Winning blow: pawn to f8 (f7·2)
c9-16165naming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Chess960 twist: use the unusual starting setup of the pieces.
Winning tactic: there is a move that gains a decisive advantage — find it.
Difficulty 1280 ShuffleRating — club-player level.
White to move — find the best continuation
How to recognize this tactic
In Chess960 the pieces start on unfamiliar squares, so tactics appear earlier and from unusual angles. Do not trust classical patterns — read the actual lines of the bishops, the rooks and the queen from where they really stand in this position.
This position hides a concrete tactic that wins material or mates. Start with the most forcing candidate moves — checks, captures and threats — and calculate each to a clear end before choosing; the winning line is usually the one the opponent cannot meet.
General method: before you move, list the forcing candidates — every check, every capture, every direct threat — and calculate those first. The solution to a tactic is almost always among them.
Position on the board
White: king c1, rook e1, bishop c3 g6, pawn d2 a4 e6 f7.
Black: king e7, rook h2, bishop e2, pawn a5 h5 b6.
8 white and 6 black pieces are on the board; the puzzle position arises after move 39.
The position in numbers
White are ahead by 4 points of material (15 against 11; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on c1, the black king on e7.
It is White to move on move 39, with 30 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 3. Files fully open (no pawns of either colour): c, g — natural highways for the rooks and queen. Half-open for White: b, h.
White hold the bishop pair, an edge in open lines. The White king has 3 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
39. f8=Q+ Kxf8 40. Bf6 Kg8 41. e7
Why it works
- Best move. pawn to f8 is exactly what the engine plays (#4).
- Well found: bishop to f6 (#3).
- A natural move: pawn to e7.
- You win decisive material (+15.0).
- If instead Kxf8, then Bf6 and you stay on top.
Move by move
- 39. f8=Q+ — pawn to f8 with check
Types in this puzzle
Promotion
The pawn reaches the last rank and becomes a queen — decisively.
Promotion turns a pawn on the last rank into a queen and rewrites the evaluation on the spot. In tactics the passer rarely walks in for free — usually a sacrifice clears its path. Count the tempi: how many moves does the pawn need, and can the defender stop it in time? And watch the promotion square itself — it must be out of enemy reach or won by force in your combination.
Promotion race
Both sides push passers — win the race by a tempo.
A promotion race is a sprint between two passed pawns: both sides push toward the last rank, and victory goes to whoever queens first or queens with check. You will recognize it when both players have far-advanced passers that neither king can catch. Count the tempi literally, move by move, all the way to promotion. The classic mistake is spending a tempo on a "useful" move — in a race, almost any non-pawn move loses.
Breakthrough
A pawn sacrifice tears the chain open and lets a passer through.
A breakthrough is a pawn sacrifice that rips the opponent's chain open and creates an unstoppable passer. Look for it where the pawns are locked against each other: often two pawns are given up so the third one slips through. Check the square rule — can the enemy king catch the new passer? If not, sacrifice with confidence; the classic error is breaking through while his king stands right there eating everything.
About this position
These pieces come from starting position #624.
SP-624 · ThroneScout — King on a central file (d/e) with a knight starting on the rim (a/h).
The king starts on e1, the rooks on c1 and g1, the queen on f1.
Castling ends where it always does: king to g1 and rook to f1 on the short side, king to c1 and rook to d1 on the long one.
A bishop starts in the corner on a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.
One second-rank pawn starts with no defender at all: h2.
The setup belongs to the ThroneScout family; read right to left it becomes position 239.
The engine's main line opens with c4.
Morozov Balance Index: 80 of 100 — class A — most balanced. Engine evaluation of the starting position: +17 centipawns for White (depth 47, 400 000 000 nodes).
Explore position #624Provenance
Mined from the project's engine self-play games.
Pack 009 · SP-624
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