Re: [Scidvspc-users] Bug between ScidVsPC and Stockfish

[Steve A <ste...@gm...>]

I cant see the bug report, even after joining their bugzilla.

But if they are happy to have their app crash with very reasonable
input... i guess we should probably add a safeguard to handle it.
Stockfish does many unfriendly things in a way *no* other engine does.

This should handle it (also attached) and will probably get comitted,
but as my version of SF doesnt crash, i cant test it.

Index: tcl/tools/analysis.tcl
===================================================================
--- tcl/tools/analysis.tcl    (revision 2523)
+++ tcl/tools/analysis.tcl    (working copy)
@@ -3544,6 +3544,9 @@
         append cmd { [ } " after $delay sendPosToEngineUCI $n $delay " { ] }
         set analysis(after$n) [eval [list after idle $cmd]]
     } else {
+        if {[sc_pos moves] == {}} {
+          return
+        }
         ### Dont send position if annotating and in book
     if { $::annotate(Engine) == $n && ! $::wentOutOfBook &&
$::useAnalysisBook} {
       bookAnnotation

On Fri, Apr 22, 2016 at 12:27 AM, Alex Wood <al...@un...> wrote:
> Hi,
>
> I configured ScidVsPC to use the Stockfish chess engine and noticed an
> issue where Stockfish would crash when asked to evaluate a position
> already in checkmate.  This issues happens frequently if Stockfish is
> running during the checkmate in N training.  Solving the puzzle results
> in a crash.
>
> I filed a bug on the issue at
> https://bugzilla.redhat.com/show_bug.cgi?id=1325013 but the maintainer
> attributed the issue to Stockfish being asked to evaluate an invalid
> move.  Here's the engine log of an example crash:
>
> Engine: readyok
> Scid  : position fen 4k3/8/4K2Q/8/8/8/8/8 w - - 3 8
> Scid  : go infinite
> [...] Engine analysis here
> Scid  : stop
> Scid  : isready
> Engine: readyok
> Engine: bestmove h6h8
> Scid  : position fen 4k3/8/4K2Q/8/8/8/8/8 w - - 3 8 moves h6h8
> Scid  : go infinite
> Engine: info depth 0 score mate 0
> Scid  : stop
> Scid  : isready
> Engine: readyok
> Scid  : position fen 4k3/8/4K2Q/8/8/8/8/8 w - - 3 8 moves h6h8
> Scid  : go infinite
> Engine: bestmove (none)
> Note: Engine terminated without warning.
> Note: Engine terminated without exit code: "\"$standard_error\""
>
> Any thoughts or help would be greatly appreciated!
> ------------
> Regards,
> Alex
>
>
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