Index: src/solver.d
==================================================================
--- src/solver.d
+++ src/solver.d
@@ -51,18 +51,46 @@
 	{
 		const Pos   ro = g.map.robot;
 		const Pos[] la = g.map.lambdas();
 		const Pos[] ra = g.map.razors();
 		const Pos   li = g.map.lift;
+		const Pos[] hi = g.map.objects('W');
 
 		Tuple!(char,int)[] cand;
 		char c = 'W';
 		if( la.empty ) {
 			cand = search(g, ro, [li], death);
 		} else {
 			cand ~= search(g, ro, la~ra, death);
 		}
+
+		// 'higesori' mode
+		if( !hi.empty && g.map.razor>0 ) {
+			int his = 0;
+			for(int dy=-1; dy<=+1; ++dy)
+			for(int dx=-1; dx<=+1; ++dx)
+				if(g.map[ro.y+dy,ro.x+dx] == 'W')
+					his++;
+
+			if(his>=2 || his==hi.length)
+				cand = [tuple('S',int.max)];
+			if(cand.empty) {
+				const(Pos)[] tgt;
+				for(int y=1; y<=g.map.H; ++y)
+				for(int x=1; x<=g.map.W; ++x)
+					if(g.map[y,x]=='.'||g.map[y,x]==' ') {
+						his = 0;
+						for(int dy=-1; dy<=+1; ++dy)
+						for(int dx=-1; dx<=+1; ++dx)
+							if(g.map[y+dy,x+dx] == 'W')
+								his++;
+						if(his>=2)
+							tgt ~= new Pos(y,x);
+					}
+				cand ~= search(g, ro, tgt, death, true);
+			}
+		}
 
 		// 'dig' mode
 		if(cand.empty) {
 			const(Pos)[] tgt;
 			for(int y=1; y<=g.map.H; ++y)