# Can white castle?

• 2 years ago · Quote · #1

Composed by me. Can white castle in this position?

First solver gets a trophy. Yeay!

• 2 years ago · Quote · #2

No, because for the black rook to get in, the white king would have had to move out of the way.

• 2 years ago · Quote · #3

My 1st impression is no, the rook on a1 must be a promoted g pawn, and there's just not enough possible captures to get it to a1?

• 2 years ago · Quote · #4

i dont think its is possible.

• 2 years ago · Quote · #5

That black rook could be a promoted pawn, and there are enough peices missing (assuming white also promoted his h-pawn on g8 by capturing blacks original rook somewhere on the g-file) for this to be possible.  So, the answer is maybe.

• 2 years ago · Quote · #6
TheGrobe wrote:

That black rook could be a promoted pawn, and there are enough peices missing (assuming white also promoted his h-pawn on g8 by capturing blacks original rook somewhere on the g-file) for this to be possible.  So, the answer is maybe.

But the g pawn can only capture on Black squares, it could never have captured the light square bishop. It also could not have captured the h pawn

• 2 years ago · Quote · #7

Hmm, here's the problem:  In order for Black's g-pawn to get across to a1 in the number of captures available (six) it would have to have taken the most efficient route -- along the a1-h8 diagonal.  Unfortunately,  one of white's missing peices is a white squared bishop, and couldn't have been captured on any of the candidate squares.

White cannot castle.

• 2 years ago · Quote · #8
rooperi wrote:
TheGrobe wrote:

That black rook could be a promoted pawn, and there are enough peices missing (assuming white also promoted his h-pawn on g8 by capturing blacks original rook somewhere on the g-file) for this to be possible.  So, the answer is maybe.

But the g pawn can only capture on Black squares, it could never have captured the light square bishop. It also could not have captured the h pawn

You beat me to it.

• 2 years ago · Quote · #9
rooperi wrote:
TheGrobe wrote:

That black rook could be a promoted pawn, and there are enough peices missing (assuming white also promoted his h-pawn on g8 by capturing blacks original rook somewhere on the g-file) for this to be possible.  So, the answer is maybe.

But the g pawn can only capture on Black squares, it could never have captured the light square bishop. It also could not have captured the h pawn

It could have captured the h-pawn after it promoted, but the light squared bishop is the key.

• 2 years ago · Quote · #10

To think that I came in here to make a Harold and Kumar joke, and actually ended up intrigued by the puzzle.

• 2 years ago · Quote · #11

I was thinking the same thing, but knowing shoopi, there could be something weird we missed.

• 2 years ago · Quote · #12

Ah, White's h pawn could capture a Black rook on g7, I missed that

• 2 years ago · Quote · #13
TheGrobe wrote:

To think that I came in here to make a Harold and Kumar joke, and actually ended up intrigued by the puzzle.

Alternatively, it could have been a joke about a similar checkers puzzle: Can burger king?

• 2 years ago · Quote · #14

You guys have the right thinking process here ^^

But there is more in the position than what it may seem...

• 2 years ago · Quote · #15

AGGH! I was so close!!

• 2 years ago · Quote · #16
very nice puzzle.
• 2 years ago · Quote · #17

1.h4 Nf6 2.b3 Rg8 3.Bb2 Nd5 4.h5 Nf6 5.Nf3 Nd5 6.Nh2 Nf6 7.Ng4 Nd5 8.Nf6+ gxf6 9.h6 Rg7 10.hxg7 Nf4 11.g8=Q Nh5 12.Be5 Na6 13.Na3 Nb8 14.Rb1 Na6 15.Qc1 Nb8 16.Qb2 Na6 17.Qd4 Nb8 18.Qg3 Na6 19.Qgc3 Nb8 20.Rb2 fxe5 21.Nb1 exd4 22.g3 dxc3 23.Bg2 cxb2 24.Bd5 Nf6 25.Na3 Ne4 26.Nb1 Nc3 27.Na3 Nd1 28.Bc4 b1=R 29.Bd5 Ra1 30.Nb1 Nc3 31.Bc6 Na4 32.Bd5 Nc5 33.Be4 Nca6 34.Bd5 Nc6 35.Be4 Ncb4 36.Bg2 Nd5 37.Bf3 Nf6
*

• 2 years ago · Quote · #18

The issue of the light squared Bishop's capture is inescapable.  I don't see how the rook can possibly be a promoted pawn.

• 2 years ago · Quote · #19

But I can't find a way to lose the bishop without zugzwang.

• 2 years ago · Quote · #20
oinquarki wrote:

1.h4 Nf6 2.b3 Rg8 3.Bb2 Nd5 4.h5 Nf6 5.Nf3 Nd5 6.Nh2 Nf6 7.Ng4 Nd5 8.Nf6+ gxf6 9.h6 Rg7 10.hxg7 Nf4 11.g8=Q Nh5 12.Be5 Na6 13.Na3 Nb8 14.Rb1 Na6 15.Qc1 Nb8 16.Qb2 Na6 17.Qd4 Nb8 18.Qg3 Na6 19.Qgc3 Nb8 20.Rb2 fxe5 21.Nb1 exd4 22.g3 dxc3 23.Bg2 cxb2 24.Bd5 Nf6 25.Na3 Ne4 26.Nb1 Nc3 27.Na3 Nd1 28.Bc4 b1=R 29.Bd5 Ra1 30.Nb1 Nc3 31.Bc6 Na4 32.Bd5 Nc5 33.Be4 Nca6 34.Bd5 Nc6 35.Be4 Ncb4 36.Bg2 Nd5 37.Bf3 Nf6
*

Of course -- promotion on b1 instead of a1.  Clever repositioning of that Knight threw me off.