From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Sun, 7 Nov 2010 20:46:33 +0000 (+0100)
Subject: Properly calculate material eval in asymmetric setups
X-Git-Tag: 4.8Q~23
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=e4b687bb7d8818f0a9c5604413fc57844fd112e4;p=fairymax.git

Properly calculate material eval in asymmetric setups

InitGame assumed that Q=0 in the opening position, but with different
armies this needs not be true. Now it is properly calculated. In the
calculation of R it as also no longer assumed that piece 3 is royal, and
spare Kings are accounted for.
---

diff --git a/fairymax.c b/fairymax.c
index be12a63..8d6a125 100644
--- a/fairymax.c
+++ b/fairymax.c
@@ -366,8 +366,10 @@ InitEngine()
 
 InitGame()
 {
- int i,j;
+ int i,j,k=0;
 
+ Side = WHITE; Q=0; O=S;
+ Fifty = 0; R = 0;
  for(i=0;i<16*BH;i++)b[i]=0;
  for(i=0;i<32;i++)pl[i]=0;
  K=BW;W(K--)
@@ -377,10 +379,13 @@ InitGame()
   if(w[oo[K]] == -1)pl[oo[K]]=1;
   L=8;W(L--)b[16*L+K+257]=(K-BW/2)*(K-BW/2)+(L-3.5)*(L-3.5); /* center-pts table   */
  }                                                   /*(in unused half b[])*/
- Side = WHITE; Q=0; O=S;
- Fifty = 0; R = 0;
- for(i=0; i<BW; i++) if(i!=3) R += (w[oo[i]]/FAC) + (w[oo[i+16]]/FAC);
- UnderProm = -1; pl[WHITE] = pl[BLACK] = 2*BW;
+ for(i=0; i<BW; i++) {
+  R += abs(w[oo[i]])/FAC + abs(w[oo[i+16]])/FAC;
+  Q += abs(w[oo[i]]) - abs(w[oo[i+16]]) + w[1] - w[2];
+  if(w[oo[i]] < 0) k = w[oo[i]];
+ }
+ R -= 2*(-k/FAC);
+ UnderProm = -1; pl[WHITE] = pl[BLACK] = 2*BW; 
  pm = !pl[BLACK+7] && pl[BLACK+9] && pl[WHITE+7] ? 2 : 0; // Unlike white, black has no 'Q', so promote to 9, which he does have.
 }