I Tricked Stockfish

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4k2K/5R1R/8/8/8/2pp4/1p2b3/1qb5 w - - 0 1
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[@lahu76]

For anyone wondering why "your" engine found mate in 16 and in video it did not for a while. As Nelson explained - the default setting is depth 22. Now "depth22" means 22 half-moves (so it counts moves for both white and black) which means it can only look 11 moves ahead. Since the solution is Mate in 16, that is 32 half-moves, and is beyond the scope the engine is allowed to look at.

[@aleksihiltunen7063]

Dont know about stockfish but some engines do exceed their depth limit by going deeper on forcing and good looking lines. That could be why the full version of the engine may still spot the mate even though it shoukd be out of reach

[@Xyvir]

Depth a discreet number of moves but has to do more with the way the engine calculates lines

[@lahu76]

I really don't know what your point here is. The stockfish as is is open-soource chess engine, so it is free in "full" version as much as it is possible. You can download and complie the latest code versions. Not sure about the point of engines ignoring the settings its as if saying I explicitly forbbit the AI of painting the background green, but it painted it green enyway so because it was full version of paint thinsg green and ignore the settings. Like what is the actual point here? @@aleksihiltunen7063

[@iGeen7]

In this case the mate in 16 is found at depth 34 only. While some mates for black (for Rc7 first move, e.g.), say mate in 33 was found at depth 30 (and refined to mate in 18 at depth 40)....

[@sevret313]

No, that's not an excuse, you don't get to clickbait that he tricked stockfish when he runs stockfish at terrible settings. Using it with default settings on Lichess it finds it straight away.

[@lethalty6055]

13:20 For anyone wondering why you don't take the bishop is because of Qh1+, forcing white king to go on the g-file, and then black gets another queen.

[@johntobin7597]

Nelson, I'd love to see a "making of" video where we get YOUR perspective as you solve a puzzle. For example, the way you highlight the path of a given piece (or draw a triangle). Are you able to activate all of the arrows/lines in real-time? If so, I'd like to witness that from your side of the screen.

[@ethanma4422]

Average stockfish moment be like: Stockfish: "Mate in 29" Also Stockfish: Depth 22

[@Mateilenberg]

Man, that black king must be exhausted!

[@sgwa11]

If this situation ever happened to me in real life I would never remember this sequence to win

[@megauser8512]

I know right?!? Me neither!

[@patrickbullock1245]

Nelson at 7:41 when the Bishop pins the Rook you don't lose your Rook as Ra8 gives check forcing Bb8. You follow with Rg8 forcing King to 7th rank and Rb8 captures Bishop. I know the game goes much longer as the King has escaped. I was just pointing out the error of your statement.

[@Mmmeeee4]

after the Rook takes the Bishop on b8, it also prevents the pawn on b2 to promote.

[@hellydpsin]

​@Mmmeeee4 I can't see why not take the Queen and checkmate with the same rook

[@sieu-deletion]

Problem: when white takes the bishop, black will play d2 and threaten to promote the queen, and how can you stop it ?

[@Alan-xxxxxx]

​@@hellydpsinThe bishop on F8 can block

[@patrickbullock1245]

​@@Mmmeeee4 Greetings. I agree but black can start pushing pawn to d2

[@RootBoyJim]

You are in a Maze of Twisty Little Passages, All the Same.

[@robertkingsley5485]

Hey Nelson, Greetings from England, Happy Christmas. Hope your health is better or improving. Appreciate your videos and enthusiasm. 🙂

[@morrisleehaoyang2]

2:21 and wow my kid is screaming in the background😂

[@kuei4604]

Stockfish immediately displays M16 after setting the maximum depth to 99 for me . Still a fun and excellent puzzle~ , 👍

[@tontonbeber4555]

I'm still investigating this ... I agree stockfish immediately finds M16 in a few second for depths above 40, but only if it set to single line analysis. Nelson uses a platform whose default setting is analysis of 3 different lines simultaneously. And even with setting to 2 lines, it doesn't work ... so there is probably a bug in the way stockfish manages multi line evaluation.

[@iGeen7]

​@@tontonbeber4555I found solution with 5 lines... but in 25 minutes 😂

[@Sixsoul]

Hope you had a great Christmas Nelson!

[@reubenmanzo2054]

What about Kg7? What's stopping Rh8#? Also, at 10:55, why can't black play Ke8?

[@aaronscott7467]

I had the same thought, but I believe the reason it doesn't is because Bh6 buys black enough turns with Qg or h1 following up depending on your move.

[@mncdssctn9110]

Bishop h6, and then you’re losing. Can’t allow black to start putting you in check.

[@farouqbaiti4315]

Every move it glitches but finally it returns to normal and says that White is winning.

[@TheEthikos]

What in the...that is bonkers.

[@iguana5736]

3 sets of 3 adverts each. 9 unskippable adverts in one short video.

[@JB-my4pp]

In a game I would never even think about checkmating in this position. I would just play the perpetual check lmao. Even with the explanation I don't fully get it

[@Dr_Delirium]

5:17 I’m unsure why the black king can’t just walk back over to D8

[@MrBrain4]

I have the exact same question.

[@rybasov]

Merry Christmas and Happy New Year!!!

[@pranav_royality]

11:6 why he is forced to go to c8 not e8 and thats the move where stockfish change

[@GlobalWarmingSkeptic]

"I have a queen, two bishops and 3 pawns ready to promote. What do you have?" "LMAO I got 2 rooks on the 7th rank. GG nerd"

[@alex_zetsu]

Stockfish will actually fail by time on 15 minutes plus increment time control if you let it go too deep as long as you play semi-descent moves. it doesn't matter if you are -3.7, as long as your pieces can theoretically checkmate the other guy if they run out of time you win. On default settings stockfish will not run out of time on any reasonable time control and it not just beat an NM, it will beat the chess champion.

[@berndmayer3984]

You must take the option "Multivariationpath = 1" then SF finds a mate in 16 moves in a few seconds. 0.00 meanes : SF sees no progress in further evaluation and stops this path

[@Robi2009]

2:25 - how about Bf3? It covers the a8 mating square

[@aididdat1749]

The funny part is who in the world would be that irresponsible to leave the black king alone with to rocks and another king?

[@strange9863]

telling every unneccassarry move but not the important ones

[@gernotg8480]

No more rating climb?

[@abbas_oso]

we are hungry for a new rating climp series

[@lajos-berenyi]

Conclusion: you randomly give check with the rooks on the seventh rank, until you finally give checkmate! 🙂 But seriously, nice puzzle!

[@igorxyz8682]

7:21 Ta8 and takes a bishop!!

[@MrBrain4]

How does one even come up with such a puzzle? Mind-boggling!

[@stellar-gp6oq]

at 7:40, after f4 bishop went e5, can't we just move a7 rook a8 to ? isnt that checkmate already?

[@ВикторПоплевко-е2т]

My engine saw it's winning for white on the spot and when I played the first half-move it saw mate in 16 on the spot

[@Qwentar]

Question: why do you talk about black positioning the bishops to block the rooks instead of taking the rooks? ex. at 2:22 light bishop to f3, covers a8. If white follows with rg7, then bd5 covers both possible attacks by white. Why not start with Kg7? King guards the rook on f7, threatens rh8, checkmate. I guess... black would follow up with bh6 check, white takes with rook, still threatens with rh8 checkmate and black has no more moves to check white in one move. Oh wait: qg1. Never mind.

[@gavinlol-lo1pd]

10:45 You didn’t explain why the rook can’t go to a7??? After Ra7 Ke8 there are many choices: If Rg7 then Qa2 defends both If Rfb7 then Bg5 If Kg8 then Qa2 pins the rook to the king If Kg7 then Bh6+

[@vivaankohli9448]

Merry Christmas to you and your family!

[@alexp4932]

My cell phone says its m16 immediately

[@wertigon]

@7:38 but wait, even if rook is pinned isn`t Ra8 checkmate? King cannot move and it is allowed to unpin a piece if it leads to victory right?

[@mncdssctn9110]

Ra8 is not checkmate, because Bb8

[@AlexT-o1k]

When you didn’t see any moves💀 14:54

[@TottenvilleMiddleSchool]

These chess puzzles are fascinating!! 😄

[@jonathancauley5345]

Dang what a crazy win for white where unexpectedly, stockfish disbelieves in a win for white. However, white is able to win in under 20 moves!

[@cfslim4768]

7:40 the rook is not being won ra8 bishop is forced back to block black still wins but not how you made it seem

[@kenabartholomew5777]

This is a great end game lesson.

[@godwincornelius201]

5:15 what about KD8

[@SparkyForce]

Hope your Christmas was great!

[@billdarling7886]

7:39 rook to A8 is still checkmate though

[@kangjohan78]

Bb8

[@billdarling7886]

​@mythbusters866missed that. You're right

[@bayern1806]

Arent there at least 3 repetitions at some point?

[@ic6406]

I don't think that the stockfish can be "confused" because basically what it does just trying every move possible and evaluates the position. It can try a lot of moves until some depth. I bet that you wouldn't be able to win this position against stockfish because it would find moves like sliding king over back and forth at the beginning. It just won't go to the A corner and you can't force it to do that with just two rooks on the same rank

[@EnverHalilHoxha1917]

Watch the vid.

[@ThainaYu]

I feel like chess engine think it was a draw because you just force only their king to move in the same place, and it might count as repetition?

[@vicehill9181]

If there was a forced repetition available, he would have ran into it in the solve. There is no forced repetition if played correctly like he showed.

[@williamsquires3070]

(@12:24) - why can’t black just a draw by 3-move repetition with 1 … Kc8 again after 1 Rh7. ?

[@jitendradighe8149]

What if white plays g7 . Next move is met

[@FollowerOfTheChrist1]

Love you Nelson!!

[@alimollahosseini7838]

Merry Christmas chess vibes

[@nelsonlopez1228]

Is bishop G5 not an option at 9:00?

[@sieu-deletion]

Because of Ra1#

[@ivyyan]

my one is torch 50mb downloaded and it says M16 for black

[@complimentpeople]

This video does not show the chess board

[@KraggHC]

Move your mic slightly to the side, so you don't breath directly into it. This will solve your plosives.

[@gary100268]

Total novice here, so if this question sounds dumb I apologize in advance. Why not move king to g7 then rook to h8

[@mncdssctn9110]

If you put king on g7, black can put you in check with bishop to h6. Sure, you can take it but it’s still a winning endgame for black. The key is to not allow black to put you in check, not even once, because then you’re losing.

[@jaredmaciej7315]

Kb8!? Why sac the q

[@Random_user274]

I got all the moves wrong (Except for the first 7 moves and the last move) Because I was always one square off. Ex I played Rook A7 and got it wrong because of Queen A2. (I’m 2000 rated in Puzzles)

[@IlliaKulikov]

11:05 why not rook a7?

[@wiscorpio72]

I wonder if AI made Stockfish smarter? I made white's 1st move and it found the mate in 15.

[@bugoobiga]

5:50 :D

[@Trelmayas21]

Always interesting to see the gaps in Stockfish's analysis like this.

[@cal2224]

Annoying puzzle

[@prplt]

"birth of Jesus" 😬

[@farouqbaiti4315]

How long was that! I think I am gonna analyze it since I solved it correctly.

[@giowiokio]

i got a 7000 dollar pc to play chess 😎😎

[@keshabthapa6703]

Why Kg7 does not work?

[@mncdssctn9110]

Bh6 check. Even if you capture with rook or king, black queen comes into play and black is winning.

[@kapilnithin6979]

Nelson please put a video on chess advencher

[@slyveonnumeros]

It's a draw by repetition is what is sees

[@mrblablablabla]

What if you start with Kg7?

[@mncdssctn9110]

Black plays bishop h6 check, and no matter what you do, if you retreat or if you capture, you’re done for, because blacks queen now have all sorts of options. Allowing blacks pieces to put you in check (even if you can capture some of them) is a sure loss.

[@jemakhan]

Why not K to G7 first?

[@mncdssctn9110]

Black bishop h6 check, and then it’s suddenly a winning endgame for black, since the queen comes into play and then frees up space for the b2-pawn to promote. The key with the puzzle is to not give black any opportunity to put you in check.

[@stanimir5F]

Amazing one! :)

[@mikeherbert1343]

Very clever

[@thomasyogayoiii3759]

Royyyy

[@jaideepshekhar4621]

This is actually your first video I had to remove the like on click, because I couldn't understand your solution. Maybe rerecording was the better option.

[@Mal1234567]

AI chess bots analyze every part of the game differently. The endgame is analyzed differently from the mid game and opening. It looks from the analysis lines that it’s doing the same thing all the time, but there are things going on in the analysis that we can’t see.

[@sirsupersaif6641]

Jesus was not born on Christmas bro where does it say in the bible

[@nanowasabi4421]

Right. We just celebrate his birth today. Merry Christmas!

[@sergeimashkov2022]

We don't celebbrate Christmas in Russia on this day, but congrads to all who do all the same!

[@gamer56589]

i hate this video cause the bishops can guard the checkmate squares by moving and says white wins 🤬😡🤬😡🤬😡☠☠💀☠

[@kiffygreene4598]

Hey chess vibes!!

[@AndersRosendalBJJ]

Hilarious 🙂

[@AmarSingh-ew3nc]

Jesus is king!

[@thejjnator01]

I love nelsi

[@fantomghost6213]

Nice

[@devarakondamuralikrishna804]

Waiting for your video just like Santa's Gift!!!!

[@DaDitka]

Not first.

[@gamergamingdarshss1103]

First

[@rayanbhami1698]

I’m here first!

[@GENGARVMAX]

First pin me

[@jadencoles380]

GOSPEL Are of us are evil and are going to hell If you have lied once, stolen a small thing, taken the lords name in vain, looked at someone sexually, you are worthy of going to hell! Here is the good news Jesus Christ paid the fine by dying on the cross so that all we have to do to get to heaven is confess plus turn away from our sins and to put all of our trust in Jesus Christ alone for your salvation!

[@leosouza1508]

So basically you analysed the position with stockfish MINIMUM depth, and claim it cant solve the position :) i know ur not dumb or new at chess, so yea, nice clickbait setup, very original xD checkmated me!!

[@aidenalexander7982]

1st

[@shaggysunshine7441]

Ok I can respect you are religious. But chess isn't. Can you keep them separate? It actually makes me want to turn off the video.

[@jacksonhorrocks4281]

Isn't this his content and not Chess's?

[@shaggysunshine7441]

@@jacksonhorrocks4281 Terry Mocky chute isn't this my comment not yours?

[@thefart]

Says mate in 16 on my screen

[@hossain8463]

Too much complicated!!! 🥲🥲🥲🥲 impossible finding 😪😪😪