Starting position #75
Back-rank setup: NNRKBQRB
SP-75 · ThroneScout — Centre-file king, rim knight: 204 of the 960 positions share this pattern.
Move the pieces right on the board — full Chess960 rules, castle by dropping the king on the rook.
Position features
The king starts on d1, the rooks on c1 and g1, the queen on f1.
Castling long simply swaps the two pieces: the king on d1 and the rook on c1 trade places.
A bishop starts in the corner on h1: it has a single diagonal, which the g-pawn unlocks, running out to a8.
The second rank carries 3 pawns with no defender at all: a2, b2, h2.
The setup belongs to the ThroneScout family; read right to left it becomes position 881.
The engine's main line opens with g4.
Every sentence here is computed from the setup itself and can be checked on the board.
Balance
MBI 18 Morozov Balance Index: 18 of 100 — class D — largest edge.
- Engine evaluation of the starting position: +38 centipawns for White (depth 46, 400 000 000 nodes).
- Rank 794 of 960 by balance — 1 is the most balanced start.
- Balance band M — moderate edge · dynamics along the play-out: equalizing
- Evaluation along the engine's main line (60 half-moves): +44 → +31 → +19 → 0
Position facts
- Mirror twin: position #881
- The king starts on d, the rooks on c and g
- King and rook are neighbours — castling from adjacent squares feels unusual
- This position does not come up as the daily position in the next four years
Puzzles from this position
- Attack on the uncastled king: knight to b7 — Chess960 specifics · 620
- Attack on the uncastled king: pawn to g5 (f4·6) — Chess960 specifics · 780
- Attack on the uncastled king: knight to e4 (c3·13) — Chess960 specifics · 780
- Winning blow: knight to c6 (a5) — Chess960 specifics · 920
- Winning blow: king to b1 (c1·9) — Chess960 specifics · 970
- Winning blow: queen to g2 (f1) — Chess960 specifics · 1250
- Mate in 2: queen to c7 (c4) — Chess960 specifics · 1320
- Winning blow: king to b1 (c2·7) — Chess960 specifics · 1390
- Attack on the uncastled king: knight to b7 (a5·27) — Chess960 specifics · 1560
- Winning blow: rook to e5 (e1·14) — Chess960 specifics · 2100
This position appears in course day 1
In your browser or in the Android app. Nothing to install · Free, no ads
Commentary
Long castling swaps the king on d1 with the rook on c1, and three pawns — a2, b2 and h2 — begin with no defender at all. A knight is in the corner on a1 with b3 as its only move; a bishop is in the corner on h1 with a single diagonal to a8. The queen stands on f1, the second bishop on e1. The second knight stands on b1, and the rooks split to c1 and g1. The line in the dataset opens g4, Black castles long at once with O-O-O, and after d4 Nb6 White castles the same way: O-O-O d5.
Written from the measured facts above and checked against the board before publishing. All 960 positions have one.