Black bishop infiltrated to the 2nd rank (a2 or h2 area) as part of a double-bishop back-rank mating pattern.
SAE concept sae_9467 fires when black bishop infiltrated to the 2nd rank (a2 or h2 area) as part of a double-bishop back-rank mating pattern.. It appears in 17 of 9,950 Climbchess puzzles (0.2%), spanning ELO 782–2362 (median 907).
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This page documents Black bishop infiltrated to the 2nd rank (a2 or…, 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:
Black bishop infiltrated to the 2nd rank (a2 or h2 area) as part of a double-bishop back-rank mating pattern.
This pattern fires in 17 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 782 to 2362, with a median rating of 907. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_9467 |
|---|---|
| Puzzles where it fires | 17 |
| Min ELO | 782 |
| Median ELO | 907 |
| Max ELO | 2362 |
| 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 zh002 — ELO 782, themes: doubleBishopMate, mate, mateIn1, side to move: White
- Puzzle zh002_F — ELO 782, themes: doubleBishopMate, mate, mateIn1, side to move: Black
- Puzzle xaten — ELO 850, themes: doubleBishopMate, mate, mateIn1, side to move: White
- Puzzle xdqXV — ELO 877, themes: doubleBishopMate, mate, mateIn1, side to move: Black
- Puzzle xdqXV_F — ELO 877, themes: doubleBishopMate, mate, mateIn1, side to move: White
- Puzzle yjpKK — ELO 907, themes: doubleBishopMate, mate, mateIn1, side to move: White
- Puzzle yjpKK_M — ELO 907, themes: doubleBishopMate, mate, mateIn1, side to move: White
- Puzzle zzuPP — ELO 1220, themes: master, mate, mateIn2, side to move: Black
- Puzzle zzuPP_M — ELO 1220, themes: master, mate, mateIn2, side to move: Black
- Puzzle zzfbq_F — ELO 2362, themes: advantage, long, middlegame, 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_9467?
Black bishop infiltrated to the 2nd rank (a2 or h2 area) as part of a double-bishop back-rank mating pattern. 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 782 to 2362 with a median of 907.
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.