Author: Dann Corbit
Date: 10:31:53 06/02/00
Go up one level in this thread
On June 02, 2000 at 04:37:15, Paulo Soares wrote:
>On June 01, 2000 at 17:01:13, José de Jesús García Ruvalcaba wrote:
>>On June 01, 2000 at 13:01:25, Vincent Lejeune wrote:
>>>On June 01, 2000 at 11:48:37, José de Jesús García Ruvalcaba wrote:
>>>>On June 01, 2000 at 05:30:31, Vincent Lejeune wrote:
>>>>>On May 31, 2000 at 13:41:45, Dann Corbit wrote:
>>>>>>CAP records (some of them do not appear to have faired well):
>>>>>>6k1/8/2P5/p6p/5bP1/7P/2B2K2/8 w - - acd 20; acn 1174673323; acs 3601; ce
>>>>>>153; pv gxh5 Kg7 Kf3 Bh2 Kg4 Kh6 Bd1 Bc7 Kf5 Bb6 Ke6 Bc7 Kd7 Bf4 Kd8 Be5;
>>>>>
>>>>>I really doubt that gxh5 is the best move because the h's pawn have the wrong
>>>>>square colour to promote, if the black bishop stay on the h2-b8 diagonal with
>>>>>can make no progress.
>>>>>1.g5 seems to be stronger
>>>>
>>>> g5 loses a pawn outright. I agree that gxh5 is a poor move. I think Kf3 is
>>>>better.
>>>>José.
>>>
>>>If 1..Bxg5?, 2.c7! wins a queen ...
>>
>> You are right! This happens to me frequently when I do not set up real board
>>and pieces to analyze.
>> After 1. g5 black must play h4 (otherwise white plays h4, then Bd1 tying
>>black's king to defent the h5 pawn, and then the white king supports the c-pawn
>>and wins). 1. Kf3 attacks the bishop, so white can play g5 the next move.
>> Interesting position, and one in which a little knowledge for opposite-coloured
>>bishop endings is extremely helpful (in this case: when trying to win make both
>>bishops "good", and when trying to draw make both bishops "bad").
>>José.
>
>Strange, I made a long analyse from this position and it seemed
>that 1. g5 and 1. Kg3 are winner moves.
>
On a deep search, all three of gxh5, g5, and Kf3 fare about the same. Here are
the positions *after* each of those choices are made, analyzed for three hours:
[D] 6k1/8/2P5/p6p/5bP1/5K1P/2B5/8 b - - acd 20; acn 2045418075; acs 10002; ce
-171; pv Bc7 gxh5 Kg7 Kg4 Kh6 Ba4 Be5 Bd1 Bh2 Kf5 Bc7 Ke6 Bh2 Kd7 Bf4 Kd8 Bg3
Kd7 Kg5;
[D] 6k1/8/2P5/p6P/5b2/7P/2B2K2/8 b - - acd 21; acn 2022412756; acs 10001; ce
-161; pv Kg7 Kf3 Bc7 Kg4 Kh6 Bd1 Bd8 Kf5 Bc7 Ke6 Bh2 Kd5 Bc7 Kd4 Bb6+ Kc4 Bc7
Bg4 Be5 Kd5 Bg3 Ke6;
[D] 6k1/8/2P5/p5Pp/5b2/7P/2B2K2/8 b - - acd 21; acn 2095662806; acs 10001; ce
-182; pv h4 Kf3 Be5 Kg4 Bg3 Ba4 Kf7 Kh5 Kg7 Bc2 Kg8 Kh6 Bf4 Bb3+ Kh8 Kh5 Bc7
Kxh4 Bd8 Kg4 Bc7;
Naturally, since we are one ply forward, we are looking for the most negative
score. 1/5 of a pawn separates the best from the worst of the three choices.
However, the first and the third positions both had fail lows at the end of
their searchs, so these are probably the best choices.
pondering disabled.
EGTB cache memory = 6M bytes.
hash table memory = 24M bytes.
pawn hash table memory = 8M bytes.
EGTB access enabled
using tbpath=e:/crafty/release/tb,F:/KBP
6 piece tablebase files found
1943kb of RAM used for TB indices and decompression tables
Crafty v17.10
White(1): st 10000
search time set to 10000.00.
White(1): epdpfga epd.epd epd.out
PFGA: EPD record: 1
end-game phase
clearing hash tables
time surplus 0.00 time limit 166:40 (166:40)
nss depth time score variation (1)
11 0.78 -1.46 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Bh2 5. h4 Bc7 6. Bd1 Bh2
11-> 0.98 -1.46 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Bh2 5. h4 Bc7 6. Bd1 Bh2
12 1.04 -- 1. ... Bc7
12 1.93 -1.56 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
h4 Bd8 5. Bb3 Bc7 6. Bd1 <HT>
12-> 2.39 -1.56 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
h4 Bd8 5. Bb3 Bc7 6. Bd1 <HT>
13 7.38 -1.44 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Kf4 Bc7+ 6. Ke4 Bb6 7. Bg4
Bc7 8. h4
13-> 8.68 -1.44 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Kf4 Bc7+ 6. Ke4 Bb6 7. Bg4
Bc7 8. h4
14 9.36 -- 1. ... Bc7
14 16.28 -1.84 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Bd8 4.
Bd1 Bc7 5. Kg5 Bd8+ 6. Kf4 Bc7+ 7.
Kf5 Bd8 8. Ke6 Kh6 9. Kd6
14 41.86 -1.81 1. ... Be5 2. gxh5 Kg7 3. Kg4 Kh6 4.
Bd1 Bc7 5. Kf5 a4 6. Bxa4 Kxh5 7. Ke6
Kh4 8. Kd7
14-> 42.56 -1.81 1. ... Be5 2. gxh5 Kg7 3. Kg4 Kh6 4.
Bd1 Bc7 5. Kf5 a4 6. Bxa4 Kxh5 7. Ke6
Kh4 8. Kd7
15 1:08 -1.84 1. ... Be5 2. gxh5 Kg7 3. Ke4 Bh2 4.
Kd5 Kh6 5. Bd1 a4 6. Bxa4 Kxh5 7. Bd1+
Kh4 8. Bg4 Bc7 9. Bf5
15 1:48 -1.80 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Bd1 Bh2 5. Kf5 a4 6. Bxa4 Kxh5 7. Bd1+
Kh4 <HT>
15-> 1:53 -1.80 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Bd1 Bh2 5. Kf5 a4 6. Bxa4 Kxh5 7. Bd1+
Kh4 <HT>
16 2:50 -1.80 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Be5 5. Bd1 Bh2 6. Kf5 a4 7. Bxa4
Kxh5 <HT>
16-> 3:51 -1.80 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Be5 5. Bd1 Bh2 6. Kf5 a4 7. Bxa4
Kxh5 <HT>
17 6:27 -1.78 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Be5 5. Bd1 Bh2 <HT>
17-> 8:08 -1.78 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Be5 5. Bd1 Bh2 6. Ba4 <HT>
18 16:38 -1.73 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Be5 5. Bd1 Bh2 6. Kf5 Bc7 7. Ke6
Bh2 8. Kd5 Kg7 9. Bc2 Kh6 10. Bg6
18-> 21:44 -1.73 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Be5 5. Bd1 Bh2 6. Kf5 Bc7 7. Ke6
Bh2 8. Kd5 Kg7 9. Bc2 Kh6 10. Bg6
19 58:38 -1.71 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Be5 5. Bd1 Bh2 6. Kf5 Bc7 7. Ke6
Bh2 8. Kd7 Bf4 9. Kd8 Bg3 10. Kd7 Kg5
19-> 85:08 -1.71 1. ... Bc7 2. gxh5 Kg7 3. Kg4 Kh6 4.
Ba4 Be5 5. Bd1 Bh2 6. Kf5 Bc7 7. Ke6
Bh2 8. Kd7 Bf4 9. Kd8 Bg3 10. Kd7 Kg5
20 110:51 -- 1. ... Bc7
time=166:40 cpu=100% mat=-1 n=2045418075 fh=9% nps=204535
ext-> checks=249624906 recaps=1915421 pawns=14036655 1rep=24278480
thrt:90215
predicted=0 nodes=2045418075 evals=231086920
endgame tablebase-> probes done=2403985 successful=32940
PFGA: EPD record: 2
time surplus 0.00 time limit 166:40 (166:40)
nss depth time score variation (1)
11 0.50 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bh2 5. Kf5 Bc7 6. Ke6 <HT>
11-> 0.80 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bh2 5. Kf5 Bc7 6. Ke6 <HT>
12 0.95 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bh2 5. Kf5 Bc7 6. Ke6 <HT>
12-> 1.42 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bh2 5. Kf5 Bc7 6. Ke6 <HT>
13 1.78 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bh2 5. Kf5 Bc7 6. Ke6 <HT>
13-> 2.55 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bh2 5. Kf5 Bc7 6. Ke6 <HT>
14 5.14 -1.60 1. ... Kg7 2. Kf3 Bc7 <HT>
14-> 6.40 -1.60 1. ... Kg7 2. Kf3 Bc7 <HT>
15 10.35 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bb3 Kg7 5. Kg5 Bd8+ 6. Kf5 Kh6 7. Bd1
Bc7 8. Ke6 <HT>
15-> 12.62 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bb3 Kg7 5. Kg5 Bd8+ 6. Kf5 Kh6 7. Bd1
Bc7 8. Ke6 <HT>
16 26.71 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bb3 Kg7 5. Kg5 Bd8+ 6. Kf5 Kh6 7. Bd1
Bc7 8. Ke6 <HT>
16-> 32.58 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bb3 Kg7 5. Kg5 Bd8+ 6. Kf5 Kh6 7. Bd1
Bc7 8. Ke6 <HT>
17 1:08 -1.88 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Kf5 a4 6. Bxa4 Kxh5 7. Bd1+
Kh4 8. Bg4 Bc7 9. Ke6 Kg5 10. Kd7
17-> 8:20 -1.88 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Kf5 a4 6. Bxa4 Kxh5 7. Bd1+
Kh4 8. Bg4 Bc7 9. Ke6 Kg5 10. Kd7
18 10:07 -1.79 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Ba4 Bc7 6. Bc2 Bd8 7. Bd1
Bb6 8. Bb3 <HT>
18-> 11:21 -1.79 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Ba4 Bc7 6. Bc2 Bd8 7. Bd1
Bb6 8. Bb3 <HT>
19 17:06 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Ba4 Bc7 6. Bc2 Bd8 7. Bd1
Bb6 8. Kf5 Bc7 9. Kf6 Bg3 <HT>
19-> 19:43 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Ba4 Bc7 6. Bc2 Bd8 7. Bd1
Bb6 8. Kf5 Bc7 9. Kf6 Bg3 <HT>
20 36:04 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Kf5 Bc7 6. Kf6 Bg3 7. Ke6
Bc7 8. Kf5 Bd6 9. Kg4 Kh7 10. Kg5 Kg7
11. Ba4
20-> 50:07 -1.60 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Kf5 Bc7 6. Kf6 Bg3 7. Ke6
Bc7 8. Kf5 Bd6 9. Kg4 Kh7 10. Kg5 Kg7
11. Ba4
21 122:59 -1.61 1. ... Kg7 2. Kf3 Bc7 3. Kg4 Kh6 4.
Bd1 Bd8 5. Kf5 Bc7 6. Ke6 Bh2 7. Kd5
Bc7 8. Kd4 Bb6+ 9. Kc4 Bc7 10. Bg4
Be5 11. Kd5 Bg3 12. Ke6
time=166:40 cpu=100% mat=-2 n=2022412756 fh=3% nps=202231
ext-> checks=97023963 recaps=1009590 pawns=22546688 1rep=2784174
thrt:112256
predicted=0 nodes=2022412756 evals=431137305
endgame tablebase-> probes done=8149776 successful=131257
PFGA: EPD record: 3
time surplus 0.00 time limit 166:40 (166:40)
nss depth time score variation (1)
10 0.62 -1.09 1. ... Kg7 2. g6 Bc7 3. Kf3 Bh2 4.
Ke3 Bc7 5. Kd4 Bb6+ 6. Kd5 Bc7
10-> 0.88 -1.09 1. ... Kg7 2. g6 Bc7 3. Kf3 Bh2 4.
Ke3 Bc7 5. Kd4 Bb6+ 6. Kd5 Bc7
11 1.59 -1.09 1. ... Kg7 2. g6 Bc7 3. Kf3 Bh2 4.
Ke3 Be5 5. Ke4 Bh2 6. Kd5 Bc7
11-> 2.75 -1.09 1. ... Kg7 2. g6 Bc7 3. Kf3 Bh2 4.
Ke3 Be5 5. Ke4 Bh2 6. Kd5 Bc7
12 4.97 -1.11 1. ... Kg7 2. Kf3 Bh2 3. Ke3 Bc7 4.
Kd4 h4 5. Ke3 Bg3 6. Bf5 Bc7 7. g6
12-> 7.68 -1.11 1. ... Kg7 2. Kf3 Bh2 3. Ke3 Bc7 4.
Kd4 h4 5. Ke3 Bg3 6. Bf5 Bc7 7. g6
13 11.51 -1.14 1. ... Kg7 2. Kf3 Bh2 3. Ke3 Bc7 4.
Kd4 h4 5. g6 Kf6 6. Ke3 a4 7. g7 Kxg7
8. Bxa4
13-> 15.90 -1.14 1. ... Kg7 2. Kf3 Bh2 3. Ke3 Bc7 4.
Kd4 h4 5. g6 Kf6 6. Ke3 a4 7. g7 Kxg7
8. Bxa4
14 20.95 -1.14 1. ... Kg7 2. Kf3 Bh2 3. Ke3 Bc7 4.
Kd4 h4 5. g6 Kf6 6. Ke3 a4 7. Bxa4
Kxg6 8. Bb3
14-> 30.60 -1.14 1. ... Kg7 2. Kf3 Bh2 3. Ke3 Bc7 4.
Kd4 h4 5. g6 Kf6 6. Ke3 a4 7. Bxa4
Kxg6 8. Bb3
15 46.04 -1.15 1. ... Kg7 2. Kf3 Bh2 3. Ke3 Bc7 4.
Kd4 h4 5. g6 a4 6. Bxa4 Kxg6 7. Bc2+
Kg5 8. Ke4 Kf6 9. Kd5
15-> 1:07 -1.15 1. ... Kg7 2. Kf3 Bh2 3. Ke3 Bc7 4.
Kd4 h4 5. g6 a4 6. Bxa4 Kxg6 7. Bc2+
Kg5 8. Ke4 Kf6 9. Kd5
16 1:32 -- 1. ... Kg7
16 47:00 -2.02 1. ... Kg7 2. Kf3 Bc7 3. h4 Bb8 4.
Ke4 Kg6 5. Kd5+ Kf7 6. Bd1 Kf8 7. Bxh5
a4 8. g6 Bg3 9. Bd1 a3
16 50:24 ++ 1. ... h4!!
16 50:54 -1.53 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Kf5 Kf7 5. g6+ Kg7 6. Ke6 a4 7. Bxa4
Kxg6 8. Bc2+ Kg5 9. Kd7 Be5 10. Be4
16-> 51:04 -1.53 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Kf5 Kf7 5. g6+ Kg7 6. Ke6 a4 7. Bxa4
Kxg6 8. Bc2+ Kg5 9. Kd7 Be5 10. Be4
17 51:41 -1.60 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Kf5 Kf7 5. g6+ Kg7 6. Ke6 a4 7. Kd7
a3 8. Bb1 a2 9. Bxa2 Kxg6 10. Bb1+
Kg5 11. Be4
17-> 52:52 -1.60 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Kf5 Kf7 5. g6+ Kg7 6. Ke6 a4 7. Kd7
a3 8. Bb1 a2 9. Bxa2 Kxg6 10. Bb1+
Kg5 11. Be4
18 54:44 -1.60 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Kf5 Kf7 5. g6+ Kg7 6. Kg5 Bd6 7. Kxh4
a4 8. Bxa4 Kxg6 9. Bc2+ Kf6 10. Kg4
Bc7 11. Bf5
18-> 58:41 -1.60 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Kf5 Kf7 5. g6+ Kg7 6. Kg5 Bd6 7. Kxh4
a4 8. Bxa4 Kxg6 9. Bc2+ Kf6 10. Kg4
Bc7 11. Bf5
19 65:12 -1.58 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Kf5 Kf7 5. g6+ Kg7 6. Kg5 Bc7 7. Kxh4
a4 8. Bxa4 Kxg6 9. Kg4 Kf6 10. h4 Ke5
11. h5
19-> 74:46 -1.58 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Kf5 Kf7 5. g6+ Kg7 6. Kg5 Bc7 7. Kxh4
a4 8. Bxa4 Kxg6 9. Kg4 Kf6 10. h4 Ke5
11. h5
20 88:26 -1.82 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Ba4 Kf7 5. Kh5 Kg7 6. Bc2 Kg8 7. Kh6
Bf4 8. Bb3+ Kh8 9. Kh5 Bc7 10. Kxh4
Bd8 11. Kg4 Bc7
20-> 125:22 -1.82 1. ... h4 2. Kf3 Be5 3. Kg4 Bg3 4.
Ba4 Kf7 5. Kh5 Kg7 6. Bc2 Kg8 7. Kh6
Bf4 8. Bb3+ Kh8 9. Kh5 Bc7 10. Kxh4
Bd8 11. Kg4 Bc7
21 126:43 -- 1. ... h4
time=166:40 cpu=99% mat=-1 n=2095662806 fh=14% nps=209554
ext-> checks=227510789 recaps=628105 pawns=16403120 1rep=11235336
thrt:96399
predicted=0 nodes=2095662806 evals=169751199
endgame tablebase-> probes done=1356541 successful=9507
Black(1): quit
execution complete.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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