Puzzle zzWJ8_M — ELO 1243
This is a Black-to-move puzzle rated 1243 ELO. The first move is d2b2, tagged with 10 interpretable concepts and Lichess themes: advantage, deflection, endgame.
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Position
Black to move. ELO 1243. Themes: advantage, deflection, endgame, quietMove, rookEndgame, veryLong.
FEN: 1kr5/2p2ppp/Rp2p3/1P2P3/5P2/4R3/3r2PP/6K1 b - - 1 30
Show solution (8 ply)
Try to find the move yourself first — look for the rarest concept firing on this position before peeking. Solution sequence: d2b2 e3a3 b2b5 a6a8 b8b7 a3a7 b7c6 a8c8
Concepts that fire on this position
Our SAE pipeline tagged this position with 10 active features. Each links to a page documenting that pattern in detail.
Why this puzzle is hard
The rarest pattern firing here is Detects a pawn on the 3rd or 4th rank that is attacked by at least one enemy…, which appears in only 26 of our 9,950 puzzles (0.26%). Rare patterns tend to be the bottleneck — players who haven't internalised them will fail this puzzle even when their tactical calculation is otherwise solid.
The puzzle's Lichess ELO of 1243 reflects this: solvers below that rating typically miss the cue entirely.
Similar puzzles
Puzzles sharing the most concept tags with this one — a stronger signal than theme overlap because it reflects the actual patterns Leela recognises.
Train this pattern
Click through to the Climbchess trainer to attempt the position interactively against the same Leela network that tagged it. The trainer adapts difficulty using your live concept-recognition profile — it surfaces puzzles tagged with concepts you've been missing, not random brawls.
If you want the underlying methodology, the how-it-works page walks through the SAE training run, the labelling pipeline, and the puzzle-tagging procedure end-to-end.
Frequently asked
What is the rating of this puzzle?
1243 Lichess ELO. Solvers below that rating typically miss the key cue.
Which side moves first?
Black to move; the first move of the solution is d2b2.
What concepts does it train?
10 SAE-derived patterns including A king on the back rank exposed to at least one enemy…; Detects a pawn on the 3rd or 4th rank that is attacked by…; Black king in a late endgame, frequently near the back….
Can I attempt it without an account?
Yes — Climbchess requires no signup or email. Click the trainer link to play the position interactively.