Math Puzzle (hard)

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Seppppppy

Ok I guess this really isn't a puzzle, but I saw it in MATHCOUNTS, (I got 29/30 on Sprint):

Prove that if each player has two turns on each move, White has a strategy to not lose. 

DM me the answer

MothmanHArk

Well, basically frick this if it doesn't have a visual representation on its account. 

MothmanHArk

I'll just put a game that has white win here: https://www.chess.com/games/view/16372499

 

Seppppppy
MothmanHArk wrote:

I'll just put a game that has white win here: https://www.chess.com/games/view/16372499

 

i don't understand

Seppppppy
Seppppppy wrote:

Ok I guess this really isn't a puzzle, but I saw it in MATHCOUNTS, (I got 29/30 on Sprint):

Prove that if each player has two turns on each move, White has a strategy to not lose. 

DM me the answer

I'll add more context here: 

These

JkCheeseChess

? so is this a chess-related puzzle or what

JkCheeseChess

exactly lol

white can just move the queen out and if black doesn't defend you can capture the f7 pawn and then the king on the same move because you get 2 turns

Seppppppy
ant wrote:

wdym a strategy to not lose. white would have the advantage here

prove it

it is simple to prove

 

Seppppppy
TheCheeseDuck wrote:

exactly lol

white can just move the queen out and if black doesn't defend you can capture the f7 pawn and then the king on the same move because you get 2 turns

g6-gxh5

Seppppppy

guys, there is no chess involved

use proof by contradiction

JkCheeseChess

ok if it has nothing to do with chess is it in general for any game where the first player always has a strategy to never lose?

and what would the starting assumption be? assuming that there is no strategy where white wins? 

MrXX2018

I know the the solution for chess with double moves. Let's suppose that black will win no matter white plays. If white can just stay (Ng1-f3, Nf3-g1), now we have initial position, but with black turn. Now if it was white turn, they lose. If it's black turn, black loses. Black also needs to repeat moves to draw. What was required.

Chessisfunforme
Seppppppy wrote:

Ok I guess this really isn't a puzzle, but I saw it in MATHCOUNTS, (I got 29/30 on Sprint):

Prove that if each player has two turns on each move, White has a strategy to not lose. 

DM me the answer

I also took MATHCOUNTS and i can confirm that 1) this was NOT on the sprint and 2) if this was you would be violating the honor code. also 3) proof-based problems are not on MATHCOUNTS.

TigerBabyHro

you are correct

mathcounts has no proof based problems and also, it doesn't make sense that they have chess problems

Seppppppy
Chessisfunforme wrote:
Seppppppy wrote:

Ok I guess this really isn't a puzzle, but I saw it in MATHCOUNTS, (I got 29/30 on Sprint):

Prove that if each player has two turns on each move, White has a strategy to not lose. 

DM me the answer

I also took MATHCOUNTS and i can confirm that 1) this was NOT on the sprint and 2) if this was you would be violating the honor code. also 3) proof-based problems are not on MATHCOUNTS.

I know, I didn't take it from MATHCOUNTS, I just saw the problem when I was there. 

Seppppppy
MrXX2018 wrote:

I know the the solution for chess with double moves. Let's suppose that black will win no matter white plays. If white can just stay (Ng1-f3, Nf3-g1), now we have initial position, but with black turn. Now if it was white turn, they lose. If it's black turn, black loses. Black also needs to repeat moves to draw. What was required.

correct

TigerBabyHro

ah

Seppppppy
TheCheeseDuck wrote:

ok if it has nothing to do with chess is it in general for any game where the first player always has a strategy to never lose?

and what would the starting assumption be? assuming that there is no strategy where white wins? 

no, it's implied that it's for a chess game, sorry for no clarification.

look at mrxx2018 solution

alertf

ok im litterally 9 years old and i have no idea what the heck ur saying

Seppppppy

The game of double chess is played like regular chess, except each player makes two moves in their turn (white plays twice, then black plays twice, and so on). Show that white can always win or draw.