Author: martin fierz
Date: 22:53:43 12/28/03
Go up one level in this thread
On December 28, 2003 at 10:46:11, Robert Hyatt wrote: >On December 28, 2003 at 04:46:07, martin fierz wrote: > >>On December 27, 2003 at 00:51:11, Mike Byrne wrote: >> >>> >>>[d]8/r7/8/5bk1/8/5B2/5RPP/6K1 b - - 0 1 >> >>for all programs that instantly saw the draw in mike's >>position, this may be interesting too (of course only >>without tablebases): white to move and win, a study by >>J. Vancura 1922, which is also on the chessbase site. >> >>[d]8/8/8/8/8/2K4B/5k1P/8 w - - 0 1 >> >>the point is that although black's king is in the >>square of the white pawn, he can never get through >>to the h-file. programs which are too speculative about >>"wrong bishop => draw" might show a draw score before >>they see the win. >> >>cheers >> martin > > >Mine _never_ says draw in this position: nice. as i suspected, this can confuse programs, as the result of ruffian shows - it says draw at shallow depths. you seem to have implemented the wrong bishop thing better than per-ola ;-) cheers martin > depth time score variation (1) > 1 0.00 4.05 1. Bf5 > 1-> 0.02 4.05 1. Bf5 > 2 0.02 3.82 1. Bf5 Ke3 > 2-> 0.02 3.82 1. Bf5 Ke3 > 3 0.02 4.12 1. Bf5 Ke3 2. h4 > 3-> 0.02 4.12 1. Bf5 Ke3 2. h4 > 4 0.02 4.12 1. Bf5 Ke3 2. h4 Kf4 > 4-> 0.03 4.12 1. Bf5 Ke3 2. h4 Kf4 > 5 0.03 4.12 1. Bf5 Ke3 2. h4 Kf4 3. Be6 > 5 0.03 4.24 1. Bd7 Kf3 2. h4 Kf4 3. h5 > 5 0.03 4.39 1. Be6 Ke3 2. h4 Kf4 3. h5 > 5-> 0.03 4.39 1. Be6 Ke3 2. h4 Kf4 3. h5 > 6 0.03 4.39 1. Be6 Ke3 2. h4 Ke4 3. h5 Ke5 > 6-> 0.07 4.39 1. Be6 Ke3 2. h4 Ke4 3. h5 Ke5 > 7 0.07 ++ 1. Be6!! > 7 0.09 5.16 1. Be6 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > 7-> 0.13 5.16 1. Be6 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > 8 0.15 5.26 1. Be6 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 > 8-> 0.23 5.26 1. Be6 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 > 9 0.27 5.46 1. Be6 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 5. Kd4 > 9-> 0.42 5.46 1. Be6 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 5. Kd4 > 10 0.48 5.56 1. Be6 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 5. Bf5 Kf7 > 10 0.65 ++ 1. Bd7!! > 10 0.67 10.46 1. Bd7 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 5. Be8 Ke5 > 10-> 0.70 10.46 1. Bd7 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 5. Be8 Ke5 > 11 0.84 10.21 1. Bd7 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 5. Be8 Ke7 6. h7 Kxe8 7. h8=Q+ > 11-> 1.18 10.21 1. Bd7 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 5. Be8 Ke7 6. h7 Kxe8 7. h8=Q+ > 12 1.36 10.21 1. Bd7 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 5. Be8 Ke7 6. h7 Kxe8 7. h8=Q+ > Kd7 > 12-> 1.84 10.21 1. Bd7 Ke3 2. h4 Ke4 3. h5 Ke5 4. h6 > Kf6 5. Be8 Ke7 6. h7 Kxe8 7. h8=Q+ > Kd7 > > >Etc (with no endgame tables, othnerwise it is instant mate of course): > > clearing hash tables > time surplus 0.00 time limit 1666:39 (1666:39) > depth time score variation (1) > 1 0.00 3.92 1. Bd7 > 1-> 0.00 3.92 1. Bd7 > 2 0.00 ++ 1. Bd7!! > 2 0.00 Mat14 1. Bd7 <EGTB> > 2-> 0.00 Mat14 1. Bd7 <EGTB> > 3 0.00 Mat14 1. Bd7 <EGTB> > 3-> 0.00 Mat14 1. Bd7 <EGTB> > 4 0.00 Mat14 1. Bd7 <EGTB> > 4-> 0.00 Mat14 1. Bd7 <EGTB> > > >Of course in the first position it finds a draw instantly, whether it be >with egtbs or without...
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