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Thursday, June 22, 2017

Stockfish 17062122_Kiiski - new version!

Stockfish, chess engine UCI

Leader rating list JCER = 3372
🔬 Author: Joona Kiiski 

More:
Timestamp: 1498077903

Revert "Prefetch earlier in qsearch()"

This reverts commit b73016bb41d4c2fad3126b2e0018d71a36e78331.

No functional change
Closes #1144 


⭐⭐⭐   Stockfish 17062122_Kiiski - download


Chess engine: Aristides 220617 ( C port of Stockfish )

Aristides 220617 - download


Stockfish 17062122 - new version!

Stockfish, chess engine UCI

Leader rating list JCER = 3372
🔬 Author: Joost VandeVondele

More:
Timestamp: 1498077478 

Fix four data races. 

the nodes, tbHits, rootDepth and lastInfoTime variables are read by multiple threads, but not declared atomic, leading to data races as found by -fsanitize=thread. This patch fixes this issue. It is based on top of the CI-threading branch (PR #1129), and should fix the corresponding CI error messages. 

The patch passed an STC check for no regression: 

http://tests.stockfishchess.org/tests/view/5925d5590ebc59035df34b9f 
LLR: 2.96 (-2.94,2.94) [-3.00,1.00] 
Total: 169597 W: 29938 L: 30066 D: 109593 

Whereas rootDepth and lastInfoTime are not performance critical, nodes and tbHits are. Indeed, an earlier version using relaxed atomic updates on the latter two variables failed STC testing (http://tests.stockfishchess.org/tests/view/592001700ebc59035df34924), which can be shown to be due to x86-32 (http://tests.stockfishchess.org/tests/view/592330ac0ebc59035df34a89). Indeed, the latter have no instruction to atomically update a 64bit variable. The proposed solution thus uses a variable in Position that is accessed only by one thread, which is copied every few thousand nodes to the shared variable in Thread. 

No functional change. 

Closes #1130 
Closes #1129 


Stockfish 17061704_snicolet wins JCER Stockfish Test, 2017.06.19 - 2017.06.21



Temp 3' + 3" Hardware: Intel Core i7-4710MQ with 7,9 GB Memory , Windows 10 64-bit
168 Tournament games, GUI-Arena 3.5.1161.651 JCER games download,  until 31.12.2016
 
28.044 JCER games download (from 01.01.2017)  JCER League
Book: Perfect 2017,     Games, engines, book - download       Table created - Scid vs PC

Raubfisch X35b wins JCER Test Tournament, 2017.06.13 - 2017.06.18



Temp 3' + 3" Hardware: Intel Core i7-4710MQ with 7,9 GB Memory , Windows 10 64-bit
650 Tournament games, GUI-Arena 3.5.1161.651 JCER games,  until 31.12.2016
 
28.044 JCER games download (from 01.01.2017)  JCER League
Book: Perfect 2017,     Games, engines, book - download       Table created - Scid vs PC