A knight is under tactical pressure, with pieces from both sides contesting the square or piece exchange.
SAE concept sae_5159 fires when a knight is under tactical pressure, with pieces from both sides contesting the square or piece exchange.. It appears in 87 of 9,950 Climbchess puzzles (0.9%), spanning ELO 798–2611 (median 1377).
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This page documents A knight is under tactical pressure, with pieces…, 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:
A knight is under tactical pressure, with pieces from both sides contesting the square or piece exchange.
This pattern fires in 87 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 798 to 2611, with a median rating of 1377. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_5159 |
|---|---|
| Puzzles where it fires | 87 |
| Min ELO | 798 |
| Median ELO | 1377 |
| Max ELO | 2611 |
| Coverage | 0.87% 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 yuxMM — ELO 798, themes: crushing, discoveredAttack, kingsideAttack, side to move: White
- Puzzle zSwW9 — ELO 884, themes: clearance, kingsideAttack, mate, side to move: White
- Puzzle zGvGz_M — ELO 998, themes: endgame, hookMate, master, side to move: White
- Puzzle 01mxD — ELO 1200, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle yNN6J — ELO 1233, themes: endgame, hookMate, mate, side to move: White
- Puzzle 022HT — ELO 1377, themes: advantage, discoveredAttack, middlegame, side to move: Black
- Puzzle zwLqv_F — ELO 1714, themes: crushing, discoveredAttack, discoveredCheck, side to move: Black
- Puzzle zsY4h — ELO 2092, themes: advantage, discoveredAttack, middlegame, side to move: Black
- Puzzle zzVo5 — ELO 2154, themes: advantage, long, middlegame, side to move: Black
- Puzzle zvS2x_F — ELO 2413, themes: advantage, clearance, intermezzo, 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_5159?
A knight is under tactical pressure, with pieces from both sides contesting the square or piece exchange. 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 87 tagged puzzles (0.9% of the set), spanning Lichess ELO 798 to 2611 with a median of 1377.
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.