DA, DB, DC, DD, DE, DF, DG, DH

DI, DJ, DK, DL

[ SmokeDetector | MS ] Few unique characters in answer (87): Solving the Gobblet game by user807424 on math.SE

Here is a problem statement question on intersections of subgroups (with a very small counter-example which could be found via a quick check...!).

@user1729 Nice catch! It is now closed.

PSQ.

@JoséCarlosSantos ^^^ Please help to close the above PSQ. Maybe next time you won't answer such a poor question.

@amWhy No problem. I have already asked the moderators to delete my answer.

@JoséCarlosSantos Thanks!

Total nonsense.

How did this completely wrong answer get 3 upvotes?

D1, D2, D3.

D4, D5, D6.

D7, D8, D9.

D10, D11, D12.

@user21820 If it's "completely wrong" doesn't it warrant a comment to that effect? For me it looks plausible, but I have not bothered to check it (I trust you that it's wrong, but it's wrongness should be communicated better than just a note here and not there.)