(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black]
;B[dc]
;W[ce]
;B[dh]
;W[fc]
;B[de]LB[cd:B][df:A]TR[de][dh]C[This is a very old pattern.  The classic continuation is at A, it is the natural shape to disrupt the connection between the triangle stones.  Baduk TV was reviewing this position recently, and noted A has fallen out of favor in Korean professional play.  A direct play a B is now the norm.  Follow the variations at A and B to see why.]
(;W[df]
;B[ee]
;W[cd]
;B[ec]
;W[cc]
;B[ef]LB[cf:B][bh:A]C[The classic continuation for white here is tenuki(play elsewhere).  There is no particularly good local follow up for white.  In the end game white would be likely to play A, but this would be too small for the opening.

Therefore, black usually gets to cut and B. See the continuation. ]
(;W[cf])
(;W[pp]
;B[cf]
;W[bf]
;B[cg]
;W[bg]
;B[bh]
;W[ci]C[This peep feels good for white.  However...]
;B[ch]
;W[dq]LB[db:B][eb:C][ag:A]C[This was the classic local ending of the position.  But black A is surprisingingly severe now (follow the continuation).  Therefore white should exchange B for C.  But then black will get to take B in sente later, making black extremely thick.  This thickness is what makes the position not good for white, even though black has played 2 more moves in this corner.]
;B[ag]
;W[be]
;B[cb]
;W[bb]
;B[ba]
;W[db]
;B[da]C[This is ko for white's corner.]))
(;W[cd]
;B[dd]
;W[cc]
;B[df]C[Since white didn't take this vital point, black will take it.]
;W[db]
;B[eb]
;W[cb]LB[ec:A][gc:C][bf:B]TR[eb]C[This position can be though of as the end of the sequence.  White won't want to allow black both A & B, as white would need to play in the corner to live after black gets both these points.  Black can therefor leave the position waiting to see which move will be useful later.  

Even if white cuts at A black is left with the nose tesuji at C to make use of the sacrificed triangle stone.]))
