the library · reviewed 2026-09-28

Nogerbek – Zhang

Liaocheng Dongchangfu Cup · 2026.07.18 · Elo 2494/2427 · tactic · ★★★★

The daily position for Saturday 26 September 2026. It is still open to solve — the grader reads your whole line, sidelines and evaluation included, before anything here is shown. Cover the solution and solve it first →

White to move. the model gives this to 1 in 9 at this level.

The solution

54.c7! (not 54.b7? ♔︎d6 55.♔︎c1 ♖︎b4 56.♔︎d2 ♔︎c7 ∓) 54…♔︎d6 (if 54…♔︎d7 then 55.♖︎a8 ♖︎b1+ 56.♔︎c2 +−) 55.c8=♕︎ ♖︎xb6 56.♕︎b8+ ♔︎d5 57.♖︎xb6 ♗︎xb6 58.♕︎xb6 +−

54.c7 — most players miss this
55.c8=♕︎ — the standard move
56.♕︎b8+ — almost nobody finds this · worth +1
57.♖︎xb6 — hard to find · worth +1 · the fair stop: the line may end here
58.♕︎xb6 — routine — shown for completeness, never demanded

“hard to find”, “the natural move” and the rest describe how often this move is played by Maia-2, weighted across the 1500/1900/2000 audience the difficulty model is fitted on — a model of human play, not a count of anyone who solved this position.

Members can take this away as a PGN — the diagram, the verified line and their own analysis in one file, for a database, Anki or Chessable.

What happened at the board

Nogerbek found it · 1-0

the game went on 54…♔︎d7 55.♖︎a81-0full game ↗

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