Author: Mike Byrne
Date: 14:49:20 05/30/03
Go up one level in this thread
On May 30, 2003 at 08:57:45, Jorge Pichard wrote:
>With White to move Ruffian selected Bf2? against Aristarch 4.21 and now the
>knight can escape easy.
>
>[D]8/8/8/4B1k1/4K3/8/4B1n1/8 w - -
Bf2? --not possible ,maybe Bf1 and there is no escape
White(1): Bf1
time used: 2:11
end-game phase
clearing hash tables
time surplus 0.00 time limit 22.50 (3:30)
depth time score variation (1)
starting thread 1
2 0.00 Mat16 1. ... Ne1 <EGTB>
2 0.00 Mat36 1. ... Nh4 <EGTB>
2-> 0.04 Mat36 1. ... Nh4 <EGTB>
3 0.04 Mat36 1. ... Nh4 <EGTB>
3-> 0.04 Mat36 1. ... Nh4 <EGTB>
4 0.04 Mat36 1. ... Nh4 <EGTB>
4-> 0.04 Mat36 1. ... Nh4 <EGTB>
time=0.04 cpu=75% mat=3 n=72 fh=100% nps=10k
ext-> chk=0 cap=0 pp=0 1rep=0 mate=0
predicted=0 nodes=72 evals=1
endgame tablebase-> probes done=9 successful=9
SMP-> split=3 stop=0 data=2/32 cpu=0.03 elap=0.04
mated in 36 moves.
kibitz mated in 36 moves.
if Bg7 , it' still mate - just takes longer
White(1): Bg7
time used: 3:54
time surplus 0.00 time limit 22.49 (3:29)
depth time score variation (1)
2 0.00 Mat35 1. ... Nh4 <EGTB>
2 0.00 Mat42 1. ... Nf4 <EGTB>
2-> 0.00 Mat42 1. ... Nf4 <EGTB>
3 0.00 Mat42 1. ... Nf4 <EGTB>
3-> 0.00 Mat42 1. ... Nf4 <EGTB>
4 0.00 Mat42 1. ... Nf4 <EGTB>
4-> 0.01 Mat42 1. ... Nf4 <EGTB>
time=0.01 cpu=0% mat=3 n=40 fh=100% nps=10k
ext-> chk=0 cap=0 pp=0 1rep=0 mate=0
predicted=0 nodes=40 evals=1
endgame tablebase-> probes done=6 successful=6
SMP-> split=4 stop=0 data=2/32 cpu=0.00 elap=0.01
mated in 42 moves.
kibitz mated in 42 moves.
Many of the modern programs that do not have EGTB will not play this correctly,
as the programmer lets the EGTB so the work for it. A program such as Crafty,
which has large portion of code written before EGTB will play an ending like
this correctly with EGTB
analysis w/o egtb 4.7 seconds to see optimal move Bc7
Crafty v19.3 (2 cpus)
White(1): 8/8/8/4B1k1/4K3/8/4B1n1/8 w - -
White(1):
White(1): st 9999
search time set to 9999.00.
White(1): go
end-game phase
clearing hash tables
time surplus 0.00 time limit 166:39 (166:39)
depth time score variation (1)
starting thread 1
4 0.02 1.26 1. Bh8 Ne1 2. Bg7 Nc2
4-> 0.02 1.26 1. Bh8 Ne1 2. Bg7 Nc2
5 0.02 1.26 1. Bh8 Ne1 2. Bg7 Nc2 3. Ba6
5-> 0.02 1.26 1. Bh8 Ne1 2. Bg7 Nc2 3. Ba6
6 0.02 1.26 1. Bh8 Ne1 2. Bg7 Nc2 3. Ba6 Kg4
6-> 0.03 1.26 1. Bh8 Ne1 2. Bg7 Nc2 3. Ba6 Kg4
7 0.03 1.26 1. Bh8 Nf4 2. Ba6 Ng2 3. Ke5 Ne1 4.
Be2
7-> 0.05 1.26 1. Bh8 Nf4 2. Ba6 Ng2 3. Ke5 Ne1 4.
Be2
8 0.05 1.26 1. Bh8 Nf4 2. Ba6 Ng2 3. Ke5 Nf4 4.
Bf6+ Kg4 5. Bc4
8 0.05 1.28 1. Bf1 Nh4 2. Bc7 Ng6 3. Bd8+ Kg4 4.
Be2+ Kg3 5. Bf3 Kf2
8-> 0.08 1.28 1. Bf1 Nh4 2. Bc7 Ng6 3. Bd8+ Kg4 4.
Be2+ Kg3 5. Bf3 Kf2 (s=3)
9 0.08 1.28 1. Bf1 Nh4 2. Bc7 Ng6 3. Bd8+ Kg4 4.
Be2+ Kg3 5. Bf3 Kf2 6. Bg4 (s=2)
9-> 0.13 1.28 1. Bf1 Nh4 2. Bc7 Ng6 3. Bd8+ Kg4 4.
Be2+ Kg3 5. Bf3 Kf2 6. Bg4 (s=16)
10 0.14 1.28 1. Bf1 Nh4 2. Bc7 Ng6 3. Bd8+ Kg4 4.
Be2+ Kg3 5. Bf3 Kf2 6. Bg4 Kg3 (s=15)
10-> 0.35 1.28 1. Bf1 Nh4 2. Bc7 Ng6 3. Bd8+ Kg4 4.
Be2+ Kg3 5. Bf3 Kf2 6. Bg4 Kg3 (s=16)
11 0.39 1.28 1. Bf1 Nh4 2. Bc7 Kg6 3. Bd8 Nf5 4.
Bd3 Nh6 5. Ke5+ Kf7 6. Be2 Kg6 (s=15)
11-> 0.80 1.28 1. Bf1 Nh4 2. Bc7 Kg6 3. Bd8 Nf5 4.
Bd3 Nh6 5. Ke5+ Kf7 6. Be2 Kg6 (s=9)
12 0.89 1.28 1. Bf1 Nh4 2. Bc7 Kg6 3. Bd8 Nf5 4.
Bd3 <HT> (s=8)
12-> 2.25 1.28 1. Bf1 Nh4 2. Bc7 Kg6 3. Bd8 Nf5 4.
Bd3 Nh6 <HT> (s=11)
13 2.47 1.28 1. Bf1 Nh4 2. Bc7 Kg6 3. Bd8 Nf5 4.
Bd3 Nh6 5. Be7 Kg7 6. Ke5 Kf7 7. Bd8
(s=10)
13 4.67 ++ 1. Bc7!!
13-> 6.63 1.67 1. Bc7
14 7.44 ++ 1. Bc7!!
14 8.66 7.90 1. Bc7 Kh6 2. Bd8 Ne1 3. Ba5 Ng2 4.
Bd2+ Kg6 5. Kf3 Nh4+ 6. Kg4 Kf7 7.
Kxh4 Ke6 8. Bc4+ Kd6 9. Kg5
14-> 13.60 7.90 1. Bc7 Kh6 2. Bd8 Ne1 3. Ba5 Ng2 4.
Bd2+ Kg6 5. Kf3 Nh4+ 6. Kg4 Kf7 7.
Kxh4 Ke6 8. Bc4+ Kd6 9. Kg5 (s=5)
15 16.78 7.90 1. Bc7 Kh6 2. Bd8 Ne1 3. Ba5 Ng2 4.
Bd2+ Kg6 5. Kf3 Kf5 6. Kxg2 Ke4 7.
Bf1 Kd4 8. Kf3 Kc5 (s=4)
? 15 29.27 26/26* 1. Bh5
White(1): ?
time=29.52 cpu=196% mat=3 n=62496043 fh=93% nps=2117k
ext-> chk=2845908 cap=51497 pp=0 1rep=16098 mate=977
predicted=0 nodes=62496043 evals=1
endgame tablebase-> probes done=0 successful=0
SMP-> split=1399 stop=111 data=7/32 cpu=57.90 elap=29.52
White(1): Bc7
time used: 29.52
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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