Index: src/solver.d
==================================================================
--- src/solver.d
+++ src/solver.d
@@ -432,11 +432,11 @@
 		if(s.g.cleared) state = Fixed;
 		else if(s.g.dead) state = Tentative_Stuck;
 		return tuple(s.g.score, s, log, state);
 	}
 }
-
+/*
 class MasterSolver : Solver
 {
 	this(in Game g)
 	{
 		int SIZE = g.map.H * g.map.W;
@@ -451,9 +451,10 @@
 	private Solver sub;
 	char single_step() { return sub.single_step(); }
 	void force(char c) { sub.force(c); }
 }
 
-//alias MasterSolver MainSolver;
+alias MasterSolver MainSolver;
+*/
 alias Solver_2!(Solver_1) MainSolver;
 //alias Solver_1 MainSolver;
 //alias Solver_0 MainSolver;