# AMAZING Chess Puzzle From Reddit

Reddit post is here:

n1QBq1k1/5p1p/5KP1/p7/8/8/8/8 w – – 0 1

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1. @Brlitzkreig says:

It's not actually checkmate on the next move because black can move their queen to A5 and thus capture the bishop that would otherwise deliver the check mate.

But it is check mate on the move after that because if white promotes to a queen then that delivers the checkmate.

2. @christopherlperezcruz1507 says:

Why doesn't black move Q to f8? When the K moves for the check he has to move away from the pawn. The Q steps in and sacs but the king can retake and move to f8

3. @BlckJack123 says:

I saw it was a win for white- after I watched the video. π

4. @BlckJack123 says:

Hats off to whoever developed this puzzle! Can you imagine how much effort had to go into figuring something like this out?

5. @lingtao969 says:

this puzzle was covered in a daniel naroditsky video a while while back, title of video is "how to study chess" or something

That is a puzzle of a different league. Or a different tier ! OMG

7. @Jessmaestro69 says:

Black can just move the queen to F8 and then sack/defend against the check on G7, no??? Perhaps white gets the queen promotion out of it but the bishop skewer is at least thwarted

8. @ifer1280 says:

That moment when the king was in a mating net with barely any adjacent pieces, preventing him from delivering checkmate, was magnificent

9. @joergn.1800 says:

βZugzwangβ doesnt know the English Chess uses a German Word for Zugzwang π

10. @JohnDoe-ti2np says:

In 1995, John Nunn shortened a study by Matous to produce this position, as an engine-stumper. It's interesting that it continues to stump engines today, almost 30 years later.

11. @Lombax65 says:

I donβt see why at 5:14 βThereβs one moveβ why canβt black move the queen to f8. Then when the white king moves and puts the black king in check, the queen can block and sacrifice but the king can take the bishop and the last white pawn.

12. @Polymeron says:

Absolutely brain-breaking puzzle.

13. @reubenmanzo2054 says:

To answer the question at 4:52, I once checkmated by castling.

14. @QDWhite says:

I love how stockfish offers the draw and then afterwards is all like, βof course this is winning for white. Wasnβt it obvious?β

15. @hans3893 says:

Just to be accurate until the end: Qf8 is met by Kf5! Qg7 f8Q++ and not Kg5? Qg7+ Kh5 Ne6! -+ π

16. @Ozasuke says:

One of the coolest puzzles I have ever seen! Thank you for sharing and breaking this down!

17. @TheEthikos says:

This puzzle is absolutely beautiful.

18. @KY-qy3kn says:

I saw this recently on some compilation of positions where Stockfish broke, I think the Reddit guy got it from that.

19. @christopherheckman7957 says:

2:14 If Stockfish can see a mate in 11 from the position after White's move, then why can't it see a mate in 12 from the original position?

7:56 and now I think I see why Ba1 at first loses; it's because of a parity condition (due to Black pushing the a-pawn).

Holy ** this is a good one.

8:56 Well, Black doesn't HAVE to promote to a queen … but it doesn't make a difference.

10:10 Hats off should be even more so to the composer (who has been identified in another comment).

20. @hyejinahn6174 says:

Can you bring back the chess adventure series pls

21. @RoboSantasRevenge says:

Wonderful puzzle and video. Easily equals if not surpasses your underpromotion videos. Iβm a beginner but can still appreciate how mind-blowing this puzzle is on some level.

22. @danutagalecka2497 says:

Stockfish 16 NNUE finds the checkmate in 12 instantly

23. @halophy2699 says:

How can I submit puzzle?

24. @user-tr2li3vu6u says:

People saying "owowo look at this puzzle stockfish can't solve" while using a browser version of it on a very low depth… Maybe next time use stockfish 16 with a proper GUI at depth 30

25. @tiagohello says:

Amazing puzzle! Thank you so much! π€

26. @alexmeanin8049 says:

Well done puzzle, great, amazing

27. @Astrobrant2 says:

This was truly amazing. You never fail to deliver.

28. @ffj57 says:

This is by far the most fascinating puzzle I have ever seen!

29. @Phixersor says:

Me, a 900 rated player, after hearing stockfish see no win, still pauses to have a look.

30. @astro_ash says:

31. @marluxia8832 says:

Somewhere, Lelouch vi Britannia smiled and thought: "That's my school! After all, if the king doesn't move, then his subjects won't follow".

32. @rubik8529 says:

Stockfish : 1 missed win
The missed win

33. @harikumars1487 says:

Thank you very Nelson for bringing this up!

34. @luutzennijdam7213 says:

The magical game of chess!!
Nobody will see this winning: not Carlsen, not Stockfish!! If you haven't seen it before…
Even the Stockfish algoritm could not predict the Bishop move to b2!!

35. @SagarVishwanath says:

What happens if black checks with f2 and take the bishop?

36. @codingvibes3537 says:

I am rated 1066

39. @aaronshebloski says:

7:19 isnβt qb6 just a fork?

40. @manharanverma8405 says:

41. @Blablablabla1ify says:

When you first move bishop to b2, whatβs stopping queen to f2 check, then take the bishop?

42. @w3g619 says:

9:55 What about Qf8? White king moves, but black queen can block the check with Qg7.

43. @dominikbednar4428 says:

5:04 crosscheckmate π

44. @user-uv1uf6pm8x says:

Bishop B2 is the only winning move because black can push the pawn and you can position the bishop between a1 and b2 without being attacked. If bishop goes to a1 you will get attacked by the pawn and black can deflect the bishop

45. @mauijttewaal says:

CrZy!

46. @thomasr2472 says:

When complaining about Stockfish, you need to understand: 1. It will find the solution if you increase the number of "lines" to 6 or more. In puzzles like this, more DEPTH does not help, it needs more BREADTH. If you limit the number of lines too much, it will cause too agressive dead branch elimination (i.e. it will quickly discard stupid looking moves). 2. Even with the default settings, if you show the solution to Stockfish, and then undo your move and analyze the same position as before, it will "remember" the correct move. 3. Stockfish vs. Stockfish lite doesn't matter. All engines use similar optimization techniques in order to come up with a result before the end of the universe. 4. No, this cannot be universally "fixed", because sometimes more breadth is better while other times more depth is better, and engines need to compromise because of limited resources.

47. @davidhein4725 says:

I thought of something, have no idea if this idea would work or not, @10:00 in the video, if it's blacks turn, why doesn't queen to f8 work? King would have to go to 5th rank, then maybe g7 for queen? I have no idea if that would work, I am no pro at chess by any means.

48. @farouqbaiti4315 says:

7:42 What if they play Qf8?
If we move our King on any legal move we lose because we can't go to e6.
If we could go to e6 he will play Qg7 we take it and they take back and we move to e7 and get a Queen.
Please don't get me wrong. Just understand and you will get it.

49. @TomBarrister says:

Stockfish also finds the move if you expand the search until Bc7 comes onto the analysis screen as one of the candidates.