Search found 78 matches

by MOBMAT
Thu Oct 31, 2019 4:16 am
Forum: Computer Chess Club: General Topics
Topic: Analysis Software Question
Replies: 2
Views: 404

Analysis Software Question

I'm doing a study and wish to analyze some "mate in" problems. I'm currently using Arena but it doesn't appear to be able to correctly handle the conditions I wish to use. Example: How much time does it take engine A to find both the correct move at the correct depth (the "mate in" depth). Arena rar...
by MOBMAT
Wed Oct 23, 2019 7:40 pm
Forum: Computer Chess Club: General Topics
Topic: 2 testpositions from Chessbase. White to play and win!
Replies: 16
Views: 2041

Re: 2 testpositions from Chessbase. White to play and win!

1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1 Oh what a difference 6 years makes, LOL. Most recent SF on fairly good hardware with TBs found mate in 38 in 8h30m. 1.Qf4 h6 2.Qxh6+ Qxh6 3.Bxh6 Rb1+ 4.Kg2 Rb2+ 5.Kf1 Rb1+ 6.Ke2 Rb2+ 7.Kd3 e4+ 8.Kc3 Rc2+ 9.Kb3 Rf2 10.f8Q+ Rxf8 11.Bxf8 Nb1 12.Bh6 Kh7 13....
by MOBMAT
Wed Oct 23, 2019 4:05 am
Forum: Computer Chess Club: General Topics
Topic: Complex Puzzle
Replies: 330
Views: 51676

Re: Complex Puzzle

This goes back a few years...but here is a solution 3R1N2/2p1p2N/4p3/6p1/2P1P1qk/3PP3/P4K2/8 w - - 0 1 It appears to be a mate in 35... FEN: 3R1N2/2p1p2N/4p3/6p1/2P1P1qk/3PP3/P4K2/8 w - - 0 1 87 21:28 13,011,672k 10,102k +M35 1.Ng6+ Kh5 2.Nf6+ exf6 3.Ne5 fxe5 4.Rh8+ Kg6 5.Rh1 Kf7 6.a4 Ke8 7.a5 Kd8 8...
by MOBMAT
Tue Oct 22, 2019 7:06 pm
Forum: Computer Chess Club: General Topics
Topic: Does anyone know the source of this position?
Replies: 1
Views: 207

Does anyone know the source of this position?

8/8/4p1pp/2n5/r6P/R1p3K1/3k1R2/8 b - - 0 1 I picked up this position somewhere and had it marked as a possible draw. After letting SF DEV chew on it, it found a win (Syzygy score) at ply 50 in 28m and found a mate in 32 at ply 69 in 1h25m. There might be a faster mate but I stopped the search. I7-6...
by MOBMAT
Mon Aug 26, 2019 8:19 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Computer Olympiad Rules
Replies: 1
Views: 708

Computer Olympiad Rules

I see that the 2019 CO has completed. Congrats the HGM for his 2nd and 3rd in the Shogi events.

Can someone please provide a URL that has the official rules for different games played in the Computer Olympiad? I can't seem to locate them.
by MOBMAT
Wed Aug 21, 2019 1:38 pm
Forum: Computer Chess Club: General Topics
Topic: FEN's for other games
Replies: 7
Views: 786

Re: FEN's for other games

Thanks, Harm, now we are getting somewhere. I appreciate your input. I think the FEN standard can work. * You indicate empty squares separately, instead of combining a contiguous range and write their number I had corrected my post to change the "--" to a 2. It appears the main decision is to what t...
by MOBMAT
Tue Aug 20, 2019 6:19 pm
Forum: Computer Chess Club: General Topics
Topic: FEN's for other games
Replies: 7
Views: 786

Re: FEN's for other games

I did say (not yet Chess), so pick one. checkers, othello, clobber, breakthrough, GO. anything BUT chess. FEN was designed to provide a solution for chess. I am proposing a similar solution for other games. I never want to believe I'm the first person to think of something, so hence the question. I'...
by MOBMAT
Tue Aug 20, 2019 2:24 pm
Forum: Computer Chess Club: General Topics
Topic: FEN's for other games
Replies: 7
Views: 786

FEN's for other games

I've implemented a number of game engines using MCTS (not yet chess) and I have the need to set up test positions from time to time. Having FEN-like capabilities would be nice, and easy to implement, but I didn't want to reinvent the wheel or create yet another format that might not be in use by oth...
by MOBMAT
Mon Aug 12, 2019 12:58 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Bitboard logic: identifying 4 squares in a block
Replies: 8
Views: 1396

Re: Bitboard logic: identifying 4 squares in a block

Let me elaborate. - - - - - - - - x x - - - - - x x - - - - - - - - - - - - - - - - - - The diagram above shows 4 'on' bits adjacent to each other in the shape of a square. There might be additional bits "touching" these four, the test is, is there ANY 4 bits in this pattern. A square of four can oc...
by MOBMAT
Sun Aug 11, 2019 9:56 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Bitboard logic: identifying 4 squares in a block
Replies: 8
Views: 1396

Bitboard logic: identifying 4 squares in a block

I want to be able to identify a pattern of 4 pieces forming a square anywhere on a board, such as: - - - - - - - - x x - - - - - x x - - - - - - - - - - - - - - - - - - The board could be any size. The pattern can occur anywhere on the board, so, depending on the size of the board, there are a lot o...