10.16 (a) A base on balls shall be scored whenever a batter is awarded first
base because of four balls having been pitched outside the strike zone, but
when the fourth such ball touches the batter it shall be scored as a "hit
batter." (See 10.18 (h) for procedure when more than one pitcher is involved
in giving a base on balls: Also see 10.17 (b) relative to substitute batter who
receives base on balls.) 
(b) Intentional base on balls shall be scored when the pitcher makes no
attempt to throw the last pitch to the batter into the strike zone but purposely
throws the ball wide to the catcher outside the catcher's box. (1) If a batter
awarded a base on balls is called out for refusing to advance to first base, do
not credit the base on balls. Charge a time at bat. 

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