EVENT BOARDSIZE 19 SETUP W C17 D16 F16 L17 O17 Q18 K4 D4 F4 P9 SETUP B R17 Q16 Q14 R9 Q7 Q3 M4 C6 C11 C14 B16 MARK B@Q11 1@P9 2@Q7 A@R10 COM Problem 165. White to play. After the exchange of White 1 for Black 2, White's first instinct may be to attach at A. There is an interesting move here. Where should White play ? ENDCOM W 1 R3 MARK \t@Q7 USER CORRECT ANSWER ENDUSER COM Correct Answer. It seems as if Black has strongly reinforced the lower right by playing the marked stone. however, White can still attach at 1. The timing of this move is important; it must be played after Black has played the marked stone. ENDCOM B 2 R4 COM In response to Black 2, ... ENDCOM W 3 Q4 COM ... White cuts at 3. ENDCOM B 4 R5 MARK A@Q2 B@P3 C@S3 COM Black might extend to 4, but then White can live in the corner by playing A - Black B - White C. The way White plays is a strategic decision that depends on how the situation on the outside develops. ENDCOM VAR B 4 Q2 COM Variation. Black 4 is a fighting move. ENDCOM W 5 Q6 COM White attaches at 5, ... ENDCOM B 6 Q5 W 7 R6 B 8 P6 W 9 R7 B 10 Q8 W 11 R5 B 12 P4 W 13 S4 MARK 1@Q2 \t@R3 COM ... and the moves to 13 are one variation. The result is not so good for Black. Still, Black 1 is a solid move. Therefore, White's timing in playing the marked stone is important. <= ENDCOM ENDVAR W 5 P11 COM In the meantime, White simply jumps to 2, threatening the right side. It is decisions such as these that make Go so interesting. <= ENDCOM