Author: Inmann Werner
Date: 01:35:00 09/10/99
Go up one level in this thread
On September 10, 1999 at 01:53:47, Steffen Jakob wrote: >Hi Bob! > >The position I gave you comes from a blitz game which Hossa played at ICC (I >think it was against Occam). Hossa is rather weak in endgames and therefore I >decided to concentrate on this position for a long time to find out how I can >improve the search and evaluation in such endgames. I started to work on this >position about 3 weeks ago and found many many bugs in Hossa (which >unfortunately still are not all fixed). Positions which are "trivial" for humans >can be difficult for comps! > >On September 10, 1999 at 00:19:37, Robert Hyatt wrote: > >>Here is an interesting position given to me by Steffen Jakob: >> >> /p/P5p/7p/7P/4kpK/// w >> >> +---+---+---+---+---+---+---+---+ >> 8 | | | | | | | | | >> +---+---+---+---+---+---+---+---+ >> 7 | *P| | | | | | | | >> +---+---+---+---+---+---+---+---+ >> 6 | P | | | | | | *P| | >> +---+---+---+---+---+---+---+---+ >> 5 | | | | | | | | *P| >> +---+---+---+---+---+---+---+---+ >> 4 | | | | | | | | P | >> +---+---+---+---+---+---+---+---+ >> 3 | | | | | *K| *P| K | | >> +---+---+---+---+---+---+---+---+ >> 2 | | | | | | | | | >> +---+---+---+---+---+---+---+---+ >> 1 | | | | | | | | | >> +---+---+---+---+---+---+---+---+ >> a b c d e f g h >> >> >>Obviously black is getting crushed. He has one move, Kh3, which leads to a >>mate in 6. Steffen asked me to try this and Crafty found a mate in 4, which > >>You ought to find the following variation as one mate in 6: >> >>Kh3, f2, Kg2, Ke2, Kg3, f1=Q, Kh2, g5, hg, Kf3, g6, Qg2# > >There are other lines: > >1.Kh2 f2 2.Kg2 Ke2 3.Kh1 f1Q+ 4.Kh2 g5 5.Kg3 Qf2+ 6.Kh3 g4# > >Your program also has to see this line with an underpromotion: > >1.Kh3 f2 2.Kg2 Ke2 3.Kh3 Kf3 4.Kh2 f1R! 5.Kh3 Rh1# > > >Greetings, >Steffen. Hello Steffen :) A real "nice" position. Inmichess seems as dumb as.... First a Mate in 7, then on blacks move, it gets right. Needs also 13 plys to find a mate. Also Inmichess loves G3-H2, you know my ugly endgame evaluation :( Will try it with 2.18 in the evening, maybe my new extensions help a little to find earlier? As we said, hashing is a complicate thing...... greetings to Vienna Werner Inmichess 2.17b 5 -1264 0.0 676 G3-H2 E3-E2 H2-G3 6 -1264 0.0 961 G3-H2 E3-E2 7 -1297 0.0 3331 G3-H2 E3-E2 H2-G3 F3-F2 G3-F4 F2-F1 F4-G5 F1-5 G5-H6 8 -1328 0.0 5789 G3-H2 9 -1400 0.0 14168 G3-H2 10 -1485 0.0 45695 G3-H2 E3-E2 H2-G3 F3-F2 G3-F4 F2-F1 F4-E5 E2-E3 E5-E6 F1-C4 E6-D6 C4*H4 11 -1916 1.0 164830 G3-H2 F3-F2 H2-G2 E3-E2 G2-G3 F2-F1 G3-H2 F1-F2 H2-H3 F2-F1 12 -1617 2.0 359265 G3-H2 F3-F2 13 -31985 6.0 921084 G3-H2 F3-F2 H2-G2 E3-E2 G2-G3 F2-F1 G3-H2 F1-F4 H2-H3 F4-G4 H3-H2 E2-F1 H2-H1 G4*H4 H1-H2 14 -31985 15.0 2251435 G3-H2 F3-F2 H2-G2 E3-E2 G2-G3 F2-F1 G3-H2 F1-F4 H2-H3 F4-G4 H3-H2 E2-F1 H2-H1 G4*H4 H1-H2 15 -31985 38.0 5612851 G3-H2 F3-F2 H2-G2 E3-E2 G2-G3 F2-F1 G3-H2 F1-F4 H2-H3 F4-G4 H3-H2 E2-F1 H2-H1 G4*H4 H1-H2 ** Zug: 1 Wert: Mate in 7 (15) Zeit: 56 sec Knoten: 9091209 Rest:0 G3-H2 F3-F2 H2-G2 E3-E2 G2-G3 F2-F1 G3-H2 F1-F4 H2-H3 F4-G4 H3-H2 E2-F1 H2-H1 G4*H4 H1-H2 SP 5 1400 0.0 263 E3-E2 H2-G3 6 1508 0.0 338 E3-E2 H2-G3 7 1487 0.0 504 E3-E2 H2-G3 F3-F2 G3-F4 F2-F1 F4-E5 E2-E3 8 1487 0.0 987 E3-E2 H2-G3 9 1516 0.0 2611 E3-E2 H2-G3 10 1583 0.0 33951 E3-E2 H2-G3 F3-F2 G3-F4 F2-F1 F4-E5 E2-D2 E5-D6 F1-F4 10 31988 0.0 78358 F3-F2 H2-G2 E3-E2 G2-G3 F2-F1 G3-H2 G6-G5 H2-G3 F1-F2 G3-H3 G5-G4 H3*G4 ** Zug: 1 Wert: Mate in 5 (10) Zeit: 0 sec Knoten: 84369 Rest:0 F3-F2 H2-G2 E3-E2 G2-G3 F2-F1 G3-H2 G6-G5 H2-G3 F1-F2 G3-H3 G5-G4 H3*G4 Q
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