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!


Thursday, August 3, 2017

Stockfish 17080203 - new version!

Stockfish, chess engine UCI

Leader rating list JCER = 3331
🔬 Author: Rocky640

Timestamp: 1501637874 

Rework the "unsupported" penalty into a "supported" bonus 

A pawn (according to all the searched positions of a bench run) is not supported 85% of the time, (in current master it is either isolated, backward or "unsupported"). 

So it made sense to try moving the S(17, 8) "unsupported" penalty value into the base pawn value hoping for a more representative pawn value, and accordingly 
a) adjust backward and isolated so that they stay more or less the same as master 
b) increase the mg connected bonus in the supported case by S(17, 0) and let the Connected formula find a suitable eg value according to rank. 

Tested as a simplification SPRT(-3, 1) 

LLR: 2.95 (-2.94,2.94) [-3.00,1.00] 
Total: 19613 W: 3663 L: 3540 D: 12410 

LLR: 2.95 (-2.94,2.94) [-3.00,1.00] 
Total: 24721 W: 3306 L: 3191 D: 18224 

Bench: 5581946 
Closes #1179 

⭐⭐⭐   Stockfish 17080203 - download

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