Heavy pieces (queen or rook) exerting pressure on the opponent's back rank or second rank.
SAE concept sae_16842 fires when heavy pieces (queen or rook) exerting pressure on the opponent's back rank or second rank.. It appears in 9 of 9,950 Climbchess puzzles (0.1%), spanning ELO 1308–2651 (median 2048).
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This page documents Heavy pieces (queen or rook) exerting pressure…, 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:
Heavy pieces (queen or rook) exerting pressure on the opponent's back rank or second rank.
This pattern fires in 9 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1308 to 2651, with a median rating of 2048. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_16842 |
|---|---|
| Puzzles where it fires | 9 |
| Min ELO | 1308 |
| Median ELO | 2048 |
| Max ELO | 2651 |
| Coverage | 0.09% 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 9 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle 01yBL_M — ELO 1308, themes: advantage, endgame, long, side to move: Black
- Puzzle z80J6 — ELO 1346, themes: crushing, endgame, interference, side to move: White
- Puzzle z80J6_F — ELO 1346, themes: crushing, endgame, interference, side to move: Black
- Puzzle z80J6_M — ELO 1346, themes: crushing, endgame, interference, side to move: White
- Puzzle zu33N — ELO 2048, themes: clearance, kingsideAttack, mate, side to move: Black
- Puzzle zu33N_F — ELO 2048, themes: clearance, kingsideAttack, mate, side to move: White
- Puzzle zc80c_M — ELO 2185, themes: endgame, mate, mateIn1, side to move: Black
- Puzzle wJnwT_M — ELO 2464, themes: deflection, mate, mateIn2, side to move: White
- Puzzle HdVFA_M — ELO 2651, themes: endgame, hookMate, mate, side to move: Black
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_16842?
Heavy pieces (queen or rook) exerting pressure on the opponent's back rank or second rank. 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 9 tagged puzzles (0.1% of the set), spanning Lichess ELO 1308 to 2651 with a median of 2048.
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.