Author: Uri Blass
Date: 09:41:16 07/15/04
Go up one level in this thread
On July 15, 2004 at 11:40:47, Tom Likens wrote: >On July 15, 2004 at 06:14:13, Eduard Nemeth wrote: > >Hello Eduard, > >As always, your posts are both entertaining and illustrative. I ran the seven >endgame positions you provided against my engine and got mixed-results, >(quite similar to Jonny). All the positions were run on an Athlon 1800+, in >analysis mode, without tablebases. > >Some comments are interspersed below the diagrams. > >>Position 1 (1...Qxf3 and black wins): >> >>[D]6k1/1b3p2/1p2p1P1/pPp1P3/2P2Q1P/5PKB/8/3q4 b - - 0 1 > >Djinn also likes 1... Qxe1+ for a long time. After roughly 12 minutes it fails >high and switches to 1 ... Qxf3. A failure in my opinion, since it would never >find it at tournament time controls. Do not be so sure It may get ponder time of more than 12 minutes and it can use opteron250 that may help it to find it faster or better hardware in the future. > >>Position 2 ( b5-b4! Once move to win for black): >> >>[D]8/3r4/7P/kp4K1/8/1P6/P7/8 b - - 0 1 > >I really like this position. It's a good position for people as well as >machines. >The ideas are relatively straightforward, but difficult for most engines. Djinn >didn't "understand" it until are I started walking it down the main line. >Very nice. > >>Test 3 (a2-a4! Once move to win for white): >> >>[D]8/8/1ppk4/p4P2/4K3/8/PP6/8 w - - 0 1 > >Djinn doesn't get this, but I believe it should, since I have code that is >supposed to handle these type of cases. I'll have a look tonight when >I get home from work. > >>Test 4 (Only Kxa3 win): >> >>[D]8/8/k7/P7/1K6/n3B3/1P6/8 w - - 0 1 > >It gets this one fairly quickly, with a score similar to Jonny. > >>Position 5. Is this a hard position without TBs? >>1. Bd2! wins, or draw. >> >>[D]8/8/6p1/6Kp/4kP2/8/8/4B3 w - - 0 1 > >Djinn also like 1. Bg3 with a high score +10 similar to Jonny. I'm puzzled >Eduard, are you sure 1. Bg3 isn't a win for white? I'm curious about the >refutation. I am sure. It leads to KQ vs KP position when the pawn is on the h file and it is a draw because queen cannot win against a or h pawn if the king is not close enough(it also cannot win against c or f pawn in the 7th). Uri
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