EVENT BOARDSIZE 19 SETUP W D17 C15 C12 K16 N17 SETUP B C10 Q17 R15 COM Problem 159. Black to play. The position is similar to the one in Problem 157. However, there are some differences. These differences should influence the way you erase White's moyo. ENDCOM B 1 H17 MARK B@H15 A@K18 \t@K16 USER CORRECT ANSWER ENDUSER COM Correct Answer. Since the marked stone is on the fourth line, light erasing moves such as caps or shoulder hits are not applicable. Black 1 is the perfect point because it aims at White's weak underbelly at A or a jump at B. ENDCOM VAR B 1 H16 COM Failure. Playing on the fourth line with 1 is bad. ENDCOM W 2 F17 COM White extends to 2 and Black's stone is without roots or follow-up moves. <= ENDCOM ENDVAR VAR B 1 H15 COM Failure. Erasing lightly with Black 1 is a failure. ENDCOM W 2 H17 COM White answers with 2, taking profit. <= ENDCOM ENDVAR W 2 H15 COM That is, if White caps at 2, ... ENDCOM VAR W 2 J17 COM Variation. White might attach at 2. ENDCOM B 3 H15 COM In this case, Black jumps lightly to 3, escaping into the center. ENDCOM VAR B 3 E17 COM However, Black can prevent White from linking up by exchanging 3 ... ENDCOM W 4 D16 COM ... for 4, ... ENDCOM B 5 H15 COM ... then jumping to 5. ENDCOM W 6 H18 COM If White now plays 6, ... ENDCOM B 7 G17 COM ... she can't link up after 7. <= ENDCOM ENDVAR W 4 H18 B 5 G17 W 6 G18 MARK 4@H18 COM Linking up to her stones at the top with 4 and 6 are big moves, but since White was strong here to begin with, this was to be expected. <= ENDCOM ENDVAR B 3 K18 W 4 L17 VAR W 4 F17 COM If White 4 here, ... ENDCOM B 5 L17 MARK 1@H17 COM ... Black answers at 5. In any case, as long as there is room to expand, a deep invasion at 1 is possible. <= ENDCOM ENDVAR B 5 F17 MARK 3@K18 COM ... Black plays 3 and 5, taking profit while making a stable position. <= ENDCOM