Author: Robert Hyatt
Date: 16:13:42 02/25/06
Go up one level in this thread
That looks strange to me. Here is Crafty on my 750mhz laptop, giving all depth
outputs:
depth time score variation (1)
1 0.00 -0.60 1. ... Rb7
1-> 0.00 -0.60 1. ... Rb7
2 0.00 -0.42 1. ... Rb7 2. e4
2 0.00 -0.48 1. ... c3 2. bxc3 Rxc3
2-> 0.00 -0.48 1. ... c3 2. bxc3 Rxc3
3 0.01 -0.48 1. ... c3 2. bxc3 Rxc3
3 0.01 -0.72 1. ... Rb7 2. e4 Rg7
3-> 0.01 -0.72 1. ... Rb7 2. e4 Rg7
4 0.01 -0.40 1. ... Rb7 2. e4 fxe4+ 3. Kxe4 Rd7
4 0.01 -1 1. ... c3!!
4 0.02 -1.26 1. ... c3 2. bxc3 Rxc3 3. Ra2
4-> 0.02 -1.26 1. ... c3 2. bxc3 Rxc3 3. Ra2
5 0.02 -1.56 1. ... c3 2. bxc3 Rxc3 3. Ra2 Rc2
5-> 0.02 -1.56 1. ... c3 2. bxc3 Rxc3 3. Ra2 Rc2
6 0.03 -1.49 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3
6-> 0.03 -1.49 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3
7 0.04 -1.51 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4
7-> 0.04 -1.51 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4
8 0.06 -1.58 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3
8-> 0.11 -1.58 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3
9 0.13 -1.58 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3
9-> 0.19 -1.58 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3
10 0.24 -1.58 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3
10-> 0.52 -1.58 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3
11 0.58 -1.58 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3
11-> 1.13 -1.58 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3
12 1.24 -1 1. ... c3!!
12 1.41 -2.10 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3 a3
12-> 2.70 -2.10 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. h4 Rb3 6. Rxd3 Rxd3
7. Kxd3 a3
13 3.22 -1 1. ... c3!!
13 3.55 -2.41 1. ... c3 2. bxc3 Rxc3 3. Rb2 Rxa3
4. Rb6+ Ke7 5. Rb7+ Ke6 6. Rb6+ Kd5
7. Rb7 Kd6 8. Rb4 Kc5 9. Rd4 h6 <HT>
13-> 6.29 -2.41 1. ... c3 2. bxc3 Rxc3 3. Rb2 Rxa3
4. Rb6+ Ke7 5. Rb7+ Ke6 6. Rb6+ Kd5
7. Rb7 Kd6 8. Rb4 Kc5 9. Rd4 h6 <HT>
14 7.95 -2.44 1. ... c3 2. bxc3 Rxc3 3. Rb2 Rxa3
4. Rb6+ Kf7 5. Rb7+ Kg6 6. Rb6+ Kh5
7. Rb7 d2 8. Rxh7+ Kg6 9. Rd7 Ra2 10.
Rd6+ Kg7 11. h4
14-> 15.19 -2.44 1. ... c3 2. bxc3 Rxc3 3. Rb2 Rxa3
4. Rb6+ Kf7 5. Rb7+ Kg6 6. Rb6+ Kh5
7. Rb7 d2 8. Rxh7+ Kg6 9. Rd7 Ra2 10.
Rd6+ Kg7 11. h4
15 19.49 -2.51 1. ... c3 2. bxc3 Rxc3 3. e4 fxe4+
4. Kxe4 Rxa3 5. Rb2 Rb3 6. Rxb3 axb3
7. Kxd3 Kf5 8. Kc3 h6 9. Kxb3 Kxf4
15 40.19 -1 1. ... Rxb2!!
15 42.07 -3 1. ... Rxb2!!
15 47.85 -4.13 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rb6+ Kc5 6. Rb8 c2 7.
Rc8+ Kb5 8. Kg3 d2 <HT>
15-> 54.75 -4.13 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rb6+ Kc5 6. Rb8 c2 7.
Rc8+ Kb5 8. Kg3 d2 <HT>
time=56.42 mat=0 n=20333227 fh=89% nps=360K
ext-> chk=898427 1rep=18873 mate=193
predicted=0 nodes=20333227 evals=11783895 50move=0
endgame tablebase-> probes=0 hits=0
What looks so wrong is that you like Rxb2 at very early depths. Here is the
search output if crafty only considers Rxb2 at the root, no other moves allowed:
depth time score variation (1)
1 0.00 1.86 1. ... Rxb2 2. Rxb2
1-> 0.00 1.86 1. ... Rxb2 2. Rxb2
2 0.01 1.86 1. ... Rxb2 2. Rxb2
2-> 0.01 1.86 1. ... Rxb2 2. Rxb2
3 0.01 -1 1. ... Rxb2!!
3 0.01 0.70 1. ... Rxb2 2. Rxb2 c3
3-> 0.02 0.70 1. ... Rxb2 2. Rxb2 c3
4 0.02 1.00 1. ... Rxb2 2. Rxb2 c3 3. Rb7
4-> 0.02 1.00 1. ... Rxb2 2. Rxb2 c3 3. Rb7
5 0.02 1.00 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Kf7
4. Rb7+ Kg6
5-> 0.02 1.00 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Kf7
4. Rb7+ Kg6
6 0.02 1.18 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Kf7
4. Rb7+ Kg6 5. e4
6-> 0.02 1.18 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Kf7
4. Rb7+ Kg6 5. e4
7 0.02 -1 1. ... Rxb2!!
7 0.04 0.62 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Kg7
4. Rb7+ Kg6 5. e4 c2 <HT>
7-> 0.04 0.62 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Kg7
4. Rb7+ Kg6 5. e4 c2 <HT>
8 0.06 0.68 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Kg7
4. Rb7+ Kg6 5. e4 fxe4+ 6. Kxe4 c2
8-> 0.06 0.68 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Kg7
4. Rb7+ Kg6 5. e4 fxe4+ 6. Kxe4 c2
9 0.13 -1 1. ... Rxb2!!
9 0.16 0.18 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rf7 c2 6. Rf6+ Kd7 7.
Rf7+ Ke6
9-> 0.18 0.18 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rf7 c2 6. Rf6+ Kd7 7.
Rf7+ Ke6
10 0.26 -0.01 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rb6+ Ke7
10-> 0.27 -0.01 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rb6+ Ke7
11 0.38 -0.01 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rb6+ Ke7
11-> 0.39 -0.01 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rb6+ Ke7
12 0.85 -0.01 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rb6+ Ke7
12-> 0.86 -0.01 1. ... Rxb2 2. Rxb2 c3 3. Rb6+ Ke7
4. Rb7+ Kd6 5. Rb6+ Ke7
time=0.88 mat=0 n=242418 fh=95% nps=275K
ext-> chk=12385 1rep=324 mate=0
So early on, Rxb2 looks very bad for black (good for white) until it thinks it
finds a repetition...
So the question has to be, why does your program like Rxb2 so early??? It drops
a rook outright.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.