Forum for Most Difficult Problem Ever
Why the solution is not the solution [#1790]
Dia. Solution 21-30: Black is 1 point better if he exchanges Black S11 for White R12 before Black 21.
Dia. Why White cannot capture: White CAN play this sequence about 60 moves later (White 8 captures Black 1 in Sente). It remains true that she cannot capture the big Black group in the top right, but she gets an advantage of 4 points in this area (the captured Black stone plus 3 points of territory that Black will not get any more). So a 3-point-win for Black reverts into a 1-point-win for White.
And the most difficult problem ever remains unsolved !
Dia. Solution 21-30: Black is 1 point better if he exchanges Black S11 for White R12 before Black 21.
Harry Fearnley: I guess that you mean "... exchanges Black S10 for White R11 ..."? The S10-R11 exchange is also sente for White, at almost any time. If Black ever has to sacrifice the large group at top right, Black will surely be 2 points (not just 1 point) better off -- one point for the stone, and one for the point it is on -- if Black has played the exchange first?
The analysis here on Sensei's library, is somewhat outdated.
This, and many other points, are covered in the ![[ext]](images/extlink.gif)
exhaustive analysis on the page maintained, for the Deutsche Go Bund, by Thomas Redecker.
![[Welcome to Sensei's Library!]](images/stone-hello.png "Sensei's Library")