Black bishop actively placed on an open diagonal in a middlegame position where tactical threats (fork, pin, or mating attack) are imminent.
SAE concept sae_19396 fires when black bishop actively placed on an open diagonal in a middlegame position where tactical threats (fork, pin, or mating attack) are imminent.. It appears in 58 of 9,950 Climbchess puzzles (0.6%), spanning ELO 811–2591 (median 1940).
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This page documents Black bishop actively placed on an open diagonal…, 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 actively placed on an open diagonal in a middlegame position where tactical threats (fork, pin, or mating attack) are imminent.
This pattern fires in 58 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 811 to 2591, with a median rating of 1940. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_19396 |
|---|---|
| Puzzles where it fires | 58 |
| Min ELO | 811 |
| Median ELO | 1940 |
| Max ELO | 2591 |
| Coverage | 0.58% 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 zubmO — ELO 811, themes: advantage, fork, middlegame, side to move: Black
- Puzzle zvCPh_M — ELO 972, themes: mate, mateIn2, middlegame, side to move: White
- Puzzle 023qj — ELO 1365, themes: epauletteMate, master, mate, side to move: Black
- Puzzle zLdRI — ELO 1489, themes: advantage, attraction, middlegame, side to move: White
- Puzzle zyuyc_M — ELO 1590, themes: hangingPiece, kingsideAttack, mate, side to move: Black
- Puzzle zlk6H_M — ELO 1940, themes: attraction, backRankMate, mate, side to move: Black
- Puzzle zu7pM_F — ELO 2003, themes: advancedPawn, crushing, deflection, side to move: White
- Puzzle ZAN8y_M — ELO 2106, themes: doubleBishopMate, mate, mateIn4, side to move: Black
- Puzzle TZvyG_M — ELO 2174, themes: backRankMate, long, mate, side to move: Black
- Puzzle KBeL6_M — ELO 2350, themes: backRankMate, mate, mateIn4, 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_19396?
Black bishop actively placed on an open diagonal in a middlegame position where tactical threats (fork, pin, or mating attack) are imminent. 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 58 tagged puzzles (0.6% of the set), spanning Lichess ELO 811 to 2591 with a median of 1940.
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.