Blog "Chess Engines Diary" - needs a new laptop for chess engine tests

♔ We use for testing only 2 old laptops:
1. Acer - Intel Core i3-3217U ( 5 years old)
2. Lenovo - Intel Core i7-4710MQ is over 3 years old (He works 24 hours a day)

♕♞ A modern laptop that will be designed only for chess engine tests costs (with software) about $ 1000-1200 (4200-4500 PLN). We will no longer invest private money, and chess engine testing costs are big. That is why we are starting the collection for the purchase of a laptop for testing.

♕ Our blog "Chess Engines Diary" is visited by around 2,000-3.000 users daily. If only everyone paid 1 dollar - we will pay the required amount in one day!


Monday, November 9, 2015

Stockfish 15110311 - new development version very strong chess engine UCI

Stockfish - chess engines UCI

Previous version chess engine Stockfish 

Author compilation - 
Marco Costalba

Information on the compilation:
Get rid of timer thread 

Unfortunately std::condition_variable::wait_for() is not accurate in general case and the timer thread can wake up also after tens or even hundreds of millisecs after time has elapsded. CPU load, process priorities, number of concurrent threads, even from 
other processes, will have effect upon it. 

Even official documentation says: "This function may block for longer than timeout_duration due to scheduling or resource contention delays." 

So retire timer and use a polling scheme based on a local thread counter that counts search() calls and a small trick to keep polling frequency constant, independently from the number of threads. 

Tested for no regression at very fast TC 2+0.05 th 7: 
LLR: 2.96 (-2.94,2.94) [-3.00,1.00] 
Total: 32969 W: 6720 L: 6620 D: 19629 

TC 2+0.05 th 1: 
LLR: 2.95 (-2.94,2.94) [-3.00,1.00] 
Total: 7765 W: 1917 L: 1765 D: 4083 

And at STC TC, both single thread 
LLR: 2.96 (-2.94,2.94) [-3.00,1.00] 
Total: 15587 W: 3036 L: 2905 D: 9646 

And with 7 threads 
LLR: 2.95 (-2.94,2.94) [-3.00,1.00] 
Total: 8149 W: 1367 L: 1227 D: 5555 

bench: 8639247


 Stockfish 15110311 - download

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