[go]$$Bc $$ ----------------- $$ . . . . X . . . | $$ . X . X O X O . | $$ . . X . O . . . | $$ . . . O , O O . | $$ . . X O O O X . | $$ . . X X X X X . | $$ . . . . . . . . |[/go]
[go]$$Bc $$ | . . . . . . . $$ | X X X X . . . $$ | O . . O X . . $$ | O . . O X . . $$ | . . . O X . . $$ | . O . O X . . $$ | . O . X . X . $$ | . . O X . . . $$ --------------[/go]
[go]$$B $$ ----------------- $$ . . . . X 4 3 . | $$ . X . X O X O . | $$ . . X . O 1 2 . | $$ . . . O , O O . | $$ . . X O O O X . | $$ . . X X X X X . | $$ . . . . . . . . |[/go]
[go]$$B W dies $$ ----------------- $$ . . . . X . X . | $$ . X . X O 5 O . | $$ . . X . O . O . | $$ . . . O , O O . | $$ . . X O O O X . | $$ . . X X X X X . | $$ . . . . . . . . |[/go]
[go]$$B (a) & (b) seem miai... $$ ----------------- $$ . . . . X . . . | $$ . X . X O X O . | $$ . . X b O 1 a . | $$ . . . O , O O . | $$ . . X O O O X . | $$ . . X X X X X . | $$ . . . . . . . . |[/go]
[go]$$B (c) & (d) miai $$ ----------------- $$ . . . . X 5 3 . | $$ . X . X O X O 4 | $$ . . X d O 1 2 . | $$ . . . O , O O c | $$ . . X O O O X . | $$ . . X X X X X . | $$ . . . . . . . . |[/go]
[go]$$B $$ | . . . . . . . $$ | X X X X . . . $$ | O . . O X . . $$ | O . . O X . . $$ | . . . O X . . $$ | . O . O X . . $$ | . O 1 X . X . $$ | . . O X . . . $$ ---------------[/go]
[go]$$B $$ | . . . . . . . $$ | X X X X . . . $$ | O . . O X . . $$ | O 1 . O X . . $$ | . . . O X . . $$ | . O . O X . . $$ | . O . X . X . $$ | . . O X . . . $$ ---------------[/go]
below is also interesting. White tries to create the alternative of an eye in the middle of the board to play/protect the vital point at B5 in sente (in order to live by then connecting at B1). However, allows Black to play B5. If White tries , continues to threaten B5. If White plays "a" instead, Black answers with "b" still threatening B5. If White tries "b" instead, Black plays "a" and can still follow up with B5! Personally I found this more interesting than the tesuji, which I learned from a dull tsumego book.
Needless to say, if Kirby has some other clever resource for White, I was too lazy to find it as usual!
_________________ Dave Sigaty "Short-lived are both the praiser and the praised, and rememberer and the remembered..." - Marcus Aurelius; Meditations, VIII 21
Solutions and updated leader board are given below.
Problem 1
(;GM[1]FF[4]CA[UTF-8]AP[WebGoBoard:0.10.8]ST[0]SZ[19]KM[6.5]HA[0]PB[Black]PW[White]AB[ae][be][cd][dd][ed][ec][eb][ea][da]AW[ca][db][dc][cc][bc][bd][ad]C[Problem 1: Black kills.](;B[bb]C[Black B18 kills white!];W[ab]C[White appears to make a second eye at A17.];B[ba]C[Black connects out with B19! White cannot connect at C18.];W[cb];B[ac]C[Black kills white.])(;B[ba];W[bb];B[cb]C[Ko is not good enough.]))
Problem 2
(;GM[1]FF[4]CA[UTF-8]AP[WebGoBoard:0.10.8]ST[0]SZ[19]KM[6.5]HA[0]PB[Black]PW[White]AB[qb][pa][ob][nc][mb][ne][nf][of][pf][qf][rf][re]AW[rb][rd][qd][qe][pe][oe][od][pc][pb]C[Problem 2: Black kills.](;B[qc]C[Black R17 is the key move.];W[rc]C[White appears to have secured an eye around T18 in sente, but...];B[ra]C[Black's move at S19 is a clever way to prevent white from getting eyespace.];W[qa];B[qb]C[White is dead.])(;B[ra];W[qc]C[Ko is not enough.]))
Problem 3
(;GM[1]FF[4]CA[UTF-8]AP[WebGoBoard:0.10.8]ST[0]SZ[19]KM[6.5]HA[0]PB[Black]PW[White]AB[ds][dr][eq][fr][ep][eo][en][dm][cm][am][bm]AW[an][ao][dn][do][dp][dq][cs][br][bq]C[Problem 3: Black kills.](;B[cr]C[Reducing at C2 is the key move.](;W[cn](;B[cq];W[cp];B[bo];W[bn];B[bp];W[ap](;B[ar];W[bs];B[aq];W[as];B[aq];W[co];B[bp]C[White is dead!])(;B[bs];W[ar]C[Black fails.]))(;B[bs];W[ar]C[Black fails.])(;B[bo];W[bn];B[bp];W[cq];B[bs];W[ar];B[ap];W[cp]C[Seki.]))(;W[bp];B[cq];W[cp];B[cn]C[Black kills.]))(;B[bo];W[bp];B[co];W[cr];B[cp];W[as]C[White is alive.]))
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Kirby
below is also interesting. White tries to create the alternative of an eye in the middle of the board to play/protect the vital point at B5 in sente (in order to live by then connecting at B1). However, 
allows Black to play B5. If White tries 
, 
continues to threaten B5. If White plays "a" instead, Black answers with "b" still threatening B5. If White tries "b" instead, Black plays "a" and can still follow up with B5! Personally I found this more interesting than the tesuji, which I learned from a dull tsumego book. 