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Subject: Re: Opposite Color Bishop Ending

Author: Dann Corbit

Date: 15:17:42 11/29/99

Go up one level in this thread


On November 29, 1999 at 17:01:49, Howard Exner wrote:

>5k2/7K/3P3P/8/3bB3/8/8/8 b - - id Rebel Century - Junior 6.0ss; bm d4e5;
>
>This position occurred in the recent tournament in Germany. Here Junior played
>Ke8 and Rebel eventually won. Can the game be saved with the move Be5?
>eg: 1. ... Be5 2.d7 Bc7. Are endgame table bases needed for this?

With 4 piece tablebase files, crafty still wants Bc5 after 24 plies, but it is
not a glowing endorsement at -3.17.  Maybe it is some kind of zugzwang.  I will
make the move Be5 and see what crafty thinks the chances are for white.

EPD Kit revision date: 1996.04.21
unable to open book file [e:/crafty/release/book.bin].
book is disabled
unable to open book file [e:/crafty/release/books.bin].
search time set to 8000.00.
using cpu time
Crafty 17.2 vs ferret
pondering enabled.
EGTB cache memory = 16M bytes.
hash table memory = 48M bytes.
pawn hash table memory = 8M bytes.
play best book line after search.
EGTB access enabled
using tbpath=e:/crafty/release/tb,F:/KBP
4 piece tablebase files found
1302kb of RAM used for TB indices and decompression tables


Crafty v17.2

White(1): epdpfga epd.epd epd.out
PFGA: EPD record: 1
end-game phase
              clearing hash tables
              time surplus   0.00  time limit 133:20 (133:20)
         nss  depth   time  score   variation (1)
                9     0.84  -2.82   1. ... Kf7 2. Bd5+ Ke8 3. Be6 Be5 4.
                                    d7+ Kd8 5. Kg6 Bb2 6. Bf5 Bd4
                9->   0.90  -2.82   1. ... Kf7 2. Bd5+ Ke8 3. Be6 Be5 4.
                                    d7+ Kd8 5. Kg6 Bb2 6. Bf5 Bd4
               10     1.26  -2.88   1. ... Kf7 2. Bd5+ Ke8 3. Be6 Kf8 4.
                                    d7 Bb6 5. Kg6 Ke7 6. h7 Bd4 7. Kf5
                                    Kd8 8. Ke4
               10     1.93  -2.83   1. ... Bc5 2. d7 Bb6 3. Kg6 Ke7 4.
                                    Bc6 Bd4 5. Kf5 Kd8 6. Kg6 Be5
               10->   1.96  -2.83   1. ... Bc5 2. d7 Bb6 3. Kg6 Ke7 4.
                                    Bc6 Bd4 5. Kf5 Kd8 6. Kg6 Be5
               11     2.35  -3.09   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bb6 7. Bf5
                                    Bc7
               11->   5.46  -3.09   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bb6 7. Bf5
                                    Bc7
               12     6.00  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bf5
                                    Bf6 8. Bg6
               12->   6.22  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bf5
                                    Bf6 8. Bg6
               13     7.17  -3.10   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bf5
                                    Bf6 8. Bg6 Bg5
               13->  10.54  -3.10   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bf5
                                    Bf6 8. Bg6 Bg5
               14    12.03  -3.10   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bf5
                                    Bf6 8. Bg6 Bg5 9. Bf5
               14->  12.93  -3.10   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bf5
                                    Bf6 8. Bg6 Bg5 9. Bf5
               15    16.74  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bd3
                                    Bf6 8. Bf5 Bh4 9. Bg6 Bf6
               15->  17.68  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bd3
                                    Bf6 8. Bf5 Bh4 9. Bg6 Bf6
               16    22.48  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bd3
                                    Bf6 8. Bf5 Bh4 9. Bc2 Bf6 10. Bf5
               16->  23.23  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bd3
                                    Bf6 8. Bf5 Bh4 9. Bc2 Bf6 10. Bf5
               17    31.27  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bd3
                                    Bf6 8. Bf5 Bh4 9. Bc2 Bg5 10. Bg6 Bf6
               17->  32.26  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bd3
                                    Bf6 8. Bf5 Bh4 9. Bc2 Bg5 10. Bg6 Bf6
               18    44.47  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bd3
                                    Bf6 8. Bf5 Bh4 9. Bc2 Bg5 10. Bg6 Bf6
                                    11. Bf5
               18->  45.47  -3.08   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    h7+ Kh8 5. Kf7 Bd8 6. Ke8 Bg5 7. Bd3
                                    Bf6 8. Bf5 Bh4 9. Bc2 Bg5 10. Bg6 Bf6
                                    11. Bf5
               19     1:10  -3.18   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Bb6 6. Ke7 Kh8 7. Ke8
                                    Bc7 8. Bf5 Ba5 9. Ke7 Bb4+ 10. Kd8
                                    Ba5+ 11. Ke8 Kg8 12. Ke7 Bb4+ 13. Ke8
               19->   3:02  -3.18   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Bb6 6. Ke7 Kh8 7. Ke8
                                    Bc7 8. Bf5 Ba5 9. Ke7 Bb4+ 10. Kd8
                                    Ba5+ 11. Ke8 Kg8 12. Ke7 Bb4+ 13. Ke8
               20     3:23  -3.18   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Bb6 6. Ke7 Kh8 7. Ke8
                                    Bc7 8. Bf5 Ba5 9. Ke7 Bb4+ 10. Kf7
                                    Ba5 11. Bg6 Bd8 12. Ke8 Bf6
               20->   3:27  -3.18   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Bb6 6. Ke7 Kh8 7. Ke8
                                    Bc7 8. Bf5 Ba5 9. Ke7 Bb4+ 10. Kf7
                                    Ba5 11. Bg6 Bd8 12. Ke8 Bf6
               21     5:46  -3.16   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Kh8 6. Bf5 Bg5 7. Bg6
                                    Bd8 8. Kf7 Bh4 9. Ke8 Kg8 10. Bf5 Bg5
                                    11. Be4 Bh4 12. Bg6 Bf6
               21->   5:56  -3.16   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Kh8 6. Bf5 Bg5 7. Bg6
                                    Bd8 8. Kf7 Bh4 9. Ke8 Kg8 10. Bf5 Bg5
                                    11. Be4 Bh4 12. Bg6 Bf6
               22     7:59  -3.17   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Kh8 6. Bf5 Bg5 7. Bc2
                                    Kg8 8. Kd5 Bh4 9. Kc6 Kh8 10. Kc7 Kg8
                                    11. Bf5 Bf6 12. Bg6 Be5+ 13. Kc8 Bf6
               22->   8:34  -3.17   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Kh8 6. Bf5 Bg5 7. Bc2
                                    Kg8 8. Kd5 Bh4 9. Kc6 Kh8 10. Kc7 Kg8
                                    11. Bf5 Bf6 12. Bg6 Be5+ 13. Kc8 Bf6
               23    12:43  -3.17   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Kh8 6. Bf5 Bg5 7. Bc2
                                    Kg8 8. Bd3 Bh4 9. Bg6 Kf8 10. Kd6 Bg3+
                                    11. Kd5 Bc7 12. Kc5 Bd8 13. Kc6 Bf6
                                    14. Kc7 <HT>
               23->  13:24  -3.17   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Kh8 6. Bf5 Bg5 7. Bc2
                                    Kg8 8. Bd3 Bh4 9. Bg6 Kf8 10. Kd6 Bg3+
                                    11. Kd5 Bc7 12. Kc5 Bd8 13. Kc6 Bf6
                                    14. Kc7 <HT>
               24    22:04  -3.17   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Kh8 6. Bf5 Bg5 7. Bc2
                                    Kg8 8. Bd3 Bh4 9. Bg6 Kf8 10. Kd6 Bg3+
                                    11. Kc6 Bh4 12. Bf5 Kg8 13. Kc7 Bf6
                                    14. Kc8 Be7
               24->  23:11  -3.17   1. ... Bc5 2. d7 Bb6 3. Kg6 Kg8 4.
                                    Kf6 Bd8+ 5. Ke6 Kh8 6. Bf5 Bg5 7. Bc2
                                    Kg8 8. Bd3 Bh4 9. Bg6 Kf8 10. Kd6 Bg3+
                                    11. Kc6 Bh4 12. Bf5 Kg8 13. Kc7 Bf6
                                    14. Kc8 Be7



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