White rook on or near the first rank in an endgame with active black passed pawns threatening promotion.

By Climbchess Research · 2026-05-08 · 3 min read · Updated May 8, 2026

SAE concept sae_5367 fires when white rook on or near the first rank in an endgame with active black passed pawns threatening promotion.. It appears in 3 of 9,950 Climbchess puzzles (0.0%), spanning ELO 970–2403 (median 2403).

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This page documents White rook on or near the first rank in an…, 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:

White rook on or near the first rank in an endgame with active black passed pawns threatening promotion.

This pattern fires in 3 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 970 to 2403, with a median rating of 2403. That distribution tells you whether this is a beginner cue or a master-level subtlety.

Pattern statistics

Related concepts

The five concepts most often co-firing alongside this one (Jaccard similarity over the puzzle co-occurrence graph) are:

• [polysemantic — fires on multiple unrelated patterns; needs split] — similarity 0.023
• A black minor piece is under pressure from white pieces, often leading to a… — similarity 0.019
• Central piece activity enabling a discovered attack or fork, often involving a… — similarity 0.010
• King on rank 2 or 7 in a simplified endgame, often with passed pawns or mating… — similarity 0.006
• A white knight that is actively placed in a tactical position, often on an… — similarity 0.005

Example puzzles

Below are 3 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.

• Puzzle zzOHa_M — ELO 970, themes: advancedPawn, crushing, discoveredAttack, side to move: Black
• Puzzle t6ScQ — ELO 2403, themes: blindSwineMate, clearance, endgame, side to move: White
• Puzzle t6ScQ_F — ELO 2403, themes: blindSwineMate, clearance, endgame, 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).