1 Q16 The board is empty, so the first priority is a corner enclosure that balances territory and influence. Q16 is the upper-right 4-4 point: it claims a corner without overextending, leaves flexible responses to a 3-4 approach or a pincer, and does not commit the lower side. A 3-4 such as Q17 is also sound but slightly more territorial and less flexible against an immediate low approach; the star point keeps both sides open for the next corner. 2 D4 Black opened at the 4-4 point Q16 in the upper-right. With komi 7.5 in White's favor, there is no need to rush into a fight; taking an empty corner of my own is the standard balanced choice. I'll play the diagonally opposite 4-4 point at D4 in the lower-left, keeping options open for either side and leaving the choice of approaching Black's corner for later. 3 D16 Black has only Q16 and White has just taken the lower-left 4-4 at D4, so the urgent task is still to claim an empty corner rather than answer a stone that is not yet threatening anything. D16 occupies the upper-left 4-4, balancing the board and leaving the lower-right open for later. Approaching D4 immediately would be smaller while two corners remain empty; if White next takes Q4, Black can still choose an approach or a side extension with a normal framework. 4 Q4 With Black holding both upper star points and White at D4, the largest whole-board point is the remaining lower-right corner at Q4. I considered an immediate approach to D16 around C17/C14, but move four is early and taking the last empty corner keeps simple balance while leaving later choices about the top side open. 5 R6 Black has both upper 4-4 stones while White holds both lower corners, so the urgent big points are approaches rather than a small extension from D16 or Q16. R6 approaches Q4 from the high side and coordinates with Q16 on the right, aiming at the side while leaving a later choice of pincer or tenuki. If White answers locally with R3, P3 or Q6, Black can still take the other approach at C6; extending on the top now would let White settle a corner unchallenged. 6 Q6 Black's R6 approaches my Q4 corner stone; answering locally keeps the initiative on the right side. Q6 extends from Q4, pressures R6, and builds a right-side framework in one move. Tenuki to the left side is possible but leaving Q4 squeezed low (e.g., Black Q6 or P5 press) concedes too much influence early. 7 R7 White’s Q6 attaches to my lone R6, so I extend to R7 to connect and keep that stone from becoming heavy. If White answers at Q5 to link Q4 and Q6, I can later press with S6 or shift to a large point; if White plays R5, S5 still holds the edge. Tenuki toward D4 or the top leaves R6 to be sealed in for little compensation, so the extension is more urgent than a new approach. 8 Q7 Black's R6–R7 pair is pressing my Q6 stone and trying to turn the whole right side into a moyo linked with Q16. W Q7 extends/block at the head of R7, connects solidly to Q6, gives that group room toward the center with Q4 behind it, and stops Black from enlarging the right edge cheaply. Tenuki to approach D16 or develop the lower left is a big point, but letting Black seal the right side (e.g. Q7/R8 next) is the more urgent local loss, so I answer here before taking other big points. 9 R8 Black’s R6–R7 pair is in direct contact with White’s Q6–Q7 press and still lacks an exit, so extending to R8 keeps the group connected and heads toward open space rather than into White’s Q4. If White answers around R5 or Q5 to seal the bottom, Black can treat that locally or shift to an empty corner; ignoring the contact for a corner such as C17 would let White cap or seal the floating stones immediately. Q8 does not connect to R7 and is thinner than the direct extension. 10 C14 The lower-right fight is stable for now—my Q6/Q7 stones have room, and Black's R8 doesn't threaten an immediate capture—so I'd rather take the last big opening point. Approaching Black's D16 corner with C14 is the largest move on the board; if Black responds locally, I can return to the right side later with moves like Q8 or R9. 11 F16 White’s C14 knight approach does not yet endanger D16, while the R6–R8 stones still have room to run, so a calm extension is better than starting a second fight. F16 extends away from the approach, builds the open upper side toward Q16, and keeps D16 flexible. If White enters the corner with C16, Black can later settle the right-side group; a tight pincer such as E14 would create another weak group while that group is still thin. 12 C17 In the upper left, Black has D16 and F16 pressing my C14 stone; taking C17 secures the corner territory and gives my stone a solid base rather than letting Black enclose the corner. Elsewhere, my Q4/Q6/Q7 group is stable against Black's right-side wall, so no urgent defense is needed there. The corner is the biggest remaining point; if Black answers at D17 or E17, I can extend along the side. 13 C16 White’s C17 is a 3-3 invasion beside D16, and C14 is already sitting outside, so ignoring it lets White both live in the corner and connect. C16 blocks that link, attaches to D16, and leaves C17 cramped in the corner while C14 stays thin. Blocking at D17 instead would allow C16 and a comfortable connection to C14, giving away the corner and the side together. 14 D17 Black C16 cut my C17 stone from C14, so I need to stabilize while keeping pressure on Black's top stones. W D17 connects C17 outward, gives the group four liberties (B17, C18, D18, E17), and wedges against D16/C16, limiting Black's easy connection. If Black answers with F17 extending from F16, I live comfortably with C18 or B17; if Black pushes C15, my C14 stone provides backup. This is better than a plain C18 extension, which defends but lets Black develop F16 unpressured. The right-side fight (Q6/Q7) is stable for now, so the top is the urgent point. 15 E17 White’s D17 leaves the E16 cut between D16 and F16, so a local reply is more urgent than a corner tenuki. E17 attacks the C17–D17 group and makes E16 self-atari for White, so the connection is secured without filling it immediately. If White runs with D18 or C18, Black can connect at E16; a direct E16 now is solid but gives up the attack. 16 D18 White’s C17-D17 pair is under pressure from Black’s C16/D16/E17/F16 shape, so I want to strengthen it before Black can seal the top. D18 extends the two stones upward, adds liberties/eye space, keeps pressure toward E18/F17, and coordinates with C14. If Black answers around C18 or E18, White can still run to B17/F17; B17 is playable but more edge-bound and less central. 17 E18 White’s D18 extension is trying to settle the upper-left group and take the corner, while Black’s E17 still needs support. E18 presses that group, removes a liberty and links with E17, so a white reply such as C18 only makes a heavy shape rather than a living corner. This is more urgent than a distant approach such as C6, and cleaner than C15, which would leave E18 available for White. 18 C18 Black's E18 puts my D18 stone near atari, so I connect with C18, linking D18 to the C17–D17 group and giving the whole group solid liberties while still pressing the black E17/E18 stones. This also keeps pressure on black's corner rather than letting them settle easily. 19 E6 E6 approaches White’s unapproached D4 star point from the open center side, keeping a later corner entry available while developing toward empty space. If White answers at D6 or C3, Black can continue without being sandwiched under White’s C14. This is better than the slow connection at E16, since White cannot safely cut there, and better than C6, which would approach into White’s stronger left side. 20 Q5 The right side has White Q4 separated from Q6/Q7 by the empty Q5, while Black’s R6–R8 wall is pressing them; White Q5 is the vital connecting point that unifies the right-side stones into a strong, settled chain and limits Black’s wall. Black E6 was a loose central move rather than an immediate kill on D4/C14, so connecting at Q5 outweighs answering locally; if Black replies R5/S6, the connected White group still has ample liberties and edge base. 21 R9 White’s Q4–Q7 wall is pressing the R6–R8 chain toward the edge, so the urgent point is the head of that group rather than a new corner. R9 extends the chain upward toward Q16, keeps an escape route, and stops White from capping at the same point. A local base such as S7 is smaller: it does not stop the cap, while tenuki elsewhere lets White seal the group in. If White then pokes at S7, Black can still answer on the side with room to run. 22 O17 Black’s R9 extends the right-side wall, but White’s Q4–Q7 group has ample liberties, so I prefer to take the larger fuseki point with a kakari at O17 against Black’s P16 hoshi. If Black answers around O16/R16, White can settle lightly with P17/Q17 or develop along the top, while ignoring the right side leaves Black no immediate capture. 23 R17 White’s O17 is a large-knight approach to the Q16 star point, while the upper-left white clump still has room in the corner and is not short enough of liberties to demand an immediate attack. R17 is the small-knight enclosure: it claims the upper-right corner, keeps Q16 from becoming thin, and does not start an unnecessary fight. Extending down the right side or striking at B17 can wait; if White ignores R17, the corner remains a stable follow-up rather than an open invasion point. 24 P16 Black’s R17 pressuring O17 is the current local point, but O17 still has room and the larger whole-board issue is Black’s right-side wall Q16/R17 linking down toward R6-R9. I’ll reinforce O17 while pressing Q16 with P16, giving my top-right stone a base and limiting Black’s upper-right framework; if Black answers around Q16/R17 I can continue light, whereas simply tenuki risks O17 being surrounded. This is preferable to a lower-right approach into Black’s strong R-line wall. 25 Q17 White’s P16 leaves Q16 and R17 only diagonally related, so a cut at Q17 or R16 would split Black’s upper-right stones. Q17 connects them at once and takes the high point beside the corner. If White answers at P17 to join O17 and P16, Black can still settle with R16 or R18; ignoring the contact for a distant point would leave two weak stones. 26 P17 Black Q17 pressures the White O17/P16 pair in the upper right, so the urgent point is to connect and take the shape point rather than tenuki. P17 links O17 and P16 into one group, reduces the liberties/scope of the Q17-R17 black stones, and keeps options like O18/Q18 pressure; if Black extends with R16, White can continue around O18 while the lower-right White stones still have space. 27 R13 Black’s upper-right group Q16–R17 is safe with several liberties, so White’s P17 does not require a local answer. R13 is a third-line extension that links the R6–R9 wall with the upper-right stones and claims the largest open side. If White answers by invading around R11 or taking the bottom-left corner at C3, Black can fight with stones on both sides or accept a smaller corner; C3 itself would secure less and leave the invested right-side stones uncoordinated. 28 Q14 Black R13 expands a broad right-side moyo linking R17/Q17 with R9/R8/Q6, so reducing it before it becomes solid is the largest whole-board issue. Q14 uses White’s O17/P17/P16 stones as support, presses the gap near R13/R17, and keeps options toward P15/Q15 while also helping the lower-right White stones indirectly. I considered a deeper invasion like S14, but it is too close to Black’s thickness; Q14 is a safer multipurpose reduction that retains initiative. 29 R14 White's Q14 is a lone probe sitting on the gap between my upper-right group and the R-file wall, and the point I cannot concede is R14: if White takes it, Q14 gains an edge base and R13 is cut off from the side. R14 attaches to Q14 while linking with R13, so it both contains the probe and starts to close the right-edge framework. If White answers Q15, I can continue with R15, keeping both groups safe and the edge stones connected in spirit; a tenuki such as C3 leaves this large framework open for an immediate invasion. 30 O15 White should play O15 to connect O14 with the O16/O17/P17 group before Black can wedge at O15; this makes the top-right chain solid while leaving R14/R13 as an outside, somewhat overextended wall. The main reply is Black pressing around P14/Q14, but after connection White has ample liberties toward N15/N17 and the center. I prefer O15 to P14 because P14 still leaves the O15 cutting/wedge point between the white stones. 31 Q15 White’s cutting stone at Q14 has only P14 and Q15 as liberties, and O15 does not connect to it. Q15 is atari and links to Q16; if White ignores it, P14 captures the cutter and joins Black’s upper-right stones, so P14 is the only save. That exchange leaves Q14–P14 thin while Black keeps the initiative, which is more urgent than opening an empty corner such as C3. 32 P15 Black Q15 is trying to cut White's top-right stones (O15/O16/O17/P17) from the Q14/Q4 side, so the urgent point is the P15 connection/contact that challenges the cutter while linking toward Q14. If Black answers locally around R15/Q16, White can continue with liberties toward N15/N16 and keep the right-side black wall separated. Compared with simply extending N16, P15 is more active: it defends the group and immediately questions Q15 rather than letting Black consolidate Q15–R14. 33 R15 The upper-right fight is the urgent area: Q15 and R14 are only diagonally adjacent, so R15 is the point that connects the Q17–Q15 group to R14–R13 and denies White the cut. After R15, White’s strongest reply is to stabilize the thin Q14 stone, for example at P14 or Q13; Black can then take a large empty corner. Tenuki to a bottom corner leaves that cut available and makes the invested right-side stones heavier, so the connection comes first. 34 S15 The urgent fight is the upper-right white group around O15/P15/P16/P17/Q14; Black R15 tightens liberties and threatens to separate Q14. Playing S15 extends toward the edge, adds liberties to the Q14/P15 stones, and puts immediate pressure on the R15/R14 black chain, while still keeping connection with P15. The alternative of simply running toward the center would let Black consolidate the right edge; S15 contests the side and can capture or severely damage R15 if Black answers carelessly. 35 S16 White’s S15 is a thin second-line attachment under Black’s connected R13–R17 wall, and leaving S16 lets White link upward into a much harder invasion. S16 connects to R16, cuts that escape, and drops S15 to S14 and T15. If White runs with S14 or hanes at T16, Black keeps the corner and the chase; a distant corner such as C3 gives up this concrete local profit. 36 T15 Black S16 puts the White S15 stone under immediate pressure (it has only the edge points S14/T15 as outlets, with R15 and S16 black). The urgent task is to save S15 and keep the right-side White group connected; extending to T15 along the edge gives the S15–T15 pair liberties at S14, T14 and T16, stabilizing the corner side while still eyeing the Black R15/Q15 stones. Compared with S14, T15 better uses the edge and avoids being sealed low, and it answers the local atari threat rather than tenukiing into a loss of the right-side stones. 37 T16 White's T15 pressures S16 and the edge, so Black should answer locally rather than tenuki. T16 connects to S16, takes the point White wants, and leaves S15–T15 with only S14 and T14, so S14 next is atari. If White answers at S14 or T14, Black can still connect with S17; if White cuts at S17, R16 joins S16–T16 to the main group. S14 first is worse because White's T16 would both escape and attack S16. 38 T14 The S15/T15 white stones are squeezed against the edge by Black's T16 and are down to very few liberties (only S14/T14), so securing them is the urgent local issue before they get ataried. W T14 extends the edge group downward, adds liberties and eye/escape potential toward T13/S14 while keeping pressure near Q14. The main alternative S14 is more cramped and leaves Black a useful T14 point; T14 better balances life and edge territory. 39 K4 White’s D4 and Q4 anchors threaten to link across the open bottom, while the upper-right Black group still has ample running room and the S14 atari on S15–T15–T14 remains a standing threat. K4, the empty bottom star point, splits those two White positions before either can extend. C6 only approaches the lone D4 stone and leaves the larger bottom framework untouched, so the whole-board point comes first. 40 S14 Black’s K4 tenukied away from the unresolved upper-right fight (moves 28–38), so White should punish locally rather than answer the lower side. Playing S14 connects the White T14/T15/S15 chain, keeps the Black R14/Q15/R15 group short of liberties, and turns Black’s ignored area into a concrete gain. The main reply is Black extending or capturing around R13/S13, but White’s connected stones have enough liberties and shape to continue the race; this is larger than defending D4/Q4 lower stones right now. 41 S13 White's S15-T15-S14-T14 group has only S13 and T14's remaining liberty at T13, so S13 is the urgent point. S13 connects to R13 and the large Q-R group, leaving White in atari; T13 is the only reply, after which T12 captures the whole group, while ignoring S13 lets Black take four stones at once with T13. A quiet move such as a bottom extension gives up this forced capture for nothing comparable. 42 T13 The right-edge White stones R15/S15/T15/T14/S14 are down to very few liberties after Black S13, so White must extend immediately. T13 connects downward from T14, adds the T12 escape liberty while keeping R14, and also presses the S13 stone; if Black tries R14, White can continue toward T12 rather than being folded into atari. This is more urgent than any corner or side enlargement. 43 T12 Captured 5. White’s T13 stone joins the S14–S15–T14–T15 chain, and that whole group now has only T12 as a liberty. T12 is not suicide: it keeps S12 and T11 while removing the group’s last liberty, so it captures all five stones. Connecting at R16 can wait, since White cannot occupy that point, and no other area compares with this capture. 44 S12 The right-edge White group (S14/T14/T15) is being pressed by Black's wall down to T12, so I need liberties and edge space before it gets surrounded. W S12 extends along the side, connecting toward the edge and blocking Black's descent while giving the group room for eyes; if Black answers around R12/S11, I can continue settling with T11 or the edge. Tenuki to the empty bottom is tempting, but the right group is more urgent than a big point. 45 R12 T12 is in atari after S12, but simply saving it at T11 lets White keep the vital R12 point. R12 connects to the R13 group and ataris S12, so White must answer at S11 or lose the stone; Black can then play T11, extending downward while sealing the edge. That is better than tenuki, which would allow White to capture T12 and roll down the side toward the R6–R9 stones. 46 S11 Black R12 has put the white stone S12 in atari (its only liberty is S11, with R12/T12/S13 all black). Playing S11 extends that stone to three liberties (R11/T11/S10) and keeps pressure on the black R12/T12 edge group, rather than conceding the edge and letting Black solidify toward S14/T13. I considered tenuki to the lower side, but losing S12 strengthens Black's right wall too much, so the local rescue is the urgent move. 47 R11 White's S11-S12 pair has only three liberties and sits inside Black's strong right-side group, while T12 is still thin. R11 connects to R12 and cuts those liberties to two; if White answers T11 to catch T12, T13 links T12 back to S13 and leaves the white stones cramped on S10 and T10. That is more urgent than a quiet corner approach such as C3, which lets White settle this foothold. 48 S10 Black’s R11 tightens the liberties of the S11–S12 stones, so White should extend at S10 toward the open 10th line rather than add the diagonal T11. This gives the lower right group running room through R10/T10/T11 while keeping pressure on R11–R12; if Black answers at T11, White can still run with R10 or T10. I prefer this to purely defending the upper right with R14 because the immediate capture threat is more urgent. 49 R10 White’s S10 makes R10 the cutting point between R11 and the R9–R6 chain, which is already pressed by White’s Q4–Q7 wall. Playing R10 connects those groups into one chain with ample liberties and removes White’s contact cut. If White next cuts at R15, the upper R16–T16 stones still have several liberties and room, whereas leaving R10 lets White split off the more vulnerable lower stones immediately. 50 T10 Black R10 tightens the right-edge fight against the S10–S12 stones, so White should extend to T10 to connect outward along the edge and add liberties. If Black blocks at T11, White can continue around T9 rather than crawl low with S9 into the R-column wall. This keeps the right group alive without abandoning the larger whole-board position. 51 T14 T12 is in atari and T11 is illegal for Black, since it does not capture the S10–T10 group. T14 captures the one-liberty stone at T13, gives T12 a new liberty, and removes a liberty from the R14–S14 group. If White then plays T11, Black answers at T13 and connects T12 through S13 into the R-file wall; ignoring the atari would only let White take T12 and thicken the edge. 52 T15 Black T14 has only one liberty (T15) because T13/T12/S14 surround it, so White T15 captures T14 and simultaneously relieves the atari on S14. This is the urgent local tactic; after the capture the right-side white group reconnects toward S14 while black's outside remains thin. I considered simply extending R14 to save S14, but that still leaves the group with too few liberties and ignores the capture. 53 S15 Captured 1. White’s T15 is in atari with S15 as its only liberty, so capturing it immediately removes the cutting stone before White can connect. After S15, the capture is not a ko: the new stone joins the R15–S16 group, which has ample liberties including the emptied T15 and S14. Ignoring the atari would let White play S15 and keep a wedge between T14 and the upper-right stones, which is more urgent than any quiet expansion elsewhere. 54 D10 Black S15 has put the lone T15 stone in atari, and extending to T16 only creates a heavier dead shape against the solid black Q–T wall, so I abandon that stone rather than rescue it. The right edge is Black's strong, settled area, while the entire left/lower side is still open; the biggest whole-board move is to develop the vacant left side around D10, which also gives the upper-left white stones (C17/D17/C18/D18) more room and builds a White framework. I prefer D10 over a desperate right-side save because the save is tactically losing and the open side is worth much more. 55 D6 White’s D10 is not an immediate threat, but together with D4 it aims at a large left-side framework. D6 connects to the E6 stone, splits that gap, and keeps a route toward the bottom, whereas a slow top extension such as H16 leaves the larger left area untouched and a C3 invasion would only thicken White. 56 E5 Black D6/E6 builds a strong lower-left wall and threatens to enclose White’s D4 stone while expanding toward the center-left. White E5 connects outward from D4, attacks the D6/E6 formation from the front, and keeps a path toward D10; if Black answers around E4 or F6, White can extend D5/F5 and stabilize. I prefer this over purely defending the right side because D4/D10 becoming a floating target would give Black too much initiative. 57 R18 White’s E5 does not immediately endanger D6–E6, which still has several liberties and room to run upward, so a local answer such as F5 is not mandatory. The upper-right corner is the larger point: R18 extends the strong R17–Q17 group toward the empty corner and limits White’s O–P stones. If White answers at P18 or Q18, Black can continue with the corner; if White returns to E4, the corner extension is already in place. 58 O18 Black R18 extends along the top and increases pressure on the O17/P17 stones, so I want a calm top-edge answer that also eyes R18. O18 connects the upper white stones toward the corner side, keeps Q18/S18 as continuations, and avoids overcommitting in the lower side before this group is settled. If Black answers around Q18, White can continue locally; tenukiing the top risks giving Black a clean surrounding framework. 59 R3 White’s Q14 is in atari, but capturing at P14 only removes a wedge that does not cut the Q-line group, while the bottom-right corner is still open beside White’s P4–P7 wall. R3 is the 3-3 of that corner: it takes the point White most wants to enclose, and a lone 3-3 can live against Q3, R4 or a later surround. I prefer that to P14, after which White could take this corner, and to C3, which leaves White’s supported corner untouched. 60 C3 Black's R3 is the 3-3 point of the lower-right corner, but my O4–O7 stones already limit that corner's expansion, so it isn't urgent to answer locally. The largest open area is the lower-left corner, which is completely empty and sits next to my D4/E5 stones. Taking the 3-3 point at C3 secures solid corner territory and coordinates with my left-side wall, comparable in value to anything Black gained with R3. 61 P8 White's lower-right stones at P6 and P7 are thin against the Q-file wall, while Q5 and P4 cannot connect cleanly through P5. P8 joins Q8, takes a liberty, and starts that attack without leaving a floating stone. If White runs with O6, Black can continue with P9 or O7 and thicken the right side; a quiet top move such as F17 leaves this defect untouched. 62 S9 Black P8 presses the White P7/Q6/Q5/Q4 chain on the lower-right, while White's S10/T10 stones are nearby on the edge. Playing S9 links the edge group downward, gives the P7 chain an outlet toward S7/T8, and simultaneously threatens the liberties of Black's R8/P8/R6 stones. If Black answers around R9 or S8, White can connect through S7 or run via O7 toward the center; this is safer than trying to cut at Q8, which would be nearly self-atari into Q7/R8/P8. 63 S8 White’s S9–S12 group is cramped against the R-file wall and has no eye yet; S8 is the one safe liberty that seals its second-line escape and connects to R8. T9 is only a self-atari, and R16 is unnecessary because the upper stones already connect through Q15. After S8, White’s best try is T9, which still leaves the group short of eyes and lets Black keep the edge. 64 T11 R11/R12 are already in atari with only S11, but playing S11 connects into a bulky edge group that Black can atari with T11 and chase into T9/T8. I prefer to sacrifice the two stones and play T11 to stabilize the S9/S10/T10 stones while making Black spend S11 to capture; this keeps more edge space and avoids compounding the loss. 65 T9 Captured 6. White's T11 stone joins S9–S12, S10–S11 and T10 into one chain whose only remaining liberty is T9. Playing T9 captures those six stones and is not suicide, since the capture opens liberties. Ignoring this to play elsewhere would throw away a large, forcing gain on the right side. 66 S10 Black T9 leaves the white S9 stone with only the S10 liberty, so S10 is the urgent saving extension rather than a side or corner point. I considered T10 to link toward T11, but Black could then play S10 and capture S9 immediately. After W S10, the S9-S10 group has liberties at S11 and T10 and can next connect toward T11 if Black presses. 67 T10 White's S10 is an isolated invasion inside Black's right-side group, which is already connected from R6 through R18 and has ample eye space above. T10 takes the edge base, connects to T9, and leaves S10 with only S9 and S11; S9 is then self-atari, so White must run to S11 or lose the stone. S11 first would allow White the better base at T10, and tenuki would let that invasion settle. 68 S11 White S10 has been reduced to two liberties by Black T10, with R10/T10 black and only S9/S11 open. Extending at S11 gives the S10–S11 group three liberties (S9, S12, T11) and keeps a foothold against Black’s right-edge wall; if I abandon it, Black connects T10 to T9/T12 and the entire right side becomes solid. I considered S9, but that leaves the combined group with only S11 and is effectively self-atari into Black’s thickness, so S11 is the better rescue/forcing move. 69 S9 White's S10–S11 stones are cutting the right edge, and S9 is the vital point that both links T9–T10 to S8 and takes away their best downward liberty. If Black instead connects at R9, White can play S9, isolate T9–T10 and thicken the invasion. After S9, White's strongest try is T11 or R10 to run; Black can keep chasing while the larger Q9–R8 link remains available next. 70 T11 The white pair S10-S11 is reduced to very few liberties by Black S9, so saving it is urgent; W T11 reconnects along the edge and gains S12/T12 breathing room while keeping pressure on the surrounding black stones. If Black answers at T12 or S12 to press, White can continue running toward the center/right and make Black's edge overconcentrated. Ignoring this lets Black solidify the whole right side too cheaply, while moves elsewhere are slower than this life-and-death boundary.
Reasoning
The white pair S10-S11 is reduced to very few liberties by Black S9, so saving it is urgent; W T11 reconnects along the edge and gains S12/T12 breathing room while keeping pressure on the surrounding black stones. If Black answers at T12 or S12 to press, White can continue running toward the center/right and make Black's edge overconcentrated. Ignoring this lets Black solidify the whole right side too cheaply, while moves elsewhere are slower than this life-and-death boundary.
