EPR, even better than LMR!

[Daniel Shawul]

I will try to be clearer.
My restriction is to not reduce heavily below 5 plies. So it doesn't directly go to qsearch just by heavy LMR. Null move can take it to qsearch but that is another issue. Your way of limiting the max reduction in a branch is just one way of doing it. You can also use my way of restriction or do one time non-recursive reduction of 4 plies to get the same effect.The 5 plies margin I have at the end is just to avoid horizon effect. Infact other much stronger engines do not use this criteria at all. What i do in psuedo-code

Code: Select all

if(n_moves > 36) {
  depth -= 4;
  if(depth <= 5) depth = 5; //others skip this check
}

regards,
Daniel

[JVMerlino]

I will try to be clearer.
My restriction is to not reduce heavily below 5 plies. So it doesn't directly go to qsearch just by heavy LMR. Null move can take it to qsearch but that is another issue. Your way of limiting the max reduction in a branch is just one way of doing it. You can also use my way of restriction or do one time non-recursive reduction of 4 plies to get the same effect.The 5 plies margin I have at the end is just to avoid horizon effect. Infact other much stronger engines do not use this criteria at all. What i do in psuedo-code

Code: Select all

if(n_moves > 36) {
  depth -= 4;
  if(depth <= 5) depth = 5; //others skip this check
}

Got it. Very sorry to make you explain it twice.

Thanks very much!
jm