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Up Topic The Rybka Lounge / Computer Chess / BUG: Black Diamond 'Syzygy50MoveRule' NO OFF
- By MrKris (***) Date 2020-03-16 03:00
Description:
Honey branch, Mar 10, 2020: https://github.com/MichaelB7/Stockfish/tree/honey
I compiled all once with the included build.sh (Linux, 64-bit modern).

6-piece ending, 1-0 in over 50 moves, 1/2-1/2 if 50 move rule:
6R1/8/8/2n4K/8/k1b5/8/3B4 b - - 0 1


All with 6-piece and Syzygy50MoveRule ▢ unchecked (from default checked):

all detected the loss except Black-Diamond which kept acting as if Sy50mr was on.

Screenshots:
1) Example of the correct result (as with all except Black-Diamond),
Cute Ches -10.00 resign score setting triggered by black's -100.00, Syzygy loss found.
Note low TB hits, probing stopped by loss(es).

2) Black-Diamond in Arena showing Sy50mr ▢ unchecked and erroneously not detecting the loss.

3) Stockfish-FD white detects the win but Black-Diamond black does not and shows a drawish score instead of losing.
Draw forced by Cute Chess setting: Move number 2, Move count 0, Score 0.16
Note Black-Diamond's high TB hits: continued probing instead of being stopped by loss(es).
Black-Diamond Sy50mr ▢ unchecked verified by ~/.config/cutechess/engines.json {file for cutechess-cli & Cute Chess GUI}
... {
                "command" : "./Black-Diamond",
    "name" : "Black-Diamond",
... {
        "alias" : "",
        "default" : true,
        "name" : "Syzygy50MoveRule",
        "type" : "check",
        "value" : false
      }, ...
Up Topic The Rybka Lounge / Computer Chess / BUG: Black Diamond 'Syzygy50MoveRule' NO OFF

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