Author: Shaun Brewer
Date: 03:51:07 09/10/02
I have just discovered that my tests between these two engine versions are
invalid.
Crafty 17.10 only chooses the highest ranked opening book move see below:
Crafty 17.10: see moves considered
White(1): go
clearing hash tables
after screening, the following moves can be played
move played % score learn CAP sortv P% P
e4! 271451 43 0.15 0.01 -655.36 13077.0 40 Y
d4! 223430 35 0.15 0.00 -655.36 12896.1 30 Y
f4! 1491 0 -0.05 0.00 -655.36 12038.5 30 Y
Nf3 65893 10 -0.02 0.00 -655.36 4281.7 0 Y
c4 48639 7 -0.17 0.00 -655.36 4188.2 0 Y
d3? 203 0 0.13 0.00 -655.36 69.7 0 N
e3? 155 0 0.13 0.00 -655.36 69.6 0 N
Nc3? 860 0 -0.02 0.00 -655.36 42.2 0 N
f3? 6 0 -0.07 0.00 -655.36 29.0 0 N
g3? 6183 0 -0.21 0.00 -655.36 23.8 0 N
Nh3? 5 0 -0.12 0.00 -655.36 19.0 0 N
Na3? 5 0 -0.12 0.00 -655.36 19.0 0 N
b3? 2264 0 -0.21 0.00 -655.36 9.3 0 N
c3? 103 0 -0.19 0.00 -655.36 5.4 0 N
h4? 6 0 -0.19 0.00 -655.36 5.0 0 N
b4? 429 0 -0.20 0.00 -655.36 4.6 0 N
a3? 111 0 -0.20 0.00 -655.36 3.4 0 N
h3? 75 0 -0.20 0.00 -655.36 3.3 0 N
book moves {e4, d4, f4}
moves considered {e4}
move played % score sortv P% P
e4! 271451 43 0.15 666.7 40 Y
book 0.0s 43% e4! c5
Crafty 18.15: for comparison
White(1): go
clearing hash tables
after screening, the following moves can be played
move played % score learn CAP sortv P% P
e4! 271451 43 0.49 0.00 -655.36 12581.0 40 Y
d4! 223430 35 0.49 0.00 -655.36 12492.5 30 Y
f4! 1491 0 0.21 0.00 -655.36 12027.7 30 Y
Nf3 65893 10 0.35 0.00 -655.36 4174.4 0 Y
c4 48639 7 0.09 0.00 -655.36 4090.6 0 Y
d3? 203 0 0.46 0.00 -655.36 75.4 0 N
e3? 155 0 0.46 0.00 -655.36 75.3 0 N
Nc3? 860 0 0.35 0.00 -655.36 54.6 0 N
Nh3? 5 0 0.25 0.00 -655.36 33.0 0 N
Na3? 5 0 0.25 0.00 -655.36 33.0 0 N
f3? 6 0 0.18 0.00 -655.36 19.0 0 N
g3? 6183 0 0.07 0.00 -655.36 8.4 0 N
b4? 429 0 0.10 0.00 -655.36 3.8 0 N
b3? 2264 0 0.07 0.00 -655.36 1.2 0 N
h4? 6 0 0.09 0.00 -655.36 1.0 0 N
a3? 111 0 0.06 0.00 -655.36 -4.8 0 N
c3? 103 0 0.06 0.00 -655.36 -4.8 0 N
h3? 75 0 0.06 0.00 -655.36 -4.9 0 N
book moves {e4, d4, f4}
moves considered {e4, d4, f4}
move played % score sortv P% P
e4! 271451 43 0.49 40000.0 40 Y
d4! 223430 35 0.49 30000.0 30 Y
f4! 1491 0 0.21 30000.0 30 Y
book 0.0s 43% e4! c5
Oh well a couple of thousand games has proved that 17.10 with a narrower book
choice is better than 18.15 not really what I was trying to test.
Shaun
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