Terry McCracken wrote:Uri Blass wrote:I agree that this is more convincing and can be used for what I consider as a real proof that I am lazy to construct(I still do not consider it as a proof inspite of the fact that it convinced me).
I think that black even does not need the quare a6 and can do fine even on 7*7 board with only c6 and b6
In order to construct a proof that I am too lazy to do we pracitcally need simply to divide the possible pair of squares of white king and white queen to 12 classes and give the corresponding squares of black king and rook in every class.
After this we need to prove that after white does a move in one of the classes black can capture the queen or make a move that goes to one of the classes.
Uri
Huh??
Robin gave proof, and it's quite simple
Page One....
http://www.talkchess.com/forum/viewtopi ... 72&start=0
Robin's post is convincing but I do not consider it as a proof.
I simply disagree with you about the meaning of the word proof.
Robin gave a strategy to draw the game.
A proof should prove that the strategy is really possible and that white cannot do something different that I did not imagine.
I am not sure if we practically need to do what I suggested and it is only one way to prove the draw.
Thinking about again it may be more simpler to prove that the strategy that Robin suggested is possible but it needs proof.
Here is part of the proof that you need to write in order to prove it based on my standards and not only in order to convince me(I added comments to Robin comments inside the ().
2) If the king is in check, move out of check to any one of the squares h7, g8, h8(possible but need proof because the queen may control all 3 squares from g7 and if the white king is at f8 white is winning
the white king can never go to f8 but in order to prove that black draw we need to mention the possible squares of the white king and prove that white cannot escape them in every one of the cases)
3) If the rook is not on f6 move the rook to f6(possible assuming the rook is not pinned but the rook cannot be pinned when the black king is at h7 g8 h8 and the rook is at f6 f2 c6 b6 a6).
Uri
