Chess Problem

Logic Level 1

It's white's turn to move. What is the minimum number of moves required for white to win?

11 4 6 2 19 7 8

Sai Ram by Sai Ram , 19, India

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2 solutions

Steven Perkins
Aug 20, 2015

With no knowledge of previous moves, my solution is:

  1. Qf1+ Kxh2 2. Rh3#
7 Helpful 0 Interesting 0 Brilliant 0 Confused

Same. This puzzle is too easy.

Seth-Riley Adams - 5 years, 2 months ago
Sai Ram
Jun 24, 2015

http://www.mrmip.net/mipsofacto/plaksin.htm.

Open this link.

We observe that this move is going to be the whites' 50 th move without killing a black.

Therefore in this move the white should kill a black to avoid 50 move game draw.

The best move for the white is Rook moving to g6 , killing the pawn.

Then the black moves Rook to g6 , killing the white rook.

Then the white moves Queen to f1 and there goes the check mate.

3 Helpful 0 Interesting 0 Brilliant 0 Confused

But black can play Rook g8 check on their move. So you can't force mate in 2 moves.

Jason Zou - 5 years, 10 months ago

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If black plays rook, it loses. The Queen will go down, which forces the king to move up vertically. No other move is legible. All white has to do is move the bishop such that it protects the rook such that both cannot be captured. Win.

Jase Jason - 5 years, 3 months ago

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Essentially, any move which removes the rook from the path of the Bishop to h2 creates a situation where the Queen can mate on its next available move (e1 or f1 depending on whether Black King moves to g1).

I believe what the comment above is correctly stating is that by creating a situation where the White King is in check, you delay the number of moves to mating Black. The Queen cannot go down (Qe1) on the 2nd move (after RxG6) if Black Rg8 and places White King in check.

But alas, all of this is irrelevant since the (poorly worded) question asks the "minimum" number of moves. This is assuming Black does not make the most prudent moves aimed at survival.

Thus, moving the White Rook out of the way followed by Qe1 is the minimum number of moves, 2.

Mike Smith - 4 years, 10 months ago

Was it proven that there had to have been exactly 49 moves before this position?

Alex Li - 5 years, 11 months ago

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Can you prove that black's last move was over 49 moves after the last time black moved a pawn or took a piece?

Jesse Nieminen - 5 years, 1 month ago

I think here it should be given that black wants to end this game as soon as possible because if not then on white queen to f1 then black can move its rook to g1.

Rajat Rathore - 5 years, 9 months ago

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White queen to f1 is check, so black is forced to move King. Not possible for black to move rook.

j chaturvedi - 5 years, 1 month ago

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