Search found 4040 matches

by Ferdy
Tue Jan 05, 2010 3:14 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: The problem with LMR in suprtactical positions.
Replies: 23
Views: 5192

Re: The problem with LMR in suprtactical positions.

In my case I prefer to measure this by search time, not by depth. Can you post your other LMR conditions? Of course you are right, as OliThink with LMR finds the mate quite quickly at SD=11. Here are my LMR conditions, where d = depth, and i = nr. of move. if (nch) ext++; // Check Extension...
by Ferdy
Tue Jan 05, 2010 2:58 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: The problem with LMR in suprtactical positions.
Replies: 23
Views: 5192

Re: The problem with LMR in suprtactical positions.

Hi, here is a fine position that has a mate in 7 with Qxd5: [d]r2qb1nr/pp1n3p/4k1p1/1P1pPpP1/1B3P1P/2R5/3Q4/R3KB2 w - - 0 3 But there is a problem, that in the mate line: d2d5 e6d5 a1d1 d5e4 c3c4 e4f3 d1d3 f3g4 f1e2 g4h4 c4c3 d7e5 d3h3 We have the quiet move R4c3, which isn't nor a capture, neither...
by Ferdy
Mon Jan 04, 2010 4:35 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: SEE Improvement Idea
Replies: 5
Views: 1347

Re: SEE Improvement Idea

In an attempt to improve the SEE used in programs for pruning moves or selecting move order, how about applying material imbalance rules in the SEE? An example. A program might calculate that PxP PxP is an "even" exchange, but if the first side was left with merely a lone Bishop, it could be much w...
by Ferdy
Thu Dec 31, 2009 6:28 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Did people try replacing LMR by pruning
Replies: 12
Views: 2694

Re: Did people try replacing LMR by pruning

Every time that LMR conditions happen you do not change the depth but increase pruning variable by 1 when the pruning variable is simply the number of times when LMR conditions happened during the path(of course you need to reduce it when you take back the last move). Can you simplify or explain fu...
by Ferdy
Thu Dec 31, 2009 6:13 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: YBWC details
Replies: 8
Views: 2494

Re: YBWC details

I've gutted the horrible PVSplit implementation I had in LittleThought and want to put YBWC in its place. However, I'm having problems trying to find a decent description of the algorithm. I've founds bits and pieces but not really enough for me to get my head around all the little intricacies I ru...
by Ferdy
Tue Dec 29, 2009 6:22 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Alchemy
Replies: 16
Views: 1434

Re: Alchemy

Final Standings 1 Deuterium 09.01.26.492 -2655- 211.5/270 2 Gosu 0.16 2486 155.0/270 3 Dirty ACCA 3 2470 149.5/270 4 Glass 1.3 2437 143.5/270 5 Betsy 6.51 Nobook 2459 128.0/270 6 KnightX 1.92 2396 123.0/270 7 Arion 1.7 2427 122.5/270 8 Amateur 2.82 2452 120.5/270 6714.25 9 Eeyore 1.48 2373 114.0/27...
by Ferdy
Sun Dec 27, 2009 3:27 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: The Chemical Brother
Replies: 14
Views: 1261

Re: The Chemical Brother

Interesting that Deuterium is holding its own against some tough opponents. Congrats to Ferdinand for this improved version. Saludos, Carlos I was also surprised about how much stronger Deuterium is. It is currently leading Alfil 8.1.1 in a short match at CCRL 40/40 time controls! :o Well done to F...
by Ferdy
Sun Dec 27, 2009 2:46 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: The Chemical Brother
Replies: 14
Views: 1261

Re: The Chemical Brother

Very impressive. I think one of the keys for the Deuterium strenth lies in the pawn handling, and you know we are talking about chess' soul (no less!). And it provides Deuterium with a beautiful playing style. Mobility of pieces related to pawn positions is probably working here. This is one of the...
by Ferdy
Thu Dec 24, 2009 6:28 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Alchemy
Replies: 16
Views: 1434

Re: Alchemy

I used to test this at 40 moves in 10 sec against 5 regular sparring partners, Yace, Hamsters, Hermann, Garbochess and Greko using cutechess-cli, and I got a rating of 2596, based on yace (ccrl 40/4) 2611 rating as reference. Hi Ferdinand, based on the results I've seen, I'll get Deuterium to play ...
by Ferdy
Thu Dec 24, 2009 5:57 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Alchemy
Replies: 16
Views: 1434

Re: Alchemy

Hello Ferdinand, Deuterium 09.01.26.492 ELO took me by surprise. I'm gonna start another tournament this time with opponents supposedly better than Deuterium, to specify its ELO. You know, the more opponents and the more games, the more accurate. Best wishes. I guess so, adding engines stronger tha...