Search found 270 matches

by Arpad Rusz
Thu Sep 14, 2017 9:22 am
Forum: Computer Chess Club: General Topics
Topic: KNPPKBP longest win
Replies: 23
Views: 4020

Re: KNPPKBP longest win

I have succeeded composing a good introductory play! Michael B, I won't show it here because then it will be not accepted in a tournament where first publication is required. But I will send you by PM. We could have a joint composition.
by Arpad Rusz
Thu Sep 14, 2017 9:10 am
Forum: Computer Chess Club: General Topics
Topic: KNPPKBP longest win
Replies: 23
Views: 4020

Re: KNPPKBP longest win

In order to make it a better study, we should try to find a position where white starts. For example:

[D]8/8/8/K7/8/kpR5/2b5/r1R5 w - - 0 1

1.R1xc2! (1.Rxa1? Kb2! fork) etc.

This scheme has the drawback of capturing an innocent bishop (which hasn't played during solution).
by Arpad Rusz
Thu Sep 14, 2017 8:56 am
Forum: Computer Chess Club: General Topics
Topic: KNPPKBP longest win
Replies: 23
Views: 4020

Re: KNPPKBP longest win

I didn't find it , syzygy found it :D . It is the longest cursed win with the KRRvKRP ending. As part of the syzygy tablebase creation process, the syzygy creation tool outputs the longest cursed win for each endgame set in a text file. I also have that list with the longest cursed wins. Maybe ther...
by Arpad Rusz
Wed Sep 13, 2017 10:57 am
Forum: Computer Chess Club: General Topics
Topic: KNPPKBP longest win
Replies: 23
Views: 4020

Re: KNPPKBP longest win

MikeB wrote: [d]8/8/8/K7/8/kpR5/2R5/r7 b - - 0 1
This position can be turned into a study! 8-)
How did you find it?
by Arpad Rusz
Tue Sep 12, 2017 9:41 am
Forum: Computer Chess Club: General Topics
Topic: KNPPKBP longest win
Replies: 23
Views: 4020

KNPPKBP longest win

[pgn] [Event "EG#188"] [Site "?"] [Date "2012.??.??"] [Round "?"] [White "Bourzutschky & Konoval"] [Black "?"] [Result "1-0"] [SetUp "1"] [FEN "8/2p5/8/8/6b1/1PP5/K7/1N5k w - - 0 0"] [PlyCount "203"] {"For the KNPPKBP endgame the longest win is 102 moves and there is only one record position."} 1. N...
by Arpad Rusz
Mon Sep 11, 2017 6:26 pm
Forum: Computer Chess Club: General Topics
Topic: Test position
Replies: 14
Views: 1892

Test position

[D]5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - 0 1 In an EG article from 2010, Emil Vlasák wrote the following about this endgame study (Korolkov, 1950?): "The zugzwang problem is combined with an unexpected key, which could easily be excluded from the candidate moves by selective algorithms. The classics Hi...
by Arpad Rusz
Thu Sep 07, 2017 3:05 pm
Forum: Computer Chess Club: General Topics
Topic: Capablanca's Theorem Q+N > Q+B
Replies: 35
Views: 4270

Re: Capablanca's Theorem Q+N > Q+B

If you take a random tablebase position with WTM you have the following chances:

QN vs. QB
37.47% White wins
5.90% Black wins
56.63% Draw

QB vs. QN
45.32% White wins
3.35% Black wins
51.33% Draw

This also demonstrates the slight edge of QB over QN.
by Arpad Rusz
Wed Sep 06, 2017 3:34 pm
Forum: Computer Chess Club: General Topics
Topic: Capablanca's Theorem Q+N > Q+B
Replies: 35
Views: 4270

Re: Capablanca's Theorem Q+N > Q+B

Likewise the queen + knight tend to work better than queen + bishop in the endgame because the queen + bishop duo can sometimes be redundant. This might be true but it doesn't hold against two rooks: QN vs RR is a general draw while QB vs RR is a general win. The rook pair's main resource is the th...
by Arpad Rusz
Sat Aug 26, 2017 6:26 pm
Forum: Computer Chess Club: General Topics
Topic: Getting rid of the 50 move rule
Replies: 4
Views: 863

Re: Getting rid of the 50 move rule

Thanks, Ronald!