Puzzle IS3Ja_M — ELO 2568
This is a Black-to-move puzzle rated 2568 ELO. The first move is g1a1, tagged with 10 interpretable concepts and Lichess themes: attraction, exposedKing, hookMate.
Free forever · no email · no signup · delete data anytime.
Position
Black to move. ELO 2568. Themes: attraction, exposedKing, hookMate, mate, mateIn4, middlegame, pillsburysMate, veryLong.
FEN: r1b5/ppp1R3/1n3p1k/4N3/3P4/3B4/P2K1P1P/R5r1 b - - 13 23
Show solution (8 ply)
Try to find the move yourself first — look for the rarest concept firing on this position before peeking. Solution sequence: g1a1 e7h7 h6g5 f2f4 g5f4 h7h4 c8g4 h4g4
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 A white rook is active on an open file or rank, threatening or delivering a…, which appears in only 137 of our 9,950 puzzles (1.38%). 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 2568 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?
2568 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 g1a1.
What concepts does it train?
10 SAE-derived patterns including Detects kings in near-opposition or close proximity in…; Detects a king on the target square that is not attacked…; A white rook is active on an open file or rank….
Can I attempt it without an account?
Yes — Climbchess requires no signup or email. Click the trainer link to play the position interactively.