13行。
思考ルーチンを削っても10行にしかならん・・・。

#include <stdio.h>
int w[4]={1,-1,12,-12},s,d,h[3],b[132];r(int a, int c){int z,i;b[a]|=8;s++;for
(i=0;i<4;i++){z=a+w[i];if(b[z]==0)d++;if(b[z]==c)r(z,c);}b[a]&=3;}v(int a,int
c){int z,i;b[a]=0;for(i=0;i<4;i++){z=a+w[i];if(b[z]==c)v(z,c);}}int t(int u){
int m,e,g,z,i,k;m=e=0;for(z=0;z<132;z++){k=g=0;if(b[z])continue;for(i=0;i<4;i++
){if(b[z+w[i]]==u){d=s=0;r(z+w[i],1);k+=(d==1)*s*300+(d==2)*s*300+(d==3)*s*20;
}if(b[z+w[i]]==0)k+=10;else g++;}if(g==4)continue;if(k>m){m=k;e=z;}}return e;}
char *p="・○● \n";int main(){int c=1,u=2,z,x,y,i;for(i=0;i<132;i++){if((i+1
)%12==0)b[i]=4;else if(i%12==0||i<12||(i+2)%12==0||i>120)b[i]=3;}for(;;){for(i
=0;i<132;i++)printf("%.2s",&p[b[i]*2]);if(c==1){scanf("%d %d",&x,&y);z=y*12+x;
if(b[z]){printf("Err\n");continue;}}else{if((z=t(u))==0){printf("ps\n");break;
}}b[z]=c;for(i=0;i<4;i++){if(b[z+w[i]]==u){d=s=0;r(z+w[i],u);if(d==0){h[c]+=s;
v(z+w[i],u);}}}d=0;r(z,c);if(d==0)break;u=c;c=3-c;}return 0;}