diff -pruN nethack-3.4.1/src/hack.c nethack-3.4.1-bc/src/hack.c
--- nethack-3.4.1/src/hack.c	Sun Feb 23 15:43:27 2003
+++ nethack-3.4.1-bc/src/hack.c	Thu Jul 10 14:26:06 2003
@@ -21,6 +21,57 @@ STATIC_DCL void FDECL(move_update, (BOOL
 
 #ifdef OVL2
 
+
+static NEARDATA int dpx,dpy;	/* boulder being attacked */
+static NEARDATA int breakturns;	/* concentration turn */
+
+STATIC_OVL int
+ma_break()
+{
+	struct obj *bobj, *obj;
+	int success = 0;
+	/* maybe you teleported away or boulder got eaten by a rock mole */
+	if (distu(dpx,dpy) > 2 ||
+		(obj = sobj_at(BOULDER, dpx, dpy)) == 0){
+		Your("chakra vanishes uncontrolled.");
+		make_confused(6+breakturns*P_SKILL(P_BARE_HANDED_COMBAT), FALSE);
+		return(0);
+	}
+	if (breakturns < 48 / P_SKILL(P_BARE_HANDED_COMBAT)){
+		breakturns++;
+		return(1); /* still concentrating */
+	}
+	
+	You("hit the rock.");
+	if (In_sokoban(&u.uz)){
+		pline("Somehow the rock doesn't fall apart.");
+		return(0); /* done */
+	}
+
+	/* even while blind you can first feel and then image the boulder */
+	if (Fumbling || Confusion || Hallucination || Stunned){
+		You("miss your mark.");
+		losehp(d(1,6), "Didn't hit while splitting a boulder.", NO_KILLER_PREFIX);
+		return(0);
+	}
+
+	if (P_SKILL(P_BARE_HANDED_COMBAT) > P_EXPERT ||
+		!rn2(40-(u.ulevel+P_SKILL(P_BARE_HANDED_COMBAT)))) {
+		obj = sobj_at(BOULDER, dpx, dpy);
+		fracture_rock(obj);
+		if ((bobj = sobj_at(BOULDER, dpx, dpy)) != 0) {
+		    /* another boulder here, restack it to the top */
+		    obj_extract_self(bobj);
+		    place_object(bobj, dpx, dpy);
+		}
+		pline_The("boulder falls apart.");
+	} else {
+		pline("But you are not strong enough to damage the boulder.");
+		losehp(d(1,6), "trying to split a boulder.", KILLED_BY);
+	}
+	return(0); /* done */
+}
+
 boolean
 revive_nasty(x, y, msg)
 int x,y;
@@ -1064,19 +1115,33 @@ domove()
 	if (flags.forcefight ||
 	    /* remembered an 'I' && didn't use a move command */
 	    (glyph_is_invisible(levl[x][y].glyph) && !flags.nopick)) {
-		boolean expl = (Upolyd && attacktype(youmonst.data, AT_EXPL));
-	    	char buf[BUFSZ];
-		Sprintf(buf,"a vacant spot on the %s", surface(x,y));
-		You("%s %s.",
-		    expl ? "explode at" : "attack",
-		    !Underwater ? "thin air" :
-		    is_pool(x,y) ? "empty water" : buf);
-		unmap_object(x, y); /* known empty -- remove 'I' if present */
-		newsym(x, y);
-		nomul(0);
-		if (expl) {
-		    u.mh = -1;		/* dead in the current form */
-		    rehumanize();
+		struct obj *obj;
+		if ((obj = sobj_at(BOULDER, x, y)) != 0 && 
+			weapon_type(uwep) == P_BARE_HANDED_COMBAT) {
+			if (P_SKILL(P_BARE_HANDED_COMBAT) < P_BASIC){
+				You("don't know enough about martial arts to try splitting a boulder.");
+			} else {
+				You("start molding Chakra.");
+				dpx = x;
+				dpy = y;
+				breakturns = 0;
+				set_occupation(ma_break, "molding chakra", 0);
+			}
+		} else {
+			boolean expl = (Upolyd && attacktype(youmonst.data, AT_EXPL));
+			char buf[BUFSZ];
+			Sprintf(buf,"a vacant spot on the %s", surface(x,y));
+			You("%s %s.",
+			    expl ? "explode at" : "attack",
+			    !Underwater ? "thin air" :
+			    is_pool(x,y) ? "empty water" : buf);
+			unmap_object(x, y); /* known empty -- remove 'I' if present */
+			newsym(x, y);
+			nomul(0);
+			if (expl) {
+			    u.mh = -1;		/* dead in the current form */
+			    rehumanize();
+			}
 		}
 		return;
 	}