OK, i dont know how the dynamics in your club works. As the social function plays a role here i would suggest that you just j'adoube the piece the first time. Should it happen a second time, press his clock and say: "get your pieces straight!" and only if it happens the third time, stop clock and call for referee support. Dont do it the first time, it looks weird in a small club (i thought this was going to happen in an open tournament).
Referring social contacts, there are also other possibilities, you can show them endgames or studies or you can analyze games with them or just sit aside and watch and shit chat a bit ;-)
Be careful with „pressing back“ the clock. Since a „null-move“ is explicitly considered an illegal move as of 2017 if I am not mistaken.
Stopping the clock and calling for the arbiter, universal remedy. What else? Self-justice?
yeah, @Sarg0n is right. Just j'adoube the piece or stop clock and call arbiter.
@Sarg0n yup stop the clock and ask for the arbiter is what i will do funny thing is arbiter was actually watching the game and said nothing :P and when the pieces was being placed the player tried to place the queen out of the pin it was in XD
@nh78 i cannot pronounce j'adoube i'll just say adjust also my opponent is knocking the pieces over not me all good thanks guys for the advice :D
@hurryupdude wut? this already happened? You should have provided this information. https://en.wikipedia.org/wiki/XY_problem
What happened when the player put the piece on the wrong square?
If opponent knocks piece over and press the clock. I believe one can press the clock without making a move so opponent re-establish the correct position on his own time. Am I right?
Rule 7.5.3 renders 7.4.1 as an exception in this regard.
#16 I can only recommend to use caution with pressing back, just stop the clock. Reinforcing the rules is the job of the arbiter. Pressing back the clock can be considered self-justice and as well as as replying with an illegal move. The arbiter decides what is applicable.
#15 By FIDE rules, if the piece is on the wrong square, that's an illegal move. By FIDE blitz rules, an illegal move loses the game.
As Sarg0n says, be careful with pressing the clock. This is common practice in some places, but you risk being penalized yourself!
See the comments to 7.4.1-7.4.3 in the latest Arbiter's Manual:
http://arbiters.fide.com/images/stories/downloads/2018/Arbiters-Manual-2018-v1.pdf
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