Where are the hidden pieces in this chess position? [Chess Puzzle #2]
6
800Ṁ821
Dec 25
58%
b7
34%
f5
34%
g6
7%
h3
7%
b2
7%
h1
6%
h8
Resolved
YES
a3
Resolved
YES
a5
Resolved
YES
a8
Resolved
YES
c5
Resolved
YES
d1
Resolved
YES
e2
Resolved
YES
e5
Resolved
YES
e7
Resolved
YES
f3
Resolved
YES
g1
Resolved
YES
g8

I have chosen a chess position. Can you guess where the hidden pieces are?

The position is puzzle-like position based on an engine self-play game starting from a prescribed opening, where black has deviated from the engine line in a way that allows white to gain a game-winning advantage. It is white's move and there is only one best move in this position.

The board is partially hidden, as follows:

- All of the squares containing pawns are revealed.

- All of the squares containing non-pawn pieces are initially hidden.

- A randomly chosen selection of empty squares are also initially hidden.

- Hidden squares are represented by a circle.

The purpose of this market is to guess which hidden squares have pieces. There's a sister market for guessing what the best move is here: https://manifold.markets/moobunny/whats-the-best-move-in-the-hidden-c

Each day, around 2 PM Pacific time, I will check which square has the highest probability in this market and resolve it, to YES if there is a piece in that square and NO if it's empty. Ties will be resolved alphabetically. If the square is empty, I will repeat with the next highest, then the next, and so on until a piece is revealed. When all options are resolved, I will immediately resolve the sister market. Then I'll post a comment revealing what's in the resolved squares.

I will not bet in this market.

Salted MD5 of the position for verification: 7fafcfdb794e1a785fffa12d31df6077

Happy hunting!

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Day 11:

b3, c3, and a7 are empty.

There is a white bishop at e5!

Day 10:

c7 and f6 are empty.

There is a white bishop at e2!

Day 9:

e1 is empty.

There is a black queen at e7!

Whoops, forgot about this! One sec

Day 8:

There is a black knight at c5!

Day 7:

d3 and e4 are empty.

There is a white knight at f3!

Day 6:

b1 and b8 are empty.

There is a black knight at a5!

Day 5:

There is a white rook at d1!

Day 4, early because I'm going to be away in the afternoon:

There is a black king at g8!

Day 3:

There is a black rook at a8

Day 2:

f1, d8, a1, and a2 are empty.
There is a white queen at a3!

Day 1:
There is a white king at g1!

Day 0:

Initial information:

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