diff --git a/main b/main
index be6f3afb94aae43b3f4b1e70da19fc5638e8c72a..083231ea6a1c1f8d6af87415c0c1487b22153963 100755
Binary files a/main and b/main differ
diff --git a/solver.c b/solver.c
index 7ce3133df9c5efc6320f6bc780c3d4ffd8b24e2c..73bac59bc6e3f52ca33f4fcc7c2212e1c5c5f3b1 100644
--- a/solver.c
+++ b/solver.c
@@ -1,5 +1,5 @@
 /* solver.c */
-/* Last Change: 2019/07/25 (Thu) 14:39:28. */
+/* Last Change: 2019/07/29 (Mon) 09:32:40. */
 
 #include<stdio.h>
 #include<limits.h>
@@ -151,51 +151,65 @@ short int search_placable(short int blockid){ //calc the cost (sum of Euclidean
 	short int i,j,k,l,index=0;
 	short int place[5][2]; //(relative) place of edge #block_data[blockid][1-4][] (x,y)
 	short int blockw=0,blockh=0;
-	if(block_data[blockid][2][2]==-1){ //if monomino
-		return 1;
-	}
 	/* calc cost */
-	for(k=1;k<=4;k++){
-		place[k][0]=SHRT_MIN;
-		place[k][1]=SHRT_MIN;
-		for(i=0;i<MAXSIZE;i++){
-			for(j=0;j<MAXSIZE;j++)
-				if(board_beta[i][j]>0 && board_beta[i][j]==block_data[blockid][k][2]){
-					place[k][0]=i-block_data[blockid][k][0];
-					place[k][1]=j-block_data[blockid][k][1];
+	if(block_data[blockid][2][2]==-1){ //if monomino
+		for(i=0;i<MAXSIZE;i++)
+			for(j=0;j<MAXSIZE;j++){
+				cost[i][j][0]=0;
+				if(board_beta[i][j]==block_data[blockid][1][2]){
+					if(i+1<MAXSIZE&&board_beta[i+1][j]==0)
+						cost[i+1][j][0]=1;
+					if(j+1<MAXSIZE&&board_beta[i][j+1]==0)
+						cost[i][j+1][0]=1;
+					if(i-1>=0&&board_beta[i-1][j]==0)
+						cost[i-1][j][0]=1;
+					if(j-1>=0&&board_beta[i][j-1]==0)
+						cost[i][j-1][0]=1;
 				}
+			}
+	}else{
+		for(k=1;k<=4;k++){
+			place[k][0]=SHRT_MIN;
+			place[k][1]=SHRT_MIN;
+			for(i=0;i<MAXSIZE;i++){
+				for(j=0;j<MAXSIZE;j++)
+					if(board_beta[i][j]>0 && board_beta[i][j]==block_data[blockid][k][2]){
+						place[k][0]=i-block_data[blockid][k][0];
+						place[k][1]=j-block_data[blockid][k][1];
+					}
+			}
+			/* printf("%d, %d\n",place[k][0],place[k][1]); */
 		}
-		/* printf("%d, %d\n",place[k][0],place[k][1]); */
-	}
-	for(k=1;k<=4;k++){
-		if(block_data[blockid][k][0]>blockw)
-			blockw=block_data[blockid][k][0];
-		if(block_data[blockid][k][1]>blockh)
-			blockh=block_data[blockid][k][1];
-	}
-	/* printf("%d: %d, %d\n",blockid,blockw,blockh); */
-	for(i=0;i<MAXSIZE;i++){
-		for(j=0;j<MAXSIZE;j++){
-			cost[i][j][1]=1;
-			if(i+blockw>=MAXSIZE || j+blockh>=MAXSIZE) //out of board
-				cost[i][j][0]=-1;
-			else if(   0!=board_beta[i+block_data[blockid][1][0]] [j+block_data[blockid][1][1]] //alredy something
-					|| 0!=board_beta[i+block_data[blockid][2][0]] [j+block_data[blockid][2][1]]
-					|| 0!=board_beta[i+block_data[blockid][3][0]] [j+block_data[blockid][3][1]]
-					|| 0!=board_beta[i+block_data[blockid][4][0]] [j+block_data[blockid][4][1]])
-				cost[i][j][0]=-1;
-			else{
-				cost[i][j][0]=0;
-				for(k=1;k<=4;k++){
-					if(place[k][0]!=SHRT_MIN)
-						cost[i][j][0]+=ABS(i-place[k][0]);
-					if(place[k][1]!=SHRT_MIN)
-						cost[i][j][0]+=ABS(j-place[k][1]);
+		for(k=1;k<=4;k++){
+			if(block_data[blockid][k][0]>blockw)
+				blockw=block_data[blockid][k][0];
+			if(block_data[blockid][k][1]>blockh)
+				blockh=block_data[blockid][k][1];
+		}
+		/* printf("%d: %d, %d\n",blockid,blockw,blockh); */
+		for(i=0;i<MAXSIZE;i++){
+			for(j=0;j<MAXSIZE;j++){
+				cost[i][j][1]=1;
+				if(i+blockw>=MAXSIZE || j+blockh>=MAXSIZE) //out of board
+					cost[i][j][0]=-1;
+				else if(   0!=board_beta[i+block_data[blockid][1][0]] [j+block_data[blockid][1][1]] //alredy something
+						|| 0!=board_beta[i+block_data[blockid][2][0]] [j+block_data[blockid][2][1]]
+						|| 0!=board_beta[i+block_data[blockid][3][0]] [j+block_data[blockid][3][1]]
+						|| 0!=board_beta[i+block_data[blockid][4][0]] [j+block_data[blockid][4][1]])
+					cost[i][j][0]=-1;
+				else{
+					cost[i][j][0]=0;
+					for(k=1;k<=4;k++){
+						if(place[k][0]!=SHRT_MIN)
+							cost[i][j][0]+=ABS(i-place[k][0]);
+						if(place[k][1]!=SHRT_MIN)
+							cost[i][j][0]+=ABS(j-place[k][1]);
+					}
+					if(cost[i][j][0]==0)
+						cost[i][j][0]=MAX(MAX(ABS(i-MAXSIZE/2),ABS(j-MAXSIZE/2)),MAX(ABS(i+blockw-MAXSIZE/2),ABS(j+blockh-MAXSIZE/2)));//*100+ABS(i-MAXSIZE/2)+ABS(j-MAXSIZE/2)+ABS(i+blockw-MAXSIZE/2)+ABS(j+blockh-MAXSIZE/2);
+					cost[i][j][0]=10000-cost[i][j][0];
+					/* printf("%d\n",cost[i][j][0]); */
 				}
-				if(cost[i][j][0]==0)
-					cost[i][j][0]=MAX(MAX(ABS(i-MAXSIZE/2),ABS(j-MAXSIZE/2)),MAX(ABS(i+blockw-MAXSIZE/2),ABS(j+blockh-MAXSIZE/2)));//*100+ABS(i-MAXSIZE/2)+ABS(j-MAXSIZE/2)+ABS(i+blockw-MAXSIZE/2)+ABS(j+blockh-MAXSIZE/2);
-				cost[i][j][0]=10000-cost[i][j][0];
-				/* printf("%d\n",cost[i][j][0]); */
 			}
 		}
 	}