Endgame positions where the side to move has a decisive tactical resource, often involving a piece sacrifice or back-rank threat.
SAE concept sae_1287 fires when endgame positions where the side to move has a decisive tactical resource, often involving a piece sacrifice or back-rank threat.. It appears in 22 of 9,950 Climbchess puzzles (0.2%), spanning ELO 632–2540 (median 1115).
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This page documents Endgame positions where the side to move has a…, one of 4,505 interpretable chess concepts extracted from Leela Chess Zero via sparse autoencoders. The full feature description from our SAE labelling pipeline reads:
Endgame positions where the side to move has a decisive tactical resource, often involving a piece sacrifice or back-rank threat.
This pattern fires in 22 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 632 to 2540, with a median rating of 1115. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_1287 |
|---|---|
| Puzzles where it fires | 22 |
| Min ELO | 632 |
| Median ELO | 1115 |
| Max ELO | 2540 |
| Coverage | 0.22% of puzzle set |
Related concepts
The five concepts most often co-firing alongside this one (Jaccard similarity over the puzzle co-occurrence graph) are:
Example puzzles
Below are 10 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle 00uEf_M — ELO 632, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle xR1pO — ELO 799, themes: anastasiaMate, endgame, master, side to move: Black
- Puzzle zwocD_M — ELO 826, themes: advantage, endgame, fork, side to move: Black
- Puzzle sZhLw_M — ELO 879, themes: crushing, endgame, long, side to move: Black
- Puzzle zwpkm_M — ELO 969, themes: backRankMate, endgame, long, side to move: Black
- Puzzle zxbB4_F — ELO 1115, themes: attraction, kingsideAttack, master, side to move: Black
- Puzzle zqQ5W_M — ELO 1184, themes: crushing, endgame, fork, side to move: Black
- Puzzle ouTwU_F — ELO 1376, themes: arabianMate, endgame, master, side to move: White
- Puzzle zuzQM_M — ELO 1644, themes: advantage, discoveredAttack, endgame, side to move: White
- Puzzle 7eBEC_M — ELO 2007, themes: endgame, long, mate, side to move: White
How to use this page
If you want to train this pattern, open the Climbchess trainer and filter for puzzles tagged with this concept. The trainer surfaces them at the right difficulty for your current rating, and tracks how often you spot the cue versus miss it. You can also browse the related concepts above to see neighbouring ideas in feature space.
Climbchess concepts are not heuristics written by a human author. Each one corresponds to a single direction in the residual stream of Leela Chess Zero that activates on a specific board feature, then was labelled by reading the top-activating positions. This makes the catalogue exhaustive (every Leela-detectable pattern is in here somewhere) and falsifiable (you can replay our extraction).
Frequently asked
What is SAE concept sae_1287?
Endgame positions where the side to move has a decisive tactical resource, often involving a piece sacrifice or back-rank threat. It is one of 4,505 interpretable features extracted from Leela Chess Zero's residual stream via sparse autoencoders, then labelled by reading the top-activating positions.
Where does this pattern appear?
In 22 tagged puzzles (0.2% of the set), spanning Lichess ELO 632 to 2540 with a median of 1115.
How do I train it?
Open the Climbchess trainer and filter for puzzles tagged with this concept. The trainer adapts difficulty using your live recognition profile and tracks how often you spot the cue versus miss it.
Is it free?
Yes. Climbchess is free forever, with no account, email, or signup required. You can delete your data at any time.