Author: Dann Corbit
Date: 10:04:34 03/10/00
Go up one level in this thread
Quite likely, there is a much shorter mate. For instance, consider this
position:
7k/p7/1R5K/6r1/6p1/6P1/8/8 w - - acd 21; acn -1428786731; acs 7201; bm Rb7; ce
32746; dm 11; pv Rb7 Rh5+ Kxh5 Kg8 Rxa7 Kf8 Kxg4;
Here is the crafty log for that position:
pondering enabled.
EGTB cache memory = 6M bytes.
hash table memory = 24M bytes.
pawn hash table memory = 8M bytes.
play best book line after search.
EGTB access enabled
using tbpath=./TB
4 piece tablebase files found
1302kb of RAM used for TB indices and decompression tables
PFGA: EPD record: 1
end-game phase
clearing hash tables
time surplus 0.00 time limit 120:00 (120:00)
nss depth time score variation (1)
White(1): exit
10-> 0.52 6.13 1. Rb7 Rb5 2. Rxb5 Kg8 3. Kg5 Kf8 4.
Kxg4 Ke7 5. Ra5 Ke6 6. Rxa7
11 0.87 6.13 1. Rb7 Rb5 2. Rxb5 Kg8 3. Ra5 Kf7 4.
Rxa7+ Kf6 5. Ra5 Ke7 6. Kh5 Ke6 7.
Kxg4
11-> 0.95 6.13 1. Rb7 Rb5 2. Rxb5 Kg8 3. Ra5 Kf7 4.
Rxa7+ Kf6 5. Ra5 Ke7 6. Kh5 Ke6 7.
Kxg4
12 1.11 ++ 1. Rb7!!
12 2.85 Mat17 1. Rb7 Rb5 2. Rxb5 Kg8 3. Kh5 Kf7 4.
Kxg4 a6 5. Ra5 Ke6 6. Rxa6+ <HT>
12-> 3.25 Mat17 1. Rb7 Rb5 2. Rxb5 Kg8 3. Kh5 Kf7 4.
Kxg4 a6 5. Ra5 Ke6 6. Rxa6+ <HT>
13 5.46 Mat16 1. Rb7 Rb5 2. Rxb5 Kg8 3. Rf5 a5 4.
Rxa5 Kf8 5. Kh5 Ke7 6. Kxg4 <HT>
13-> 5.97 Mat16 1. Rb7 Rb5 2. Rxb5 Kg8 3. Rf5 a5 4.
Rxa5 Kf8 5. Kh5 Ke7 6. Kxg4 <HT>
14 9.07 Mat16 1. Rb7 Rb5 2. Rxb5 Kg8 3. Rf5 a5 4.
Rxa5 Kf7 5. Kh5 Ke6 6. Kxg4 <HT>
14-> 10.71 Mat16 1. Rb7 Rb5 2. Rxb5 Kg8 3. Rf5 a5 4.
Rxa5 Kf7 5. Kh5 Ke6 6. Kxg4 <HT>
15 16.80 Mat16 1. Rb7 Rb5 2. Rxb5 Kg8 3. Rf5 a5 4.
Rxa5 Kf7 5. Kh5 Ke6 6. Kxg4 <HT>
15-> 19.95 Mat16 1. Rb7 Rb5 2. Rxb5 Kg8 3. Rf5 a5 4.
Rxa5 Kf7 5. Kh5 Ke6 6. Kxg4 <HT>
16 2:01 Mat11 1. Rb7 Kg8 2. Kxg5 Kf8 3. Rxa7 Ke8
4. Kxg4 <HT>
16-> 2:09 Mat11 1. Rb7 Kg8 2. Kxg5 Kf8 3. Rxa7 Ke8
4. Kxg4 <HT>
17 2:47 Mat11 1. Rb7 Kg8 2. Kxg5 Kf8 3. Rxa7 Ke8
4. Kxg4 <HT>
17-> 3:05 Mat11 1. Rb7 Kg8 2. Kxg5 Kf8 3. Rxa7 Ke8
4. Kxg4 <HT>
18 4:39 Mat11 1. Rb7 Kg8 2. Kxg5 Kf8 3. Rxa7 Ke8
4. Kxg4 <HT>
18-> 5:28 Mat11 1. Rb7 Kg8 2. Kxg5 Kf8 3. Rxa7 Ke8
4. Kxg4 <HT>
19 34:28 Mat11 1. Rb7 Rh5+ 2. Kxh5 Kg8 3. Rxa7 Kf8
4. Kxg4 <HT>
19-> 38:31 Mat11 1. Rb7 Rh5+ 2. Kxh5 Kg8 3. Rxa7 Kf8
4. Kxg4 <HT>
20 73:53 Mat11 1. Rb7 Rh5+ 2. Kxh5 Kg8 3. Rxa7 Kf8
4. Kxg4 <HT>
20-> 90:52 Mat11 1. Rb7 Rh5+ 2. Kxh5 Kg8 3. Rxa7 Kf8
4. Kxg4 <HT>
time=120:00 cpu=99% mat=-1 n=2866180565 fh=9% nps=398050
ext-> checks=211010966 recaps=115979 pawns=8831516 1rep=2488116
thrt:234620
predicted=0 nodes=2866180565 evals=3620731
endgame tablebase-> probes done=252522 successful=252492
Notice that it first saw mate in 17, then 16, then 11.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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