Hello, <div><br /></div><div>Try to set </div><div><a href="https://manual.cp2k.org/trunk/CP2K_INPUT/EXT_RESTART.html#CP2K_INPUT.EXT_RESTART.RESTART_CONSTRAINT" title="CP2K_INPUT.EXT_RESTART.RESTART_CONSTRAINT" style="caret-color: rgb(64, 64, 64); font-family: Lato, proxima-nova, "Helvetica Neue", Arial, sans-serif; font-size: 16px; box-sizing: border-box; color: rgb(155, 89, 182); cursor: pointer; overflow-wrap: anywhere;">RESTART_CONSTRAINT</a><span style="color: rgb(155, 89, 182); caret-color: rgb(64, 64, 64); font-family: Lato, proxima-nova, "Helvetica Neue", Arial, sans-serif; font-size: 16px;"> FALSE</span></div><div>in EXT_RESTART section</div><div><br /></div><div>Regards</div><div>Marcella</div><div><br /></div><div><br /></div><div><br /></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Monday, November 3, 2025 at 9:18:13 AM UTC+1 tuncer...@gmail.com wrote:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><p>Hello,</p>
<p>I’m running constrained DFT-MD in CP2K and trying to reduce a bond distance from 3.00 Å to 1.50 Å in two steps.</p>
<ul>
<li>
<p>Step 1 (3.00 → 2.25 Å): worked as expected.</p>
</li>
<li>
<p>Step 2 (2.25 → 1.50 Å): I restart from the step-1 run, but the distance stays at 2.25 Å throughout and never moves toward 1.50 Å</p></li></ul><div>What might be the reason for that? Please find the input file as attached.</div><div><br></div><div>Regards,</div><div>Hasan</div></blockquote></div>
<p></p>
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