A pawn (either colour) on the 2nd rank near the kingside, in a position involving mating threats or tactical pressure.
SAE concept sae_1495 fires when a pawn (either colour) on the 2nd rank near the kingside, in a position involving mating threats or tactical pressure.. It appears in 403 of 9,950 Climbchess puzzles (4.1%), spanning ELO 610–2683 (median 1633).
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This page documents A pawn (either colour) on the 2nd rank near 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:
A pawn (either colour) on the 2nd rank near the kingside, in a position involving mating threats or tactical pressure.
This pattern fires in 403 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 610 to 2683, with a median rating of 1633. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_1495 |
|---|---|
| Puzzles where it fires | 403 |
| Min ELO | 610 |
| Median ELO | 1633 |
| Max ELO | 2683 |
| Coverage | 4.05% 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 xRhy5_M — ELO 610, themes: advantage, endgame, master, side to move: Black
- Puzzle zKsiR_M — ELO 896, themes: endgame, mate, mateIn1, side to move: Black
- Puzzle yWfux — ELO 1037, themes: advantage, endgame, interference, side to move: White
- Puzzle zv0bv — ELO 1222, themes: endgame, mate, mateIn1, side to move: White
- Puzzle zsbHb_M — ELO 1496, themes: crushing, endgame, long, side to move: White
- Puzzle 01UyQ — ELO 1633, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle qmPYE_F — ELO 1811, themes: endgame, hookMate, mate, side to move: White
- Puzzle zcESo_F — ELO 2060, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zmeoN_M — ELO 2199, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle G6AMU — ELO 2410, themes: backRankMate, deflection, 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_1495?
A pawn (either colour) on the 2nd rank near the kingside, in a position involving mating threats or tactical pressure. 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 403 tagged puzzles (4.1% of the set), spanning Lichess ELO 610 to 2683 with a median of 1633.
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.