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# Hardest chess problem. Stockfish 12 can’t solve it.

Cool! Lol if stockfish can't solve it, I wouldn't know where to start lol.

stockfish can solve it... in less than 30 seconds. see post #4. and in less than 2 minutes in multi-PV mode. see post #6

Yes because you download it with solution. Can you give this one to your stockfish and see if it solves it?

nope, i just set my engine up correctly...

Excellent. And for post #11, I couldn't figure it out but I see it's possible based on the orientation of the board being opposite of what is assumed in white starting from the bottom.

yes, i can solve it myself to

I analysed it, if Black instead took the bishop its a draw

Imagine using a computer to solve a chess puzzle, and then bragging about how fast "you" did it

Well technically he did 'see' the solutions. :-P

Hello, I attach the following problem that Stockfish 12 couldn’t solve while running for 20 mins on my PC and reaching depth 34.

All chess engines are content with 1.Qd6+ Kg8 2.gxh7+ Kh8 3.Bxa5, which hardly yields more than a draw. There is, however, a very clear and forced win with a dramatic second move that is thrilling to see. 1.Qc8! Kg8 2.Bc7!! This is the star move. Why it's hard for a computer to find 2.Bc7!! is because White has for at least 16 ply only a pawn and a bishop against black's queen, knight and two pawns. But Black is in zugzwang! 2...Qxc8 [2...Nxc7 3.gxf7+] 3.gxf7+ Kh8 [3...Kf8 4.Bd6#] 4.Be5. White is threatening to move his king and discover check and mate. 4...Qc5 5.Bb2 Nc7. Black has the white king contained, but cannot afford to move either the queen or the knight for fear of mate. 6.Ba1 a4 7.Bb2 a3 8.Ba1 a2 9.Bb2 a1Q 10.Bxa1 and now Black is in deadly zugzwang - he must move either the queen or the knight. 10...Nd5+ 11.Ke6+ Nc3 12.Bxc3+ Qxc3 13.f8Q# 1-0.

WOW Thats god level.

yes, i can solve it myself to

I analysed it, if Black instead took the bishop its a draw

it was white to move

yes, i can solve it myself to

I analysed it, if Black instead took the bishop its a draw

it was white to move

No, instead of Kb1, he could've taken the bishop on a1

then mate

hmm your right, seems stockfish cant solve this!

In 3-line PV mode, the latest SF dev build will randomly solve it at different time intervals on my Ryzen 7 2700X. I had one iteration take 3 minutes to solve it, and clearing memory, another iteration solved it in 5 seconds flat.

yes, i can solve it myself to