(;AB[ph]AB[qh]AB[qi]AB[qj]AB[qk]AB[ql]AB[ok]AB[ol]AB[pm]AB[pn]AB[on]AB[nn]AW[om]AW[nm]AW[pl]AW[pk]AW[pj]AW[pi]AW[nj]AW[oh]AW[of]AW[qf]AW[mf]AW[mn]AW[mo]AW[no]AW[oo]AB[og]AW[ng]AB[pg]AW[pf]C[What can Black do in the center?]AP[goproblems] (;B[mm] (;W[nl] (;B[nk];W[ml] (;B[mk];W[ll] (;B[ni]TR[pl]TR[pk]TR[pj]TR[pi]C[The sweet smell of tesuji in the morning...RIGHT]) (;B[oj];W[oi] (;B[nh];W[ni] (;B[mh];W[mj]C[White escapes]) (;B[mi];W[mh]) (;B[mj];W[mh])) (;B[ni];W[nh]) (;B[mh];W[nh]) (;B[mi];W[ni])) (;B[oi];W[oj] (;B[ni];W[mj]C[You can capture one stone but you fortified White's position in the center.]) (;B[mj];W[ni]) (;B[mi];W[ni]) (;B[nh];W[mi] (;B[mg];W[mh]C[White saves the center.]) (;B[mj];W[ni] (;B[oh];W[mh]) (;B[mh];W[li] (;B[oh];W[lh]) (;B[lh];W[oh])) (;B[li];W[mh]C[White seals off the center. Black's N10 stones are just a cumbersome eyeless lump in White's moyo.])) (;B[mh];W[li]C[Black breaks through but fails to take the bonus.])) (;B[mh];W[nh])) (;B[mj];W[ni]) (;B[mi];W[ni]) (;B[nh];W[ni] (;B[oi];W[oj] (;B[mi];W[oh] (;B[mj];W[mh]) (;B[mh];W[mj]) (;B[lm];W[mh]C[Poor eyeless Black stones, swimming in a powerful White center...])) (;B[oh];W[mj]) (;B[mj];W[mi] (;B[oh];W[mh]) (;B[mh];W[li] (;B[oh];W[lh]) (;B[lh];W[oh])) (;B[li];W[mh]C[White seals off the center. Black's N10 stones are just a cumbersome eyeless lump in White's moyo.])) (;B[mg];W[lj]C[Black breaks through but White saves her stones and builds up strength in the lower center.])) (;B[oj];W[oi] (;B[mh];W[mj]C[White escapes]) (;B[mi];W[mh]) (;B[mj];W[mh])) (;B[mh];W[mj] (;B[oi];W[oj] (;B[lj];W[lk]) (;B[lk];W[li]C[White retains most of the center. The maked stones are eyeless and vulnerable in White's strong center.]MA[lk]MA[mk]MA[nk]MA[ok]MA[ol])) (;B[lk];W[li]C[White retains most of the center. The maked stones are eyeless and vulnerable in White's strong center.]MA[lk]MA[mk]MA[nk]MA[ok]MA[ol])) (;B[mj];W[mh]) (;B[mi];W[mh])) (;B[mh];W[nh]) (;B[lk];W[ni])) (;B[oi];W[oj] (;B[nh];W[mk]C[Capturing a stone and breaching the center is nice, but not the best you can do.]) (;B[ni];W[mj] (;B[nh];W[mh]C[You captured a stone! Pity that White has such a solid wall now.]) (;B[mi];W[nh])) (;B[mk];W[ll] (;B[ni];W[mj]C[You can capture one stone but you fortified White's position in the center.]) (;B[mj];W[ni]) (;B[mi];W[ni]) (;B[nh];W[mi] (;B[mg];W[mh]C[White saves the center.]) (;B[mj];W[ni] (;B[oh];W[mh]) (;B[mh];W[li] (;B[oh];W[lh]) (;B[lh];W[oh])) (;B[li];W[mh]C[White seals off the center. Black's N10 stones are just a cumbersome eyeless lump in White's moyo.])) (;B[mh];W[li]C[Black breaks through but fails to take the bonus.])) (;B[mh];W[nh])) (;B[mi];W[ni])) (;B[oj];W[oi] (;B[mk];W[ll] (;B[nh];W[ni] (;B[mh];W[mj]C[White escapes]) (;B[mi];W[mh]) (;B[mj];W[mh])) (;B[ni];W[nh]) (;B[mh];W[nh]) (;B[mi];W[ni])) (;B[ni];W[mk]) (;B[nh];W[mk]) (;B[mi];W[mk])) (;B[nh];W[ni] (;B[mk];W[ll] (;B[oi];W[oj] (;B[mi];W[oh] (;B[mj];W[mh]) (;B[mh];W[mj]) (;B[lm];W[mh]C[Poor eyeless Black stones, swimming in a powerful White center...])) (;B[oh];W[mj]) (;B[mj];W[mi]) (;B[mg];W[lj]C[Black breaks through but White saves her stones and builds up strength in the lower center.])) (;B[oj];W[oi]) (;B[mh];W[mj] (;B[oi];W[oj] (;B[lj];W[lk]) (;B[lk];W[li]C[White retains most of the center. The maked stones are eyeless and vulnerable in White's strong center.]MA[lk]MA[mk]MA[nk]MA[ok]MA[ol])) (;B[lk];W[li]C[White retains most of the center. The maked stones are eyeless and vulnerable in White's strong center.]MA[lk]MA[mk]MA[nk]MA[ok]MA[ol])) (;B[mj];W[mh]) (;B[mi];W[mh])) (;B[oi];W[oj] (;B[mk];W[ll] (;B[mi];W[oh] (;B[mj];W[mh]) (;B[mh];W[mj]) (;B[lm];W[mh]C[Poor eyeless Black stones, swimming in a powerful White center...])) (;B[oh];W[mj]) (;B[mj];W[mi]) (;B[mg];W[lj]C[Black breaks through but White saves her stones and builds up strength in the lower center.])) (;B[oh];W[mk]) (;B[mh];W[mk])) (;B[oj];W[oi] (;B[mk];W[ll] (;B[mh];W[mj]C[White escapes]) (;B[mi];W[mh]) (;B[mj];W[mh])) (;B[mh];W[mk]))) (;B[ni];W[mk] (;B[nh];W[oj]C[You can capture a stone, but it is not enough.]) (;B[oi];W[oj]C[There is a stone for you. White is content with the strength in the center.]) (;B[oj];W[oi]) (;B[mj];W[nh])) (;B[mj];W[ni];B[mk];W[ll]) (;B[mi];W[ni]) (;B[ll];W[mk])) (;B[oi];W[oj] (;B[nh];W[mh]C[Just a stone.]) (;B[ni];W[mi] (;B[nh];W[mh] (;B[oh]C[One stone in gote.]) (;B[ml];W[nk])) (;B[ml];W[nk])) (;B[ml];W[nk] (;B[nh];W[mh]C[Just one stone, White is massive in the center.]) (;B[ni];W[mi])) (;B[nk];W[mk])) (;B[nh];W[oj] (;B[oi];W[mh]C[Just a stone.]) (;B[ml];W[nk] (;B[oi];W[mh]C[Just one stone, White is massive in the center.]) (;B[mi];W[mh] (;B[oi];W[ni];B[oh];W[lk]) (;B[ni];W[oi] (;B[lh];W[mg] (;B[mj];W[mk];B[lk];W[ll];B[lm];W[lj]) (;B[mk];W[mj])) (;B[mj];W[mk] (;B[lk];W[ll];B[lm];W[lj]) (;B[lh];W[mg];B[lk];W[ll];B[lm];W[lj])) (;B[mk];W[mj])) (;B[lh];W[ni])))) (;B[oj];W[oi]) (;B[ni];W[oj]) (;B[mj];W[nk]) (;B[mk];W[nk]) (;B[ml];W[nk] (;B[oi];W[oj] (;B[nh];W[mh]C[Just one stone, White is massive in the center.]) (;B[ni];W[mi])) (;B[oj];W[oi]) (;B[nh];W[oi]) (;B[ni];W[nh]))) (;W[oj];B[ml]C[White can save the 4 stones at the Q line like this, but Black's strong position completely erases White's strength in the center.RIGHT]) (;W[lm];B[ml];W[ll];B[mk];W[lk];B[mj];W[lj];B[ni]C[White can shield off the center but pays a hefty price.RIGHT]TR[nj]TR[nm]TR[om]TR[pl]TR[pk]TR[pj]TR[pi])) (;B[ml];W[mm] (;B[oi];W[oj] (;B[nh];W[mh]) (;B[ni];W[mi])) (;B[oj];W[oi]) (;B[nh];W[oj];B[oi];W[mh]) (;B[ni];W[oj]) (;B[mk];W[ni])) (;B[mk];W[ml] (;B[oi];W[oj] (;B[ni];W[mi]) (;B[nh];W[mh])) (;B[oj];W[oi]) (;B[ni];W[oj]) (;B[nh];W[ni]) (;B[nk];W[ni])) (;B[nk];W[mk] (;B[mm];W[lm] (;B[nl];W[ni] (;B[mj];W[ml];B[nm]) (;B[ml];W[ll]C[White gladly sacrifices 2 stones to maintain that solid center-facing wall.])) (;B[ml];W[ll] (;B[nl];W[ni]C[White gladly sacrifices 2 stones to maintain that solid center-facing wall.]) (;B[oi];W[oj] (;B[nl];W[ni]) (;B[nh];W[nl])) (;B[oj];W[oi];B[nl];W[mj]) (;B[mj];W[nl]) (;B[ni];W[nl])) (;B[oi];W[oj]) (;B[oj];W[oi])) (;B[oi];W[oj]) (;B[nl];W[mm]) (;B[ni];W[oj]) (;B[oj];W[oi]) (;B[ml];W[mm])) (;B[nl];W[mm] (;B[oi];W[oj];B[nh];W[mh]C[Just a single stone.]) (;B[oj];W[oi]) (;B[nh];W[oj] (;B[oi];W[mh]C[Just a single stone.]) (;B[ni];W[mh] (;B[oi];W[mi]C[Just one stone.]) (;B[mi];W[mj] (;B[li];W[oi]MA[nl]MA[ol]MA[ok]) (;B[oi];W[li]C[Just one stone.]) (;B[lh];W[oi]MA[nl]MA[ol]MA[ok])) (;B[mj];W[mi])) (;B[mk];W[mh]C[You can capture one stone in gote.])) (;B[ni];W[nh]) (;B[mk];W[ni]MA[mk]MA[nl]MA[ol]MA[ok]C[Black has made an eyeless lump inside White's moyo.])) (;B[oj];W[oi] (;B[mm];W[nl]) (;B[nk];W[mk]) (;B[nl];W[mm]) (;B[ni];W[nh] (;B[mm];W[nl]) (;B[nk];W[mk] (;B[mj];W[nl] (;B[nj];W[lj]) (;B[ml];W[nj]) (;B[mm];W[nj])) (;B[mm];W[nl])) (;B[nl];W[mm]) (;B[ml];W[nl])) (;B[mk];W[nk]) (;B[ml];W[nl]) (;B[nh];W[ni])) (;B[oi];W[oj] (;B[ni];W[mj]C[Black can only capture one stone, White's center remains strong.]) (;B[mm];W[nl] (;B[nh];W[mh]C[Just a stone.]) (;B[ni];W[mi] (;B[nh];W[mh] (;B[oh]C[One stone in gote.]) (;B[ml];W[nk])) (;B[ml];W[nk])) (;B[ml];W[nk] (;B[nh];W[mh]C[Just one stone, White is massive in the center.]) (;B[ni];W[mi])) (;B[nk];W[mk])) (;B[nh];W[mh]C[Just a single stone; White's center wall is unbreached.]) (;B[nl];W[mm];B[nh];W[mh]C[Just a single stone.])) (;B[ni];W[oj] (;B[oi];W[mj]C[Black can only capture one stone, White's center remains strong.]) (;B[mm];W[nl]) (;B[nl];W[mm] (;B[mj];W[nh]) (;B[oi];W[mi]C[Just one stone.]) (;B[nh];W[mh] (;B[oi];W[mi]C[Just one stone.]) (;B[mi];W[mj] (;B[li];W[oi]MA[nl]MA[ol]MA[ok]) (;B[oi];W[li]C[Just one stone.]) (;B[lh];W[oi]MA[nl]MA[ol]MA[ok])) (;B[mj];W[mi]))) (;B[nh];W[mj]C[You can catch one stone, but White's center remains intact.]) (;B[mj];W[nk])) (;B[nh];W[oj] (;B[oi];W[mh]C[Just a single stone; White's center wall is unbreached.]) (;B[nl];W[mm] (;B[oi]) (;B[ni];W[mh] (;B[oi];W[mi]C[Just one stone.]) (;B[mi];W[mj] (;B[li];W[oi]MA[nl]MA[ol]MA[ok]) (;B[oi];W[li]C[Just one stone.]) (;B[lh];W[oi]MA[nl]MA[ol]MA[ok])) (;B[mj];W[mi])) (;B[mk];W[mh]C[You can capture one stone in gote.])) (;B[mm];W[nl] (;B[oi]) (;B[ml];W[nk] (;B[oi]) (;B[mi];W[mh] (;B[oi];W[ni];B[oh];W[lk]) (;B[ni];W[oi] (;B[lh];W[mg] (;B[mj];W[mk];B[lk];W[ll];B[lm];W[lj]) (;B[mk];W[mj])) (;B[mj];W[mk] (;B[lk];W[ll];B[lm];W[lj]) (;B[lh];W[mg])) (;B[mk];W[mj])) (;B[lh];W[ni]))))))