(;
EV[Kisei FT]
RO[2]
DT[2015-12-3]
PB[Sato Masaharu]
BR[9P]
PW[Michael Redmond]
WR[9P]
KM[6.5]
RE[W+R]
C[Kisei FT
White:  Michael Redmond 9P
Black:  Sato Masaharu 9P
Commentary:  Michael Redmond 9P
Published in the April 19, 2016 edition of the American Go E-Journal

As a special free bonus for all E-Journal readers, Michael Redmond's 2nd round Kisei FT game commentary against Sato Masaharu 9P appears here.  Full AGA members get exciting commentaries like this every week.  The game commentaries alone are worth the price of AGA membership.  For youth memberships the deal is even better, just $10 a year!  To sign up for the members edition, register with the AGA here:  http://www.usgo.org/join-aga-today.

Michael gives this background for the game:  "In the 2nd round of the Kisei FT played on 2015-12-03, I have White against Sato Masaharu 9P.  Sato is known to be a strong fighting player, and has entered the Meijin league twice."];
B[cp];W[dd];B[pq];W[qd];B[oc];W[ep];B[hp];W[en];B[eq]
TR[en]
C[As far as I know, this tsuke was first suggested by Go Seigen 9P.  The idea is to make a strong corner group, take away White's potential eye shape, and to force White into an over concentrated shape in which the marked stone becomes redundant, which the variation for White's next move shows.]
(;
W[gp]
C[White's attachment is a tesuji.  There is no established joseki, but I have some ideas about how Black should continue (see the 5 variations for Black's next move).]
(;
B[fq]
LB[dp:A]
C[The game move.  Black's nobi looks a bit vulgar, and as I indicated in the variations for this move, I think Black should have played at A.];
W[gq];B[fp];W[go];B[fo];W[fn];B[gn];W[ho];B[gm];W[cn];B[dj]
C[The corner has some aji, but ...]
(;
W[ek]
C[... White cannot immediately destroy Black.  See the variation.];
B[ej];W[cq]
C[White's tsuke is the tesuji in this shape, and Black must be careful.]
(;
B[dp]
C[For the time being, White's outside groups are too weak for an attack against the corner to work.  See the variations.]
(;
W[gl]
C[Mainly, this tsuke is played to move out into the center with good shape.  As Black runs out with the two stones in the center, White will be able to strengthen the lower side group.];
B[in];W[io];B[jn];W[hl];B[hn];W[kp]
LB[gr:A]
C[Now the hanetsugi at A is no longer forcing for Black, so White is one step closer to attacking the corner.];
B[fm]
C[Black attacks first to forestall a White attack against the corner.  White has a very loose shape, and I will not be able to save all of my stones.];
W[dk];B[em]
(;
W[cj]
C[See the variation.];
B[ci];W[ck]
LB[dn:A]
C[Next, a White move at A will be forcing against the corner, cutting off Black's center group with sente.];
B[dn];W[dm];B[eo];W[mq]
C[This finishes the fight in the lower left corner.  Both sides have about 20 points of territory.  White has control of the left and lower sides, which changes the balance of power in the remaining corners.  Overall, White has a slight advantage.];
B[fc];W[df]
LB[eh:A]
C[Next, a White move at A will capture the left side.];
B[eg];W[ff];B[fj];W[bi];B[fk];W[jc]
TR[gl][hl]
C[White switches to the upper side.  Black has thickness in the center, so moving out with the marked White stones would be too heavy.];
B[dc];W[cc];B[ed];W[db];B[eb];W[ec];B[jp];W[jo]
(;
B[ko]
C[If White answers this ko threat, Black will continue with the ko in the upper left.  Black will have a number of ko threats in the lower side area, and will have an advantage in the ko.];
W[dc]
C[Finishing the ko is a large move.];
B[kq];W[lp];B[jq]
C[Originally, White had more than 10 points on the lower side, and now Black's territory has increased by about 20, so the value of this ko threat might seem to add up to about 30 points.  However, the semeai has some aji, which White can make use of to take profit in the two adjacent corners, thereby reducing Black's profit.];
W[hr];B[ir];W[fr]
C[Black has a choice now.]
(;
B[ip]
C[Black chose not to let me squeeze from the right side.  Later, White will be able to scoop out the lower left corner.];
W[pp]
LB[kn:A]
C[White's dead group on the lower side has four liberties, so White can threaten to cut at A while fighting in the lower right corner.];
B[qp];W[qq];B[oq];W[qo];B[rp];W[qr]
(;
B[ro]
C[See the variation.];
W[op]
(;
B[qn]
TR[pq][oq]
C[Black sacrifices the 2 marked lower side stones.  See the variation.];
W[np]
LB[kn:A]
C[Next, White can cut at A.]
(;
B[hq]
C[See the variation.];
W[gr];B[lo];W[bp];B[bo];W[bq];B[dr];W[co];B[cm];W[bn]
LB[ko:A]
C[In the fight after Black's ko threat at A, White took the lower right and lower left corners, and combined with winning the ko in the upper left corner, White's profit was bigger than Black's.];
B[id];W[jd];B[if];W[hd];B[qg];W[pe];B[qb];W[rb]
C[Black has limited space to make life on the upper side.  In playing this attachment, my plan is to chase Black into the center.];
B[qc];W[rc];B[re];W[rd];B[nd];W[of];B[pi];W[me];B[lc];W[kb];B[le];W[md];B[mc];W[ne];B[ld];W[ie]
C[With this move I secure the upper side territory.];
B[lf];W[jf]
C[Reducing Black's center is another of my goals in this upper side fight.];
B[qe];W[od];B[pc];W[nc];B[nb];W[pd];B[ng];W[ph]
(;
B[qh]
C[See the variation.];
W[oh];B[jg];W[ig];B[jh];W[hf];B[mi];W[mh]
(;
B[mg]
C[See the variation.];
W[ni];B[nj];W[mj];B[li];W[oj];B[nk];W[pj];B[qi];W[oi];B[rk];W[qk];B[rl];W[lh]
(;
B[kh]
C[See the variation.];
W[nh];B[lg];W[mk];B[nl];W[ki];B[lj];W[ji];B[ii];W[ih];B[kg];W[ij];B[lk];W[hi];B[nd];W[qj];B[rj];W[nc]
LB[pl:A][ml:B]
C[Black resigns.  White has ko threats such as A or B, and Black cannot win the ko.]
)
    (;
    B[nh]
    C[Black cannot cut here.];
    W[mk];B[nl];W[ki]
    C[White captures two stones in a ladder.]
    )
)
    (;
    B[nh]
    C[Pushing through here is not good for Black.];
    W[oi];B[pj];W[ni];B[mg];W[mj];B[li];W[ok]
    LB[mb:A]
    C[White can play at A to make a ko on the upper side.  So living with this group should be easy for White.]
    )
)
    (;
    B[oh]
    C[Black cannot close White in.];
    W[og]
    LB[nh:A][qh:B]
    C[This move is the tesuji.  A and B are miai.]
    )
)
    (;
    B[bo];W[er];B[dr];W[kn];B[lo];W[ln];B[mo];W[nm]
    TR[ko][lo][mo]
    C[White captures the 3 marked stones.]
    )
)
    (;
    B[np]
    C[Black can escape with the lower side stones, but ...];
    W[no];B[nq];W[mp];B[lo];W[oo];B[mr];W[mo];B[nr];W[rn];B[qn];W[qm];B[pn];W[rm];B[po];W[pm];B[rr];W[lm];B[km];W[mn];B[kn];W[bp];B[bo];W[bq];B[dr];W[co]
    C[... this result is good for White.]
    )
)
    (;
    B[rr]
    C[Black can capture the corner, in which case White will squeeze from the outside.];
    W[op];B[rq];W[nq];B[pr];W[or];B[qs];W[er];B[dr];W[bq];B[dq];W[kn];B[lo];W[ln];B[mo];W[nn];B[no];W[on];B[hq];W[gr];B[es];W[mn];B[hs];W[np];B[gs];W[pf]
    C[After forcing from both sides, White has a good position.]
    )
)
    (;
    B[er]
    C[If Black covers from this side, White will be able to squeeze from the right.];
    W[ip];B[iq];W[hq];B[gs];W[hs];B[fs];W[kr];B[is];W[lq];B[gr]
    LB[kn:A]
    C[White gains several points on the lower side while squeezing Black.  Naturally, White will not play this sequence until exploiting the aji at A first.]
    )
)
    (;
    B[dc];W[kn]
    LB[cb:A]
    C[A very large move.  Black would like to continue with A, but he has no valid ko threats for that ko.]
    )
)
    (;
    W[dm]
    TR[en][fn]
    C[Saving the two White stones is not a good idea.];
    B[fk];W[cj];B[ci];W[ck];B[fj]
    LB[eo:A]
    C[Black now has the initiative in the center fight.  With a forcing move at A, Black's corner is safe.]
    )
)
    (;
    W[bp];B[bo];W[bq];B[co];W[bn];B[an];W[bl];B[gr];W[hr];B[fr];W[hq];B[dr]
    C[White loses the corner semeai.]
    )
)
    (;
    B[bq];W[dp];B[dq];W[cr];B[co];W[eo]
    C[Now Black will lose the semeai.]
    )
    (;
    B[dq]
    C[Also dangerous for Black.];
    W[bp];B[bq];W[cr];B[bo];W[dp];B[co];W[eo]
    C[Black loses.]
    )
)
    (;
    W[dp];B[dq];W[cq];B[co]
    C[Playing this forcing move now is good timing for Black.  White has a choice of how to connect, but will lose the corner semeai in any case.]
    (;
    W[do];B[bq];W[cr];B[br]
    C[Bad for White.]
    )
        (;
        W[eo];B[cr];W[bq];B[br]
        C[Bad for White.]
        )
    )
)
    (;
    B[gq]
    C[This move is clearly bad for Black.];
    W[dq];B[dp];W[fq];B[er];W[hq];B[gr];W[fr];B[fs];W[fp];B[dr];W[hr];B[gs];W[cq];B[cr];W[bq];B[br];W[cn];B[bp];W[jq]
    C[Good for White.]
    )
    (;
    B[hq]
    C[Not so good.  White has a tesuji to squeeze Black in the corner.];
    W[dq];B[dp];W[er];B[fq];W[gq]
    (;
    B[dr];W[fr];B[cq];W[fp];B[cn];W[jq]
    C[Good for White.]
    )
        (;
        B[fp];W[fo];B[fr];W[gr];B[eo];W[fs];B[ep];W[go]
        C[Good for White.]
        )
    )
    (;
    B[fp]
    C[This move is the strongest, but doesn't seem to work.];
    W[fq];B[fo];W[dq];B[er];W[dp];B[dr];W[cq];B[gq];W[cn]
    C[About even, but I prefer White.]
    )
    (;
    B[dp]
    C[I have never seen this in a pro game, but I think this variation is Black's best.];
    W[fq];B[eo];W[fo];B[fp]
    C[White has no ko threat.];
    W[hq];B[ep];W[go];B[fr];W[gq];B[dn];W[em];B[cl]
    C[Assuming a White stone in the lower right corner, this result would favor White, but in this opening I guess it is about even.]
    )
    (;
    B[dq];W[hq];B[iq];W[ip];B[ho];W[jq];B[ir];W[gq];B[jr];W[io]
    LB[hn:A][kq:B]
    C[A and B are miai.  This result is good for White.]
    )
)
    (;
    W[fq];B[dq];W[fp];B[cn]
    TR[hp][en]
    C[Without the two marked stones, this result is a common joseki.  Black has a relatively strong position in the lower side and can attack White, so the marked exchange is profitable for Black.]
    )
)

