Problem 15640

[drahacikfm]

Yet another ambiguous high-rated problem.  I played 1.Qe6 and Rybka says Black must play 1...Qf6 2.Qxf6+ Kxf6 and then 3.Bd5 is +3.69, completely winning endgame.

In the starting position, Rybka gives six moves more than +3.40.  Yes, the move in the problem 1.Qf4 is the best of those, but it's clearly an ambiguous problem, and that's the reason it has a high rating.

[richard]

I haven't looked at this one in detail but I believe it falls into the same bucket as the others.

I'll get onto the new generator ASAP.

Richard.

[drahacikfm]

Do you have a way to lock a good problem, so the generator does not disable it or change the moves?  For example, if you manually put in a more human defense to a problem, you wouldn't want the generator to touch that problem on a later run.

[richard]

I've added half the code needed to lock problems (both good and bad). I just alluded to this in another thread, I need to finish this before I can effectively disable problems manually otherwise if the generator doesn't stop generating the bad problem it will re-enable it next time around.  This isn't hard to fix but as I said in the other thread I'd rather spend the time on urgently fixing the generator.

Regards,
Richard.

[slacker00]

Yeah, this one is pretty bad.  In the solution line, white wins the rook, otherwise the knight falls in the other winning lines.  Either way,  it's completely  winning.  I'd still rather  take the rook, though.  I'm not sure what to say about these ambiguous problems right now.

[richard]

I Just had a quick peek at what the new generator thought of this position and the new generator will throw this one away due to having too many alternative lines.

Regards,
Richard.