A king on the back rank or near-corner square that is attacked by at least one enemy piece with no friendly defenders.
SAE concept sae_13281 fires when a king on the back rank or near-corner square that is attacked by at least one enemy piece with no friendly defenders.. It appears in 42 of 9,950 Climbchess puzzles (0.4%), spanning ELO 817–2352 (median 1508).
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This page documents A king on the back rank or near-corner square…, 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 king on the back rank or near-corner square that is attacked by at least one enemy piece with no friendly defenders.
This pattern fires in 42 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 817 to 2352, with a median rating of 1508. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_13281 |
|---|---|
| Puzzles where it fires | 42 |
| Min ELO | 817 |
| Median ELO | 1508 |
| Max ELO | 2352 |
| Coverage | 0.42% 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 vaMud_M — ELO 817, themes: advantage, endgame, fork, side to move: White
- Puzzle zLhD5_M — ELO 1190, themes: crushing, middlegame, short, side to move: White
- Puzzle zxmDb_M — ELO 1332, themes: crushing, endgame, fork, side to move: White
- Puzzle zlvQB_M — ELO 1452, themes: crushing, middlegame, short, side to move: White
- Puzzle 01m2g_M — ELO 1494, themes: crushing, endgame, short, side to move: White
- Puzzle zmkT8_F — ELO 1508, themes: deflection, discoveredAttack, long, side to move: White
- Puzzle zoKuI_M — ELO 1785, themes: crushing, hangingPiece, middlegame, side to move: White
- Puzzle z6S3O — ELO 1982, themes: crushing, middlegame, short, side to move: White
- Puzzle zt9tn — ELO 2164, themes: advantage, long, middlegame, side to move: White
- Puzzle zzs1o_F — ELO 2177, themes: attraction, crushing, fork, 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_13281?
A king on the back rank or near-corner square that is attacked by at least one enemy piece with no friendly defenders. 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 42 tagged puzzles (0.4% of the set), spanning Lichess ELO 817 to 2352 with a median of 1508.
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.