A challenging chess problem for strong players! 

That is the most convoluted position I've seen you post.

How consoling that the best computer software in the World is not a match for a mere human

Excellent study... lot of learnings... Thank you very much

There's an important line that you missed here, if black plays 2... Kh1 then we play a waiting move with the bishop, e.g. 3. Ba6. We allow the promotion, and mate immediately with 4. Bb7 and 5. Bxg2# unless black underpromotes to a Knight. In that case we play 4. Kg3. Now in response to either 4. Nxe2+ or 4. Nf3 we play Kf2 and the finish is similar to the version you showed. And if 4... Nh3 then 5. Bb2#

The former world champion Smyslov made such interesting studies.

Great puzzle!

I am on a roll today, solving all 4 of your puzzles that I tried, but this was by far the hardest and I didn't really play out the Underpromotion variations at the end until we go to that part. I was torn between C4 and D5 for like an hour, so I would have timed out. I was trying to use C4 for a checkmate and I finally realized how good it was to have the e2 space protected by the Bishop.

I don't think that Magnus Carlson could have solved this.

This problem is a really hard one! Many options don’t work.

I did find the first move the second one was a nice surprise, so was the final endgame with Bishop against knight.

Excellent!!

After noticing the time length of this study [12.38], I realized that there was NO WAY that I was going to attempt to solve it. Why beat my head against the wall by making thousands of random, errant moves? So, I just sat back and enjoyed the video … I was duly rewarded for my discretion!

Very difficult, a true World Champion's study!

I put this into Stockfish and it was only after Kf2 that it dawned on it that this was lost from the beginning. Crazy how it can't see a mate in 7 - usually it spots crazy stuff like mate in 17

1:22 Losing in the meaning of we failed to win and just got a draw? :)

Wow!

Found it! 😊 At least the main moves, didn't check every variant!

I realized pretty quickly that anything other than Nc3 couldn't be winning but I wasn't able to see the win after ...c2 and would likely have thrown the game away with Ne2. Edit: I doubt I would have *ever* found Kf2 in response to ...Ne2.

the missed win stockfish was talking about:

This is rich! I stumbled every step!

(@5:50) Instead of Bc6, you have Bh1! forcing black into zugzwang! Black must play Kf2, then white just grabs the pawn with Kxh2. Now a bishop and knight can force a checkmate.

I saw the first move, and then I floundered.😂

At 11:28 it is said that white has checkmate by moving bishop to e4 but what stops black knight from taking the bishop (and putting white in check)?

hint for author: besides inaccuracies, you missed several interesting variants, which make this study more interesting. i recommend redo this video. 1.Nc3 Kg1 ( 1...g2 2.Bc4 Kg1 ( 2...g1=N+ 3.Kg3 Ne2+ 4.Kf2 Nxc3 5.Kf1 Ne4 6.Bd3 Ng3+ ( 6...Nf2 7.Be2 ) ( 6...Ng5 7.Be2 ) ( 6...Nf6 7.Be2 ) ( 6...Nc5 7.Be2 ) ( 6...Nc3 7.Bc2 ) ( 6...Nd2+ 7.Kf2 Nf3 8.Ba6 ) 7.Kf2 Ne4+ 8.Bxe4# ) 3.Ne2+ Kf2 ( 3...Kh1 4.Ba6 g1=N+ 5.Kg3 Nxe2+ 6.Kf2 Nd4 7.Bb7+ ) 4.Kxh2 ) 2.Ne2+ Kh1 ( 2...Kf1 3.Nxg3+ Kg1 4.Bd5 ) ( 2...Kf2 3.Nxg3 Kg1 4.Bd5 ) 3.Bd5+ g2 4.Bxg2# *

!!

Li chess StockFish say Nc3 +99.0

I got it under the minute, but would have never search for a win overboard - would have just taken the draw. Looking now - no, I did not see all the lines :), amazing