Detects complex tactical positions where the side to move has undeveloped or passive pawns on their 2nd rank, often correlated with back-rank or piece-sacrifice motifs.
SAE concept sae_3247 fires when detects complex tactical positions where the side to move has undeveloped or passive pawns on their 2nd rank, often correlated with back-rank or piece-sacrifice motifs.. It appears in 174 of 9,950 Climbchess puzzles (1.7%), spanning ELO 701–2672 (median 1623).
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This page documents Detects complex tactical positions where the…, 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:
Detects complex tactical positions where the side to move has undeveloped or passive pawns on their 2nd rank, often correlated with back-rank or piece-sacrifice motifs.
This pattern fires in 174 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 701 to 2672, with a median rating of 1623. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_3247 |
|---|---|
| Puzzles where it fires | 174 |
| Min ELO | 701 |
| Median ELO | 1623 |
| Max ELO | 2672 |
| Coverage | 1.75% 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 zyhJH — ELO 701, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zecKc — ELO 869, themes: advancedPawn, attraction, mate, side to move: White
- Puzzle zyn41 — ELO 1047, themes: endgame, master, mate, side to move: White
- Puzzle zp3eC_M — ELO 1236, themes: crushing, fork, hangingPiece, side to move: Black
- Puzzle zbNVh — ELO 1467, themes: clearance, crushing, discoveredAttack, side to move: White
- Puzzle 01wIv_F — ELO 1623, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zWw0h_F — ELO 1841, themes: master, mate, mateIn1, side to move: White
- Puzzle wCxNy — ELO 2175, themes: discoveredAttack, discoveredCheck, endgame, side to move: Black
- Puzzle yvAHc_M — ELO 2283, themes: crushing, fork, interference, side to move: White
- Puzzle iRTfm — ELO 2462, themes: crushing, endgame, veryLong, 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_3247?
Detects complex tactical positions where the side to move has undeveloped or passive pawns on their 2nd rank, often correlated with back-rank or piece-sacrifice motifs. 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 174 tagged puzzles (1.7% of the set), spanning Lichess ELO 701 to 2672 with a median of 1623.
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.