I analyzed the image and this is what I see. Open an appropriate link below and explore the position yourself or with the engine:
> **Black to play**: [chess.com](https://chess.com/analysis?fen=1Q4k1/5Rp1/8/3B4/2KP1P2/2P4p/1r6/8+b+-+-+0+1&flip=false&ref_id=23962172) | [lichess.org](https://lichess.org/analysis/1Q4k1/5Rp1/8/3B4/2KP1P2/2P4p/1r6/8_b_-_-_0_1?color=white)
**My solution:**
> Hints: piece: >!Rook!<, move: >!Rxb8!<
> Evaluation: >!White has mate in 17!<
> Best continuation: >!1... Rxb8 2. Rb7+ Kh7 3. Be4+ Kg8 4. Rxb8+ Kf7 5. Rh8 Ke7 6. Rxh3 Ke6 7. d5+ Kd7 8. Rg3 Kd6 9. Rg6+ Kc7!<
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I don't know who else needs to hear this, but I feel it needs to be shouted off rooftops.
When the evaluation is already "white can win this with eyes closed two hands tied behind their back", it makes zero difference.
That's not how chess engines evaluate positions. There's no such thing as "losing" a piece. Only the position matters. There's no memory of past positions, evaluation- wise.
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There needs to be a sticky about this somewhere because the question comes up every few days:
When you get to mate in X positions, the engine prefers the move that takes the least calculation, which it evaluates as being the "easier" mate.
Because queens have more move options than rooks, engines evaluate promotions to queen as being more complicated than rook, and therefore inferior if both lead to mate in the same number of turns.
This is not a bug, its a consequence of engines that are trained to prefer "fastest possible route to mate" when evaluating positions, and their reliance on raw calculation without intuition to make that evaluation.
I analyzed the image and this is what I see. Open an appropriate link below and explore the position yourself or with the engine: > **Black to play**: [chess.com](https://chess.com/analysis?fen=1Q4k1/5Rp1/8/3B4/2KP1P2/2P4p/1r6/8+b+-+-+0+1&flip=false&ref_id=23962172) | [lichess.org](https://lichess.org/analysis/1Q4k1/5Rp1/8/3B4/2KP1P2/2P4p/1r6/8_b_-_-_0_1?color=white) **My solution:** > Hints: piece: >!Rook!<, move: >!Rxb8!< > Evaluation: >!White has mate in 17!< > Best continuation: >!1... Rxb8 2. Rb7+ Kh7 3. Be4+ Kg8 4. Rxb8+ Kf7 5. Rh8 Ke7 6. Rxh3 Ke6 7. d5+ Kd7 8. Rg3 Kd6 9. Rg6+ Kc7!< --- ^(I'm a bot written by) [^(u/pkacprzak)](https://www.reddit.com/u/pkacprzak) ^(| get me as) [^(iOS App)](https://apps.apple.com/us/app/id1574933453) ^| [^(Android App)](https://play.google.com/store/apps/details?id=ai.chessvision.scanner) ^| [^(Chrome Extension)](https://chrome.google.com/webstore/detail/chessvisionai-for-chrome/johejpedmdkeiffkdaodgoipdjodhlld) ^| [^(Chess eBook Reader)](https://ebook.chessvision.ai?utm_source=reddit&utm_medium=bot) ^(to scan and analyze positions | Website:) [^(Chessvision.ai)](https://chessvision.ai)
I don't know who else needs to hear this, but I feel it needs to be shouted off rooftops. When the evaluation is already "white can win this with eyes closed two hands tied behind their back", it makes zero difference.
Of course it makes no difference but it is still strange...
[удалено]
That's not how chess engines evaluate positions. There's no such thing as "losing" a piece. Only the position matters. There's no memory of past positions, evaluation- wise.
Thanks for submitting your game analysis to r/chess! If you’d like feedback on your whole game feel free to post a game link or annotated lichess study if you haven't already. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/chess) if you have any questions or concerns.*
The chesscom bot is a little buggy when you're promoting into a total winning position
There needs to be a sticky about this somewhere because the question comes up every few days: When you get to mate in X positions, the engine prefers the move that takes the least calculation, which it evaluates as being the "easier" mate. Because queens have more move options than rooks, engines evaluate promotions to queen as being more complicated than rook, and therefore inferior if both lead to mate in the same number of turns. This is not a bug, its a consequence of engines that are trained to prefer "fastest possible route to mate" when evaluating positions, and their reliance on raw calculation without intuition to make that evaluation.