user8637: I am training endgames using Lucas Chess and playing the position from FEN against Stockfish. But sometimes I would like to have engines play the position with itself. I can achieve this in Lucas Chess easilly with 'Engine Tournament'. But the problem is that there is a FEN position, in 3 moves the evaluation goes to -3 for black and the match ends because engine resigns. 
I would like to force engine to play itself till the very end so I can see the plan used to win the ending. I can of course use additional program and make a move suggested by it (eg. Scid with Stockfish too) but I would like it better to have only one program used. Is there any setting for an engine that can force it?

user825: It's possible, but you'll may need to update the source code.
In https://github.com/lukasmonk/lucaschess/blob/843be9f57baa3f631c05181b1012df844f53c84b/Code/QT/PantallaEntMaq.py
    # Resign
    lbResign = Controles.LB2P(self, _("Resign/draw by engine"))
    liResign = ((_("Very early"), -100),
                (_("Early"), -300),
                (_("Average"), -500),
                (_("Late"), -800),
                (_("Very late"), -1000),
                (_("Never"), -9999999))
    self.cbResign = Controles.CB(self, liResign, -800)

The GUI will resign if the score goes below 800 cp. You can do this:
self.cbResign = Controles.CB(self, liResign, -9999999)

This will disable auto resign for the software.

8637: <p>I am training endgames using Lucas Chess and playing the position from FEN against Stockfish. But sometimes I would like to have engines play the position with itself. I can achieve this in Lucas Chess easilly with 'Engine Tournament'. But the problem is that there is a FEN position, in 3 moves the evaluation goes to -3 for black and the match ends because engine resigns. </p>

<p>I would like to force engine to play itself till the very end so I can see the plan used to win the ending. I can of course use additional program and make a move suggested by it (eg. Scid with Stockfish too) but I would like it better to have only one program used. Is there any setting for an engine that can force it?</p>
 825: <p>It's possible, but you'll may need to update the source code.</p>

<p>In <a href="https://github.com/lukasmonk/lucaschess/blob/843be9f57baa3f631c05181b1012df844f53c84b/Code/QT/PantallaEntMaq.py" rel="nofollow noreferrer">https://github.com/lukasmonk/lucaschess/blob/843be9f57baa3f631c05181b1012df844f53c84b/Code/QT/PantallaEntMaq.py</a></p>

<pre><code>    # Resign
    lbResign = Controles.LB2P(self, _("Resign/draw by engine"))
    liResign = ((_("Very early"), -100),
                (_("Early"), -300),
                (_("Average"), -500),
                (_("Late"), -800),
                (_("Very late"), -1000),
                (_("Never"), -9999999))
    self.cbResign = Controles.CB(self, liResign, -800)
</code></pre>

<p>The GUI will resign if the score goes below 800 cp. You can do this:</p>

<pre><code>self.cbResign = Controles.CB(self, liResign, -9999999)
</code></pre>

<p>This will disable auto resign for the software.</p>
