CEGT - rating lists March 24th 2019

[jdart]

How can I create a log file with this wb engine using winboard ?

-debugMode true should show all the commands winboard sends and receives.

--Jon

[tpoppins]

in a short testmatch with 100 games I have had around 50 games lost due to an illegale move:

[pgn] [Event "Computer Chess Game"] [Site "DESKTOP-K5TPRSK"] [Date "2019.03.29"] [Round "15"] [White "Schooner 2.0.34 x64 1CPU"] [Black "Xiphos 0.5 x64 1CPU"] [Result "0-1"] [ECO "E81"] [Annotator "9. +0.51 9... -0.20"] [PlyCount "34"] [EventDate "2019.??.??"] [TimeControl "40/480:0"] 1. d4 Nf6 2. c4 g6 3. f3 c5 4. d5 Bg7 5. e4 d6 6. Nc3 O-O 7. Bg5 h6 8. Be3 e6 9. Qd2 {0.51/26 57} exd5 {-0.20/26 13} 10. exd5 {0.56/26 23} h5 {-0.18/26 10} 11. O-O-O {0.55/25 21} a6 {0.00/27 13} 12. Bf4 {0.44/24 14} b5 {0.00/28 9} 13. cxb5 {0.51/25 10} Re8 {0.00/27 11} 14. a3 {0.27/24 57} Qb6 {0.00/27 11} 15. Bc4 {0.19/25 7} Nbd7 {0.52/29 27} 16. Nge2 {0.11/25 10} Ne5 {0.40/29 17} 17. Bxe5 { 0.00/29 24} Rxe5 {0.38/27 13 Xboard: Forfeit due to invalid move: (none) (a1a1 via `0) res=36} 0-1 [/pgn]

Odd. I counted over 700 games I played with v2.0.34, including 400+ 4CPU ones, and only found one game that had to be replayed. It was from the 4CPU test, but I cannot determine now what was the error or if the error was on Schooner's part.

It's installed as an xboard engine under Cute Chess, using 512 MB hash as well.

I recall seeing precisely this error with another engine. The situation was different but I suspect that underlying cause is the same -- undefined behavior possibly caused by a bug in the hashtable code.

[D Sceviour]

The situation was different but I suspect that underlying cause is the same -- undefined behavior possibly caused by a bug in the hashtable code.

Another possibility may be incompatible mmx or sse hardware. Try using Schooner's non-popcount generic version.

[Werner]

Thank you for the answers. Under Arena I played 1000 games now without any problems.

I tried out Winboard again with log on - and could not repeat this behaviour. I used the same pc.