Michael Sherwin wrote:Uri Blass wrote:<snipped>
bob wrote:
for 10 seconds, with null gets 16 plies in a test position, without gets 8. You can test this by using "sel=0/0" as a command to turn null-move off in Crafty...
for a 10 second limit, with null=16 plies, without = 8.
I agree that the difference is more than one ply but
16 plies against 8 plies seem to me too big difference.
I wonder if you use the same late move reductions in both versions.
Uri
Bob just gave the results for one extreem example to show that there are positions that benifit hugely from the null move huristic. He was not indicating an average expectation.
wasn't extreme at all. Here's an opening position searched for 20 seconds:
If you have a favorite position for me to run, post it, or you can do it yourself using the "sel=0/0" command to turn null move off...
15 9.58 0.32 1. e4 e6 2. Nf3 Nc6 3. d4 Nf6 4. Bd3
Bb4+ 5. c3 Be7 6. O-O O-O 7. e5 Nd5
8. Qc2 f5
15-> 10.39 0.32 1. e4 e6 2. Nf3 Nc6 3. d4 Nf6 4. Bd3
Bb4+ 5. c3 Be7 6. O-O O-O 7. e5 Nd5
8. Qc2 f5
time=20.20 mat=0 n=32392436 fh=89% nps=1.6M
9 9.13 0.20 1. e4 Nc6 2. d4 Nf6 3. d5 Ne5 4. Nf3
d6 5. Nxe5 dxe5
9-> 11.59 0.20 1. e4 Nc6 2. d4 Nf6 3. d5 Ne5 4. Nf3
d6 5. Nxe5 dxe5
time=20.33 mat=0 n=27355629 fh=84% nps=1.3M
So 9 plies to 15 plies in the same time, from the initial opening position...