user1751: I'm hosting a chess night and would like to post a few wallchart puzzles but would like to discourage folks from secretly whipping out their phone's chess app/engine and scoring points unfairly.
For example, something like this every-Russian-schoolboy-knows endgame breakthrough position here with white to move where removing the Kings renders the position invalid/illegal by most engines, yet still has enough context to give a person a visualization/calculation challenge if they've not seen it before.


user3884: You're not going to be able to do this if your attendees actually want to cheat. If you give me a position without kings, I can simply edit the chessvision analysis board by putting a king somewhere I think is reasonable and get around your system.
However, if instead of preventing them from cheating, you encourage everyone to work together in teams on positions (and make sure the puzzles aren't too hard so that frustrated players will seek to quit the charade and bust out an engine), you're likely to make a better environment for everyone. Hopefully you don't have a big prize to the winner (or winning team) as well. For instance, I would suggest something non-monetary. If the only thing someone is likely to get out of the puzzle night is the satisfaction of a job well done, then nobody is likely to cheat.

1751: <p>I'm hosting a chess night and would like to post a few wallchart puzzles but would like to discourage folks from secretly whipping out their phone's chess app/engine and scoring points unfairly.</p>
<p>For example, something like this <em>every-Russian-schoolboy-knows</em> endgame breakthrough position here with white to move where removing the Kings renders the position <strong>invalid/illegal</strong> by most engines, yet still has enough context to give a person a visualization/calculation challenge if they've not seen it before.</p>
<p><a href="https://i.stack.imgur.com/YcjGJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/YcjGJ.png" alt="enter image description here" /></a></p>
 3884: <p>You're not going to be able to do this if your attendees actually want to cheat. If you give me a position without kings, I can simply edit the chessvision analysis board by putting a king somewhere I think is reasonable and get around your system.</p>
<p>However, if instead of preventing them from cheating, you encourage everyone to work together in teams on positions (and make sure the puzzles aren't too hard so that frustrated players will seek to quit the charade and bust out an engine), you're likely to make a better environment for everyone. Hopefully you don't have a big prize to the winner (or winning team) as well. For instance, I would suggest something non-monetary. If the only thing someone is likely to get out of the puzzle night is the satisfaction of a job well done, then nobody is likely to cheat.</p>
