Author: Slater Wold
Date: 13:33:23 02/06/04
Go up one level in this thread
On February 06, 2004 at 13:48:48, Jaime Benito de Valle Ruiz wrote:
>This endgame study can be game following the sequence
>
>1.Bd1 g1Q 2.Bxa4 Qc1 3.Bxd7 h5 4.Be8 h4 5.Ba4 Line
>
>[d] 8/3p4/p6p/k2N3B/p7/K6p/PP4pP/8 w - - 0 1
>
>Many engines (Fritz 8, Hiarcs 8, Ruffian 1.01) cannot win this endgame, probably
>due to the well known null-move problem for extreme and rare positions such as
>this.
>
>They just don't find 5. Ba4
You would be correct.
Crafty with nullmove:
20 44.12 0.01 1. Bd1 g1=Q 2. Bxa4 Qc1 3. Bxd7 h5
4. Be8 h4 5. Bd7 Qxb2+ 6. Kxb2
time=1:00 cpu=98% mat=3 n=61620574 fh=91% nps=1.03M
ext-> chk=3019437 cap=44203 pp=136195 1rep=111186 mate=17716
predicted=0 nodes=61620574 evals=14552918
endgame tablebase-> probes=0 hits=0
SMP-> split=0 stop=0 data=0/4096 cpu=58.92 elap=1:00
Crafty without nullmove:
8-> 0.54 -1.13 1. Bd1 g1=Q 2. Bxa4 Qc1 3. Bxd7 h5
4. Bxh3 Kb5
9 0.62 -- 1. Bd1
9 0.70 -1.54 1. Bd1 g1=Q 2. Bxa4 Qc1 3. Bxd7 h5
4. Bxh3 Qg1 5. b4+ Kb5 6. Nc7+ Kc4
9-> 1.45 -1.54 1. Bd1 g1=Q 2. Bxa4 Qc1 3. Bxd7 h5
4. Bxh3 Qg1 5. b4+ Kb5 6. Nc7+ Kc4
10 1.66 -1.48 1. Bd1 g1=Q 2. Bxa4 Qc1 3. Bxd7 h5
4. Bxh3 Qg1 5. b4+ Kb5 6. Nc7+ Kc6
7. Nxa6 Qxh2
10-> 3.86 -1.48 1. Bd1 g1=Q 2. Bxa4 Qc1 3. Bxd7 h5
4. Bxh3 Qg1 5. b4+ Kb5 6. Nc7+ Kc6
7. Nxa6 Qxh2
11 3.93 ++ 1. Bd1!!
11 4.56 2.54 1. Bd1 g1=Q 2. Bxa4 Qc1 3. Bxd7 h5
4. Be8 h4 5. Ba4 Qxb2+ 6. Kxb2 Kxa4
7. Kc3
11-> 11.17 2.54 1. Bd1 g1=Q 2. Bxa4 Qc1 3. Bxd7 h5
4. Be8 h4 5. Ba4 Qxb2+ 6. Kxb2 Kxa4
7. Kc3
12 13.37 2.70 1. Bd1 g1=Q 2. Bxa4 Qc1 3. Bxd7 h5
4. Be8 h4 5. Ba4 Qxb2+ 6. Kxb2 Kxa4
7. Nf4 Kb4 8. Nxh3
time=24.74 cpu=98% mat=3 n=23714284 fh=99% nps=958K
ext-> chk=1472332 cap=70580 pp=237689 1rep=112404 mate=0
predicted=0 nodes=23714284 evals=2111936
endgame tablebase-> probes=0 hits=0
SMP-> split=0 stop=0 data=0/4096 cpu=24.45 elap=24.74
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