EVENT BOARDSIZE 19 SETUP W C18 D17 E17 H17 Q12 R3 R4 R6 S6 D3 C5 E5 B8 B9 C9 C11 D11 E11 F6 G6 H4 J3 K3 SETUP B B17 C17 D16 C15 F15 P17 R16 R8 P7 Q5 Q4 Q3 C8 D10 E10 F10 E8 E6 H8 J6 K4 L4 L3 MARK \t@Q12 COM Problem 76. Black to play. White enters Black's sphere of influence with the marked white stone. How should Black attack ? ENDCOM B 1 P11 USER CORRECT ANSWER ENDUSER COM Correct Answer. The shoulder hit of Black 1 not only attacks the invading white stone, it also maps out a large moyo. ENDCOM VAR B 1 P13 MARK \t@Q12 COM Failure. Attacking the marked stone with the shoulder hit of 1 is the wrong direction. ENDCOM W 2 P12 B 3 O12 W 4 P10 COM Black gains no territory with these moves and he drives the white stones into his potential moyo. It is unreasonable to expect to kill the white stones in such an open space, especially since Black's stones in the lower right are thin. <= ENDCOM ENDVAR VAR B 1 O12 COM Failure. Although capping is a good way to attack in many positions, Black 1 is bad. ENDCOM W 2 P11 B 3 O11 W 4 P9 MARK B@O10 A@Q8 2@P11 COM The result after White 2 and 4 is similar to the preceding diagram. White is now aiming at A, so Black must defend. Therefore, White will be able to play on the vital point of B. ENDCOM ENDVAR W 2 P12 COM If White pushes out with 2 ... ENDCOM VAR W 2 R15 COM Continuation. In the game, White forced with 2 ... ENDCOM B 3 Q16 W 4 Q11 COM ... and 4, ... ENDCOM B 5 Q10 W 6 P14 COM ... then jumped to 6. ENDCOM B 7 S15 COM Black made his corner thick with 7, then ... ENDCOM W 8 N14 B 9 M12 COM ... followed it up by mapping out a large moyo with 9 ... ENDCOM W 10 L14 B 11 K13 COM ... and 10. Note that White's moves have gained her no territory, while each of Black's have expanded either his moyo or secured the corner. <= ENDCOM ENDVAR B 3 O12 W 4 O13 COM ... and 4, ... ENDCOM B 5 N13 MARK A@N12 3@O12 COM ... the two-step hane of Black 3 and 5 is severe. Simply extending to A with 5 is also good, and this move avoids complications. <= ENDCOM