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I was trying to play chess on the included chess app on mac, and after the computer's turn, it will not allow me to make any move at all, and I am 100% sure I am not in check as the game just started, still I cannot move a single piece. It does this everytime, has anyone ever experienced it? or knows how to fix it? Here is a screen shot of the app, I am whites and it will not let me move anything.

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    Please mention the software. If possible share any screenshot/logfile. Else it is impossible to understand the problem. – Amlan Saha Kundu Jul 20 '20 at 18:46
  • I have clarified the question. – RSM Jul 21 '20 at 0:10
  • @RSM, try clearing the cache of the application. Hope it helps. OR you can try reinstalling the program. – Amlan Saha Kundu Jul 21 '20 at 8:13
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I think that when you started a new game you accidentally choose the Variant "Suicide" or "Losers". (It might be preselected now that you have selected it once.)

Why would this explain the situation?

In these Variations of chess (you might know them as antichess, the losing game, giveaway chess, suicide chess, killer chess, must-kill, take-all chess, capture chess or losums (according to wikipedia)) you win by having all your pieces captured. The trick is that you have to take every piece that you can take and may not make other moves as long as you can capture anything.

In this position black has offered you a pawn on b5 and you will have to take it with your bishop. All other moves are illegal.

Why I think this is what happened

My guess is based on the position: The computer wouldn't normally just throw away so many pieces (including it's queen). It's pretty hard to come up with a way the game might have gone to end up in this position if the black wasn't pruning it's pieces on purpose.

Also when you selected a variation once, then it will be preselected for the next games until you change it.

What to do about it?

(If you still have the game open, try capturing the pawn with your bishop. If this is possible then you will have confirmed that this was the problem.)

When starting a new game, select the variant "Regular". You will be able to make normal moves now. (You might notice that the computer is much stronger now and not throwing away it's pieces so easily. Consider adjusting how much the computer thinks ahead in the "new game" menue)

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    Indeed that was the, I unintentionally must have changed that mode at some point. Thank you for all the help. – RSM Jul 24 '20 at 19:53

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