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Winning blow: knight to g3

c9-01837
Shuffle Rating 780Theme: Chess960 twist: use the unusual starting setup of the pieces.
White to move — find the best continuation

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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 780 ShuffleRating — for beginners taking their first steps in Chess960 tactics.

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 e1, rook a1 f1, bishop c1 e4, knight e2, pawn b2 g2 c3 a4 f5.

Black: king c7, queen g3, rook a8 e8, bishop b6 c8, pawn c5 g5 f6 a7 b7 h7.

11 white and 12 black pieces are on the board; the puzzle position arises after move 18.

The position in numbers

Black are ahead by 7 points of material (24 against 31; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on e1, the black king on c7.

It is White to move on move 18, with 4 legal replies to weigh — only the line that keeps the advantage solves the puzzle. White are in check right now, so every reply must answer the check.

White keeps 5 pawns, Black 6. Files fully open (no pawns of either colour): d, e — natural highways for the rooks and queen. Half-open for White: h.

The White king has 2 empty squares to step to right now — the fewer they are, the closer a mating net.

Solution & explanation

Main line

18. Nxg3 h5 19. a5 h4 20. axb6+

Why it works

  • Great move! knight to g3 keeps the pressure (+3.1).
  • pawn to a5 develops smoothly.
  • Precise: pawn to b6 is the top choice (+3.7).
  • You win a piece — the queen.
  • If instead c4, then a5 and you win the queen.

Move by move

  • 18. Nxg3 — knight to g3 (capture)

Types in this puzzle

Hanging piece

A piece is left without protection — just take it.

A hanging piece is simply an unprotected piece you can take for free. It sounds primitive, yet most amateur games are decided exactly this way. Build the habit: before every move, sweep the board and note every undefended piece, yours and theirs. The classic mistake is hunting for a brilliant combination when all you need to do is bend down and pick up the gift.

Only move

Everything else loses — find the only move that holds.

An only move is a position where everything loses except one single continuation. You cannot play "by hand" here: run through fundamentally different defenses — run away, block, trade, counterattack — and discard the ones that fail. The hallmark of these puzzles is that the obvious moves lose quickly while the solution often looks strange. First understand exactly what the threat is — then the one saving move reveals itself.

Counter-strike

Don't defend — answer the threat with a bigger one.

The counter-strike: instead of defending against the threat, you answer with a bigger threat of your own. While your opponent grabs a pawn, you deliver mate — the arithmetic favors you. Look for a counter when direct defenses fail: do you have a check, an attack on the queen, a mating threat? The beginner's error is meeting every threat with a reflexive defense without checking the counterattacking resources first.

About this position

These pieces come from starting position #885.

SP-885 · ThroneScout — Centre-file king, rim knight: 204 of the 960 positions share this pattern.

The king starts on e1, the rooks on a1 and f1, the queen on b1.

The kingside rook already stands on f1, so castling short moves only the king, from e1 to g1.

The bishops stand on c1 and d1; their long diagonals reach h6 and h5 once the d- and e-pawns step aside.

The second rank carries 2 pawns with no defender at all: g2, h2.

The setup belongs to the ThroneScout family; read right to left it becomes position 74.

The engine's main line opens with Nf3, bringing the knight out to f3.

Morozov Balance Index: 92 of 100 — class A — most balanced. Engine evaluation of the starting position: +14 centipawns for White (depth 47, 400 000 000 nodes).

In 50 self-play games White scored 51.0% (95% CI 37.6–64.3%).

Explore position #885

Provenance

Mined from the project's engine self-play games.

Verified by Stockfish at depth 20+.

Solution forcedness confirmed (verified).

Pack 001 · SP-885

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