Search found 6622 matches

by Uri Blass
Thu Oct 31, 2019 9:51 am
Forum: Computer Chess Club: General Topics
Topic: Tactics cannot be very important for chess
Replies: 90
Views: 5264

Re: Tactics cannot be very important for chess

If one has built a fast-searching engine, one jolly well SHOULD tune it to seek tactical complexity! :P I don't think so. Or, at least, that experiment has been tried. Tuning a chess engine to solve tactical test sets definitely lowers the strength in game play. That's not quite what I meant. I int...
by Uri Blass
Wed Oct 30, 2019 12:22 pm
Forum: Computer Chess Club: General Topics
Topic: Tactics cannot be very important for chess
Replies: 90
Views: 5264

Re: Tactics cannot be very important for chess

Many, many chess games are won with a gradually increasing eval for the winning side. So there really is no tactical moment where the game is won, there is just increasing pressure and eventually conversion into a mate. Carlsen is this type of player, generally: he is just really good at squeezing ...
by Uri Blass
Tue Oct 29, 2019 11:01 pm
Forum: Computer Chess Club: General Topics
Topic: Tactics cannot be very important for chess
Replies: 90
Views: 5264

Re: Tactics cannot be very important for chess

Many, many chess games are won with a gradually increasing eval for the winning side. So there really is no tactical moment where the game is won, there is just increasing pressure and eventually conversion into a mate. Carlsen is this type of player, generally: he is just really good at squeezing ...
by Uri Blass
Sat Oct 26, 2019 9:55 am
Forum: Computer Chess Club: General Topics
Topic: starting to build 50 move rule test suite
Replies: 12
Views: 758

Re: starting to build 50 move rule test suite

[Event "Computer chess game"] [Site "URIBLASS-THINK"] [Date "2019.10.26"] [Round "?"] [White "UriBlass"] [Black "UriBlass"] [Result "*"] [BlackElo "2400"] [Time "12:41:10"] [WhiteElo "2400"] [SetUp "1"] [FEN "5k2/5r2/4Q3/6K1/8/8/8/8 w - - 65 1"] [Termination "unterminated"] [PlyCount "34"] [WhiteTyp...
by Uri Blass
Sat Oct 26, 2019 9:41 am
Forum: Computer Chess Club: General Topics
Topic: starting to build 50 move rule test suite
Replies: 12
Views: 758

Re: starting to build 50 move rule test suite

stockfish is not deterministic and in a second try it finds Qc6 with a mate score FEN: 5k2/5r2/4Q3/6K1/8/8/8/8 w - - 65 1 Stockfish_19102310_x64_modern: 1/1 00:00 167 84k +6.99 1.Kg6 2/2 00:00 444 222k +59.52 1.Qe2 Rf1 3/4 00:00 623 312k +59.52 1.Qe2 Rf1 2.Qxf1+ Ke8 4/5 00:00 1k 561k +59.33 1.Qe2 Ra...
by Uri Blass
Sat Oct 26, 2019 9:38 am
Forum: Computer Chess Club: General Topics
Topic: starting to build 50 move rule test suite
Replies: 12
Views: 758

Re: starting to build 50 move rule test suite

Here is an idea how to continue to build it. look at the syzygy tablebases for position when the best move based on DTM is different from the best move based on DTZ and generate positions like the following 5k2/5r2/4Q3/6K1/8/8/8/8 w - - 65 1 bm Qc6 Qc6 has DTZ=34 DTM=44 so it is winning Other moves ...
by Uri Blass
Fri Oct 25, 2019 10:51 pm
Forum: Computer Chess Club: General Topics
Topic: starting to build 50 move rule test suite
Replies: 12
Views: 758

starting to build 50 move rule test suite

k7/8/K7/8/8/7b/Q7/n7 w - - 98 1 bm Qxa1 This one is easy and stockfish solve it correctly. of course not Qg8+ Bc8+ draw by the 50 move rule and white has no time to capture with mate. some free versions of komodo fail(did not try the last free version or the commercial version) 7k/8/7K/N7/3N4/8/B7/...
by Uri Blass
Fri Oct 25, 2019 10:07 pm
Forum: Computer Chess Club: General Topics
Topic: A wrong mate score by stockfish because 50 move rule
Replies: 12
Views: 1206

Re: A wrong mate score by stockfish because 50 move rule

In second try I got bigger depth but no draw score at depth 38 inspite of the fact that 37 plies are enough for a draw by the 50 move rule so I guess that even 101 plies from the root position are not enough for stockfish to see the draw. Here is the analysis from clear hash(I used 1024 mbytes hash ...
by Uri Blass
Fri Oct 25, 2019 9:28 pm
Forum: Computer Chess Club: General Topics
Topic: A wrong mate score by stockfish because 50 move rule
Replies: 12
Views: 1206

Re: A wrong mate score by stockfish because 50 move rule

I asked just 2 days ago if SF can see draw by 50 move after 100 plies, but didn't get any answers. Test position 6k1/8/6p1/8/5r2/1Q6/8/6K1 b - - 1 60 For your question I guess stockfish cannot search 100 plies forward or does not see draw score. I do not know but I tried many plies later at move 92...
by Uri Blass
Fri Oct 25, 2019 9:37 am
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 114
Views: 15573

Re: Database snapshot

I think that we need first 100% reliable engine for analysis otherwise we can be sure of nothing. Stockfish is not reliable and it can give mate score for position that is a draw by the 50 move rule. We need an engine that if it say mate it is really a mate and it check carefully that it is not a dr...