by Ferdy
Sun Apr 18, 2021 2:10 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Tuning search parameters
Replies: 3
Views: 319

Re: Tuning search parameters

You can try the following. Chess Tuning Tools Lakas Optuna Game Parameter Tuner I developed the last 2. They can optimize search or eval params or combination thereof. Some optimizers have genetics algo both in Lakas and Optuna. Lakas uses the nevergrad framework while optuna uses the Optuna framewo...
by Ferdy
Sun Apr 18, 2021 1:24 pm
Forum: Computer Chess Club: General Topics
Topic: Meltwater Champions Chess Tour PGN
Replies: 6
Views: 331

Re: Meltwater Champions Chess Tour PGN.

Grischuk is in airthings and indeed he likes to be under time pressure. Time pressure stats in Champions Chess Tour Airthings Masters Prelims 2020 name games pts gtp gtp_perf 0 Carlsen, Magnus 11 6.5 3 0.67 1 Nakamura, Hikaru 11 6.5 2 0.75 2 So, Wesley 11 6.5 0 NaN 3 Nepomniachtchi, Ian 11 6.0 3 0.5...
by Ferdy
Sun Apr 18, 2021 10:25 am
Forum: Computer Chess Club: General Topics
Topic: Meltwater Champions Chess Tour PGN
Replies: 6
Views: 331

Re: Meltwater Champions Chess Tour PGN.

More comprehensive table with perf for those games where a player is in time pressure. Time pressure stats in Meltwater, Champions Chess Tour Skilling Open - Prelims 2020 games pts gtp gtp_perf Carlsen, Magnus 15 9.0 3 0.33 Nakamura, Hikaru 15 9.0 0 NaN Aronian, Levon 15 8.5 5 0.50 Nepomniachtchi, I...