[d]2b5/1r6/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 b - - bm Rb4;
Here is a demo that shows 20.0 is worth keeping for analysis of closed positions. You will notce at the end that not only has crafty found the correct move but also Alex Szabo's refutation (though the score does not yet reflect this).
Code: Select all
c:\chess\winboard\crafty23>crafty-23.1.exe
EPD Kit revision date: 1996.04.21
found computer opening book file [./bookc.bin].
Initializing multiple threads.
System is SMP, not NUMA.
hash table memory = 1024M bytes.
pawn hash table memory = 64M bytes.
EGTB cache memory = 32M bytes.
choose from book moves randomly (using weights.)
choose from 5 best moves.
book learning enabled
resign after 5 consecutive moves with score < -9.
EGTB access enabled
using tbpath=c:\chess\winboard\Nalimov
6 piece tablebase files found
80229kb of RAM used for TB indices and decompression tables
max threads set to 4.
Crafty v23.1 (4 cpus)
White(1): hash 4096M
hash table memory = 4096M bytes.
White(1): st 999
search time set to 999.00.
White(1): epdpfga \test\wac230.epd wac230.out
PFGA: EPD record: 1 ID: WAC.230
time surplus 0.00 time limit 16:39 (+0.00) (16:39)
depth time score variation (1)
starting thread 1
starting thread 2
starting thread 3
12-> 0.10 -2.56 1. ... a4 2. Kf4 Rh7 3. Ba3 Ba6 4.
Ke3 Rh3+ 5. f3 Rh1 6. Kf4 Rh5 7. Bc5
Rh1
13 0.13 -2.53 1. ... a4 2. Kf4 Rh7 3. f3 Ba6 4. Ba3
Rh5 5. Bf8 Bb5 6. Ba3 Rh4+ 7. Ke3 Rh1
8. Kf4
13-> 0.18 -2.53 1. ... a4 2. Kf4 Rh7 3. f3 Ba6 4. Ba3
Rh5 5. Bf8 Bb5 6. Ba3 Rh4+ 7. Ke3 Rh1
8. Kf4 (s=2)
14 0.32 -2.67 1. ... a4 2. Ba3 Rh7 3. Rd2 Rh1 4.
f4 Rg1+ 5. Kf2 Rb1 6. Kg3 Rf1 7. Rh2
Rd1 8. Bb2 Rd3+ 9. Kg4
14-> 0.36 -2.67 1. ... a4 2. Ba3 Rh7 3. Rd2 Rh1 4.
f4 Rg1+ 5. Kf2 Rb1 6. Kg3 Rf1 7. Rh2
Rd1 8. Bb2 Rd3+ 9. Kg4
15 0.43 -2.64 1. ... a4 2. Ba3 Rh7 3. Rd2 Rh1 4.
f4 Rg1+ 5. Kf2 Rb1 6. Kg3 Rf1 7. Rh2
Rd1 8. Bb2 Rd3+ 9. Kg4 Ba6
15-> 0.54 -2.64 1. ... a4 2. Ba3 Rh7 3. Rd2 Rh1 4.
f4 Rg1+ 5. Kf2 Rb1 6. Kg3 Rf1 7. Rh2
Rd1 8. Bb2 Rd3+ 9. Kg4 Ba6 (s=2)
16 0.66 -2.64 1. ... a4 2. Ba3 Rh7 3. Rd2 Rh1 4.
Kf4 Bb7 5. f3 Ba6 6. Rg2 Bc8 7. Rd2
Ba6 <HT>
16-> 0.78 -2.64 1. ... a4 2. Ba3 Rh7 3. Rd2 Rh1 4.
Kf4 Bb7 5. f3 Ba6 6. Rg2 Bc8 7. Rd2
Ba6 <HT>
17 1.21 -2.71 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Kf4 Rh2 5. Kg3 Rh5 6. Kf4 Rh3 7. Bb2
Rh4+ 8. Ke3 Bb5 9. Ba3 Rh3+ 10. f3
Rh5
17-> 1.50 -2.71 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Kf4 Rh2 5. Kg3 Rh5 6. Kf4 Rh3 7. Bb2
Rh4+ 8. Ke3 Bb5 9. Ba3 Rh3+ 10. f3
Rh5
18 2.16 -2.64 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Kf4 Rh2 5. Kg3 Rh5 6. Kf4 Bc8 7. Bb2
Rh4+ 8. Kg3 Rh8 9. Ra1 Kb5 10. Kf4
Ba6
18-> 2.94 -2.64 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Kf4 Rh2 5. Kg3 Rh5 6. Kf4 Bc8 7. Bb2
Rh4+ 8. Kg3 Rh8 9. Ra1 Kb5 10. Kf4
Ba6 (s=2)
19 4.51 -2.63 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Re1 Bb7 5. f4 Bc8 6. Rb1 Rh8 7. Rf1
Kb5 8. Rf2 Rh1 9. Rh2 Rd1 10. Kg4 Kc6
11. Bb2 Rd3 12. Rh8 Bd7 13. Rh7 Rd2
14. Ba1 <HT>
19-> 5.82 -2.63 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Re1 Bb7 5. f4 Bc8 6. Rb1 Rh8 7. Rf1
Kb5 8. Rf2 Rh1 9. Rh2 Rd1 10. Kg4 Kc6
11. Bb2 Rd3 12. Rh8 Bd7 13. Rh7 Rd2
14. Ba1 <HT>
20 7.80 -2.64 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Re1 Rh5 5. f4 Rh8 6. Kg2 Rb8 7. Bb2
Rf8 8. Ra1 Kb5 9. Kf3 Rh8 10. Ra3 Bb7
11. Ke3 Rh3+ 12. Kd2
20-> 9.04 -2.64 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Re1 Rh5 5. f4 Rh8 6. Kg2 Rb8 7. Bb2
Rf8 8. Ra1 Kb5 9. Kf3 Rh8 10. Ra3 Bb7
11. Ke3 Rh3+ 12. Kd2
21 15.12 -2.65 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Re1 Rh5 5. f4 Rh8 6. Ra1 Bc8 7. Rb1
Bd7 8. Kg2 Ra8 9. Kg3 Rb8 10. Kf3 Rb7
11. Rb2 Rb8 <HT>
21-> 17.79 -2.65 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Re1 Rh5 5. f4 Rh8 6. Ra1 Bc8 7. Rb1
Bd7 8. Kg2 Ra8 9. Kg3 Rb8 10. Kf3 Rb7
11. Rb2 Rb8 12. Rh2 Bc8 13. Bb2 <HT>
22 28.46 -2.61 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. f4 Bb7 6. Rg1 Kb5 7. Re1
Bc6 8. Kg2 Rh4 9. Bc1 Rh7 10. Rh1 Rb7
11. Ba3 Bd7 12. Bb2
22-> 44.08 -2.61 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. f4 Bb7 6. Rg1 Kb5 7. Re1
Bc6 8. Kg2 Rh4 9. Bc1 Rh7 10. Rh1 Rb7
11. Ba3 Bd7 12. Bb2 (s=3)
23 55.99 -2.61 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. f4 Bb7 6. Rg1 Kb5 7. Bc1
Bc6 8. Kg2 Rh7 9. Ba3 Rh4 <HT> (s=2)
23-> 1:03 -2.61 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. f4 Bb7 6. Rg1 Kb5 7. Bc1
Bc6 8. Kg2 Rh7 9. Ba3 Rh4 <HT>
24 1:41 -2.61 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. f4 Bb7 6. Rg1 Ba6 7. Rb1
<HT>
24-> 2:00 -2.61 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. f4 Bb7 6. Rg1 Ba6 7. Rb1
<HT>
25 3:27 -2.44 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. Bc1 Rh8 6. Kg2 Rb8 7. Bb2
Bc8 8. Kf3 Ra8 9. Ba3 Bd7 10. Rh1 Be8
11. Ke3 Ra5 12. f4 Ra6 13. Rh8 Bf7
25-> 7:30 -2.44 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. Bc1 Rh8 6. Kg2 Rb8 7. Bb2
Bc8 8. Kf3 Ra8 9. Ba3 Bd7 10. Rh1 Be8
11. Ke3 Ra5 12. f4 Ra6 13. Rh8 Bf7
(s=4)
26 10:50 -2.45 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. Bc1 Bc8 6. Kg2 Rh7 7. Rh1
Ra7 8. Ba3 Rb7 9. Bb2 Bd7 10. Kg3 Ra7
11. Ba3 <HT> (s=3)
26-> 12:16 -2.45 1. ... a4 2. Ba3 Rh7 3. Rb1 Ba6 4.
Rd1 Rh5 5. Bc1 Bc8 6. Kg2 Rh7 7. Rh1
Ra7 8. Ba3 Rb7 9. Bb2 Bd7 10. Kg3 Ra7
11. Ba3 <HT>
time=16:39 mat=-1 n=12670698327 fh=92% nps=12.7M
extensions=470.0M qchecks=437.2M reduced=2175.2M pruned=3383.5M
predicted=0 evals=387.9M 50move=0 EGTBprobes=1K hits=1K
SMP-> splits=68425 aborts=9981 data=23/65536 elap=16:39
terminating SMP processes.
Black(1):
c:\chess\winboard\crafty>crafty-20.0
Initializing multiple threads.
System is SMP, not NUMA.
EPD Kit revision date: 1996.04.21
found computer opening book file [./bookc.bin].
hash table memory = 192M bytes.
pawn hash table memory = 6M bytes.
EGTB cache memory = 32M bytes.
draw score set to 0.00 pawns.
choose from book moves randomly (using weights.)
choose from 5 best moves.
book learning enabled
result learning enabled
position learning enabled
resign after 5 consecutive moves with score < -9.
6 piece tablebase files found
80229kb of RAM used for TB indices and decompression tables
max threads set to 4
Crafty v20.0 (4 cpus)
White(1): hash 4096M
hash table memory = 3072M bytes.
White(1): st 999
search time set to 999.00.
White(1): epdpfga wac230.epd wac230.out
PFGA: EPD record: 1 ID: WAC.230
time surplus 0.00 time limit 16:39 (16:39)
depth time score variation (1)
starting thread 1
starting thread 2
starting thread 3
12 0.11 +1 1. ... Rh7
12 0.14 0.00 1. ... Rh7 2. Rb1 Rh5 3. Kg4 Bb7 4.
Ba3 Kb5 5. f3 Ka4 6. Bb2 Rh2 7. Ba1
12 0.47 -1.70 1. ... Rb4 2. cxb4 a4 3. Rb1 c3 4.
Rc1 b2 5. Rxc3+ Kd7 6. Rc7+ Kd8 7.
Ra7 b1=Q 8. Rxa4
12-> 0.47 -1.70 1. ... Rb4 2. cxb4 a4 3. Rb1 c3 4.
Rc1 b2 5. Rxc3+ Kd7 6. Rc7+ Kd8 7.
Ra7 b1=Q 8. Rxa4 (s=2)
13 0.65 -2.07 1. ... Rb4 2. cxb4 a4 3. Re2 Kb5 4.
f4 c3 5. Re3 Kc4 6. f5 c2 7. Re1 b2
13-> 0.79 -2.07 1. ... Rb4 2. cxb4 a4 3. Re2 Kb5 4.
f4 c3 5. Re3 Kc4 6. f5 c2 7. Re1 b2
14 0.95 +1 1. ... Rb4
14 1.39 -1 1. ... Rb4!!
14 1.87 -2.47 1. ... Rb4 2. Rb1 Ra4 3. Rc1 Ra2 4.
Kf3 a4 5. Ke3 Kb5 6. f3 Bb7 7. Rb1
Rc2 8. Bb4
14-> 2.09 -2.47 1. ... Rb4 2. Rb1 Ra4 3. Rc1 Ra2 4.
Kf3 a4 5. Ke3 Kb5 6. f3 Bb7 7. Rb1
Rc2 8. Bb4
15 2.49 +1 1. ... Rb4
15 4.05 -2.32 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rc2 bxc2 5. Ba3 c3 6. Kf4 Kc4 7. Ke3
c1=Q+ 8. Bxc1 Kb3 9. Kf4 a3
15-> 4.54 -2.32 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rc2 bxc2 5. Ba3 c3 6. Kf4 Kc4 7. Ke3
c1=Q+ 8. Bxc1 Kb3 9. Kf4 a3
16 5.36 -2.27 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rc2 bxc2 5. Ba3 c3 6. Kf4 Kc4 7. Ke3
c1=Q+ 8. Bxc1 Kb3 9. Kf4 a3 10. Be3
16-> 7.49 -2.27 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rc2 bxc2 5. Ba3 c3 6. Kf4 Kc4 7. Ke3
c1=Q+ 8. Bxc1 Kb3 9. Kf4 a3 10. Be3
(s=3)
17 9.36 -2.34 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rc2 bxc2 5. Ba3 c3 6. Kf4 Kc4 7. Ke3
c1=Q+ 8. Bxc1 Kb3 9. Kf4 a3 10. Be3
Bd7 (s=2)
17-> 11.54 -2.34 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rc2 bxc2 5. Ba3 c3 6. Kf4 Kc4 7. Ke3
c1=Q+ 8. Bxc1 Kb3 9. Kf4 a3 10. Be3
Bd7
18 27.87 -2.46 1. ... Rb4 2. Kf3 Ra4 3. Rb1 Ra2 4.
Rc1 Kb5 5. Ke3 Bd7 6. f3 Bc6 7. Bc5
a4 8. Bd6 Rh2 9. Ba3 Rh5 10. Kf4 <HT>
18-> 32.82 -2.46 1. ... Rb4 2. Kf3 Ra4 3. Rb1 Ra2 4.
Rc1 Kb5 5. Ke3 Bd7 6. f3 Bc6 7. Bc5
a4 8. Bd6 Rh2 9. Ba3 Rh5 10. Kf4 Rh4+
<HT>
19 42.98 -1 1. ... Rb4!!
19 56.49 -3.14 1. ... Rb4 2. Kf3 Ra4 3. Rb1 Ra2 4.
Rc1 Kb5 5. Ke3 a4 6. f3 a3 7. Bc5 Ka4
8. Bd6 Rg2 9. Ra1 a2 10. Kf4 Kb5 <HT>
19-> 1:04 -3.14 1. ... Rb4 2. Kf3 Ra4 3. Rb1 Ra2 4.
Rc1 Kb5 5. Ke3 a4 6. f3 a3 7. Bc5 Ka4
8. Bd6 Rg2 9. Ra1 a2 10. Kf4 Kb5 <HT>
20 1:40 -1 1. ... Rb4!!
20 4:31 -3.75 1. ... Rb4 2. f3 Ra4 3. Rb1 Kb5 4.
Rh1 b2 5. Rb1 Ra2 6. Bc7 Ka4 7. Bxa5
Kxa5 8. Kf4 Ra3 9. Rxb2 Rxc3 10. Rb8
<HT>
20-> 4:57 -3.75 1. ... Rb4 2. f3 Ra4 3. Rb1 Kb5 4.
Rh1 b2 5. Rb1 Ra2 6. Bc7 Ka4 7. Bxa5
Kxa5 8. Kf4 Ra3 9. Rxb2 Rxc3 10. Rb8
<HT>
21 6:16 -4.09 1. ... Rb4 2. f3 Ra4 3. Rb1 Kb5 4.
Rh1 Ra2 5. Bc7 Ba6 6. Bd8 Rc2 7. Be7
Rxc3 8. Rh8 Rd3 9. Rb8+ Ka4 10. Rb6
c3 11. Rxa6 b2 12. Rb6 Rxd4
21-> 7:12 -4.09 1. ... Rb4 2. f3 Ra4 3. Rb1 Kb5 4.
Rh1 Ra2 5. Bc7 Ba6 6. Bd8 Rc2 7. Be7
Rxc3 8. Rh8 Rd3 9. Rb8+ Ka4 10. Rb6
c3 11. Rxa6 b2 12. Rb6 Rxd4
22 11:33 -1 1. ... Rb4!!
22 16:15 -4.50 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Re2 c3 5. Ba3 Kc4 6. f4 Kxd4 7. f5
exf5 8. e6 Kc4 9. Re5 b2 <HT>
time=16:39 mat=-1 n=10542526159 fh=88% nps=10.55M
ext-> chk=416229339 cap=8997515 1rep=17137538 mate=884416
predicted=0 nodes=10542526159 evals=785357816 50move=0
endgame tablebase-> probes=3 hits=0
hashing-> 48%(raw) 47%(depth) 1431655303%(sat) 99%(pawn)
hashing-> 0%(exact) 40%(lower) 2%(upper)
SMP-> split=343670 stop=32596 data=34/32768 elap=16:39
Black(1):
