Search found 389 matches

by jhellis3
Mon Oct 14, 2019 8:36 pm
Forum: Computer Chess Club: General Topics
Topic: Winning after Qf6+!
Replies: 79
Views: 1765

Re: Winning after Qf6+!

Yeah, did some more manual analysis and it looks lost regardless at that point.... it might be possible for Black to still play Nxa3 after the bishop captures h5 with the same Nb5 plan, but it makes no (apparent) sense to play this way unless allowing the pawn capture with the rook creates some issu...
by jhellis3
Mon Oct 14, 2019 7:33 pm
Forum: Computer Chess Club: General Topics
Topic: Winning after Qf6+!
Replies: 79
Views: 1765

Re: Winning after Qf6+!

I did? N/m I found it...
by jhellis3
Mon Oct 14, 2019 7:21 pm
Forum: Computer Chess Club: General Topics
Topic: Winning after Qf6+!
Replies: 79
Views: 1765

Re: Winning after Qf6+!

Also, what is the supposed "winning" line for White after Bd2?
by jhellis3
Mon Oct 14, 2019 4:50 pm
Forum: Computer Chess Club: General Topics
Topic: Winning after Qf6+!
Replies: 79
Views: 1765

Re: Winning after Qf6+!

An evaluation of 0.00 in the line you've posted is wrong. 3...h5 is a blunder that allows White to win. 3...Nxa3 is correct. How sure of this line are you? Not immediately clear to me why Black sacs its queen on move 28? I did a quick multi-pv search with Crystal after shuffling the f rook instead,...
by jhellis3
Wed Oct 09, 2019 11:10 pm
Forum: Computer Chess Club: General Topics
Topic: is this a fortress?
Replies: 17
Views: 1941

Re: is this a fortress?

Of course, one is free to think whatever he or she chooses; I'm just interested in the objectively correct outcome of the position. And I have no idea what engines someone else is using, but I strongly suspect that black giving up two pawns for no apparent compensation is far from optimal play..... ...
by jhellis3
Wed Oct 09, 2019 9:42 pm
Forum: Computer Chess Club: General Topics
Topic: is this a fortress?
Replies: 17
Views: 1941

Re: is this a fortress?

I'm now quite confident that the penultimate position is also won, and that it is quite achievable from the antecedent position. Therefore, the main question comes down to whether white can hold on to the b pawn from here: 8/2p3pp/5p2/1k6/1P1R2P1/4NKP1/q5P1/8 b - - 5 49 If White can't hold the b paw...
by jhellis3
Wed Oct 09, 2019 9:32 pm
Forum: Computer Chess Club: General Topics
Topic: is this a fortress?
Replies: 17
Views: 1941

Re: is this a fortress?

While I don't know the correct result of the position, in my own analysis with the latest revision of Crystal, I found it (and the SF mod with FD) deviates from the line posted above at move 37, preferring ...Kb7 instead (or a transposition to the same position). My own human intuition tells me the ...
by jhellis3
Tue Oct 08, 2019 3:04 pm
Forum: Computer Chess Club: General Topics
Topic: is this a fortress?
Replies: 17
Views: 1941

Re: is this a fortress?

Not sure what this 'fortress code' does, but it doesn't seem to be much good.
Yikes.
by jhellis3
Sat Aug 31, 2019 3:27 pm
Forum: Computer Chess Club: General Topics
Topic: Engine playing from database
Replies: 4
Views: 499

Re: Engine playing from database

What you describe is not practically possible due to the sheer number of gamestates/positions.

https://en.wikipedia.org/wiki/Shannon_number

Or to put it another way, if it was practically possible, chess would be solved. And it is.... for 7 pieces or less ;).
by jhellis3
Thu Aug 29, 2019 5:52 pm
Forum: Computer Chess Club: General Topics
Topic: Crystal, the new tactical monster
Replies: 25
Views: 4227

Re: Crystal, the new tactical monster

As Mike pointed out, there is no real anomalous behavior here. When the switch to Rh1 occurs, it is still a vast improvement from -6 to -1 (the search has not yet seen that Bxh7+ is winning). TBs usage can result in different search cutoffs at different plies & depths, which can add some variability...