Polyglot and playing by nodes

[Michel]

It seems the issue is pondering. If I use

xboard -fcp glaurung -fUCI -firstNPS 8000 -xponder

the issue goes away.

[H.G.Muller]

You are absolutely right. The code made no provision for pondering at all. (As node-based matches between engines often have time-odds character, pondering might defeat the purpose.) Pondering even wrecked operation in Two-Machines mode, for which NPS play was meant.

I put in code now to test if the engine producing the Thinking Output is indeed on move or not. Thanks for spotting it, and pinpointing the cause.