A black knight on or near the back rank, sidelined and inactive during a tactical sequence.
SAE concept sae_2061 fires when a black knight on or near the back rank, sidelined and inactive during a tactical sequence.. It appears in 17 of 9,950 Climbchess puzzles (0.2%), spanning ELO 950–2483 (median 1812).
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This page documents A black knight on or near the back rank…, 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 black knight on or near the back rank, sidelined and inactive during a tactical sequence.
This pattern fires in 17 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 950 to 2483, with a median rating of 1812. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2061 |
|---|---|
| Puzzles where it fires | 17 |
| Min ELO | 950 |
| Median ELO | 1812 |
| Max ELO | 2483 |
| Coverage | 0.17% 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 00WAp_M — ELO 950, themes: mate, mateIn1, middlegame, side to move: White
- Puzzle z7M6E — ELO 1089, themes: crushing, middlegame, queensideAttack, side to move: White
- Puzzle z7M6E_M — ELO 1089, themes: crushing, middlegame, queensideAttack, side to move: White
- Puzzle 021Un — ELO 1653, themes: advantage, fork, intermezzo, side to move: Black
- Puzzle 021Un_F — ELO 1653, themes: advantage, fork, intermezzo, side to move: White
- Puzzle zzpAZ_F — ELO 1812, themes: mate, mateIn1, middlegame, side to move: White
- Puzzle sDPAo_M — ELO 1840, themes: mate, mateIn4, middlegame, side to move: Black
- Puzzle ocWAQ — ELO 2138, themes: hangingPiece, kingsideAttack, mate, side to move: Black
- Puzzle h1wG5 — ELO 2458, themes: cornerMate, mate, mateIn2, side to move: Black
- Puzzle h1wG5_M — ELO 2458, themes: cornerMate, mate, mateIn2, side to move: Black
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_2061?
A black knight on or near the back rank, sidelined and inactive during a tactical sequence. 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 17 tagged puzzles (0.2% of the set), spanning Lichess ELO 950 to 2483 with a median of 1812.
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.