[polysemantic — fires on multiple unrelated patterns; needs split]

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

SAE concept sae_23228 fires when [polysemantic — fires on multiple unrelated patterns; needs split]. It appears in 14 of 9,950 Climbchess puzzles (0.1%), spanning ELO 1309–2344 (median 1970).

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This page documents [polysemantic — fires on multiple unrelated…, 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:

[polysemantic — fires on multiple unrelated patterns; needs split]

This pattern fires in 14 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1309 to 2344, with a median rating of 1970. 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:

• A knight (or pawn) that is the key attacking piece in a forced mate-in-one… — similarity 0.167
• A square where white holds a local attacking advantage — fork target, hanging… — similarity 0.150
• A square on the 3rd or 6th rank that is not attacked by the opponent, and is… — similarity 0.143
• White has a contested back-rank rook or a defended piece on the first rank… — similarity 0.103
• White king in a relatively safe position in a rook or mixed endgame, not under… — similarity 0.061

Example puzzles

Below are 10 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.

• Puzzle 022JP — ELO 1309, themes: endgame, master, mate, side to move: Black
• Puzzle 022JP_F — ELO 1309, themes: endgame, master, mate, side to move: White
• Puzzle 022JP_M — ELO 1309, themes: endgame, master, mate, side to move: Black
• Puzzle zomJR_F — ELO 1947, themes: advantage, endgame, interference, side to move: White
• Puzzle zomJR_M — ELO 1947, themes: advantage, endgame, interference, side to move: Black
• Puzzle zwwhE_F — ELO 1970, themes: crushing, endgame, fork, side to move: White
• Puzzle zwwhE_M — ELO 1970, themes: crushing, endgame, fork, side to move: Black
• Puzzle vTPG6 — ELO 2018, themes: endgame, exposedKing, hookMate, side to move: White
• Puzzle vTPG6_M — ELO 2018, themes: endgame, exposedKing, hookMate, side to move: White
• Puzzle zgaRd_M — ELO 2329, themes: advancedPawn, crushing, defensiveMove, 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).