Author: Dieter Buerssner
Date: 05:19:30 02/19/04
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On February 19, 2004 at 03:03:53, Tim Foden wrote: >On February 18, 2004 at 10:15:28, Mihaly Szalai wrote: > >>[D]1knB4/8/7p/5R2/7K/8/3r4/7B w - - 0 1 >> >>White has a very nice play here: >>1. Rb5+ Nb6 2. Bxb6! Rh2+ 3. Kg4! Rxh1 4. Bg1+! Kc7 5. Rb1! Kd7 6. Re1 Kc6 7. >>Rd1 >>Kb5 8. Rc1 Ka4 9. Rb1 +- >> >>I wonder how many engines can see this line and how fast. > >The version of Green Light that I ended up with in Graz likes Rb5+ after 28 >seconds. > > 15 27.640 +3.205 31454k Rb5+ Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8 5. > Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9. Rc1 > Ka4 10. Kf4 > >It gets it after 1 minute 20 seconds. It's not quite the same line as above as >it does h5+ earlier than required (this is a transposition though), but >otherwise looks good: > > 17 1:19.85 +4.657 91517k Rb5+ Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8 5. > Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9. Rc1 > Ka4 10. Rb1 h4+ 11. Kg2 Rxg1+ 12. Rxg1 > >I'll have to figure out what allows it to see this when my other versions of >Green Light that are in development do not :) Very impressive! For Yace null move makes a big difference in this pos. If I analyse the position 5 moves into the line, with null move disabled, it sees that black is lost about 6 depths earlier than with null move enabled. Perhaps you changed something about null move? Or about scoring, when the rook is in the corner with practically no mobility (which, when penalized enough could avoid misleading null move fail highs). BTW. Don't you give KRBKR(+Ps) a drawish score in GLC? Or do you somehow see in the eval, that black is in trouble because of his R in the corner? Regards, Dieter
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