Usenet 1994 October/usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso/games/volume8/mgt/part01/go-files/h13.s

Text File | 1990-02-23 | 5KB | 333 lines

(
;
GaMe[1]
SiZe[19]
VieW[]
BlackSpec[1]
WhiteSpec[1]
FileFormat[1]
AddWhite[pd][pc][qe][jd]
AddBlack[qc][qd][nc]
GameName[13hamete]
Comment[h13.s
The White 'hane' at 'r15' is hamete.  How should Black respond?

Solution follows.]
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AddEmpty[jd][nc][pc][qc][qd][qe]
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Black[nc]
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White[jd]
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Black[qc]
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White[pc]
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Black[qd]
(
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White[qe]
KO[]
Comment[The sequence Black one at 'o17' through White six at 'r15' is how the
sequence begins.]
)
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White[pe]
Comment[White six at 'q15' is the normal joseki move.  The following sequence
illustrates the usual joseki.]
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Black[pb]
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White[ob]
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Black[qb]
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White[oc]
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Black[qf]
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White[nd]
Comment[This exchange is the normal joseki, and it is considered optimal for
White and Black.]
)
)
(
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Black[re]
Comment[Black one at 's15' would be the natural response.  However if we
compare the ending result with the normal joseki sequence, Black 's position is
inferior.]
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White[qf]
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Black[rf]
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White[qg]
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Black[pb]
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White[ob]
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Black[qb]
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White[oc]
Comment[After this exchange, White's position is far better than Black's.]
)
(
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Black[pe]
Comment[Black one at 'q15' is an attempt to stay on the outside, and to
threaten the two White stones at 'q16' & 'q17'.  However the White stones are
not so easily captured.]
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White[qb]
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Black[rb]
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White[pb]
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Black[re]
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White[qf]
(
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Black[oe]
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White[rf]
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Black[ra]
(
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White[se]
Comment[White at 't15' is the proper tesuji.]
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Black[rc]
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White[nb]
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Black[mb]
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White[mc]
(
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Black[nd]
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White[ob]
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Black[lb]
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White[sc]
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Black[na]
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White[rd]
Comment[Black loses.]
)
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Black[md]
Comment[If Black plays 'n16', instead of 'm18', his chances are only a little
better than before.  The sequence will end in 'ko' rather than a complete
failure. ]
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White[lc]
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Black[ob]
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White[nd]
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Black[na]
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White[ne]
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Black[od]
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White[oc]
Comment[The result is 'ko'.  This sequence is to Whites advantage for two main
reasons.  First, White may choose not to play the ko battle and lock Black in
the corner by playing at 'p14', giving White a very strong outside stance.
Second, Black's first move is incorrect, and Black has a better move other than
the ko battle.]
Letter[of]
)
)
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White[rd]
Comment[Previously I said that White at 't15' was the proper tesuji.  Let us
examine what might happen when White plays the usual move illustrated at White
's16'.]
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Black[rc]
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White[se]
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Black[ob]
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White[sc]
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Black[pa]
Comment[White loses.]
)
)
(
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Black[rf]
Comment[Black seven at 's14', instead of Black seven at 'p15', is also bad for
Black.]
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White[oe]
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Black[pf]
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White[qg]
(
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Black[of]
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White[ra]
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Black[rc]
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White[qi]
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Black[rg]
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White[rh]
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Black[ph]
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White[qh]
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Black[sg]
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White[nd]
Comment[After this exchange, Black lives in the corner.  However Black's
stance on the outside is very weak. ]
)
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Black[pg]
Comment[Black at 'q13', instead of Black at 'p14', is not much better.]
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White[qh]
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Black[ph]
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White[qi]
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Black[pi]
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White[qj]
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Black[od]
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White[ra]
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Black[rc]
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White[nb]
Comment[This exchange is bad for Black.  Perhaps you can figure this one for yourself.
One hint, don't forget the cross cut.]
)
)
)
(
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Black[qb]
Comment[Black one at 'r18' is a poor move choice.]
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White[pe]
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Black[pb]
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White[qi]
Comment[White's position is better.  White still has good potential to develop
further territory, while Black is limited to the corner.]
)
(
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Black[pb]
Comment[Black one at 'q18' is the correct response.]
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White[ob]
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Black[qb]
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White[oc]
Comment[At this juncture the next Black play is very difficult to find.  Try
examining this position before proceeding. ]
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Black[qf]
Comment[Black five at 'r14' is a very difficult play to find.  If you found
this move, I would say that you have a good understanding of tesuji, and move transpositions.]
(
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White[pe]
;
Black[re]
Comment[This position is almost identical to the joseki sequence previously
mentioned in the beginning of our discussion.   However, there is now an extra White stone at 'r15',  transposing the position.
In the joseki sequence White does not play the move at 'r15'.  The difference is subtle, as White 'r15' is a wasted move so is no longer a ko
threat.]
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AddWhite[nd]
AddEmpty[qe][re]
Comment[Again this is the joseki pattern.  Compare this with the previous
diagram.]
)
(
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White[re]
Comment[White six at 's15' instead is a losing move.]
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Black[pe]
(
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White[rf]
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Black[oe]
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White[nb]
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Black[qg]
Comment[White loses one side or the other, or he can crawl along the edge on
the second line.  A difficult decision for White.  ]
)
(
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White[oe]
Comment[White at 'p15', instead of White at 's14', also loses.]
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Black[pf]
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White[rf]
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Black[nb]
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White[oa]
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Black[of]
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White[ne]
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Black[rg]
Comment[The three White stones at 's14, s15, and 'r15' are dead, and Black's
position is superior to White's.]
)
(
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White[qg]
Comment[White at 'r13' doesn't help either.  White still loses.]
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Black[oe]
Comment[White will either lose the four stones on the upper portion of the
board, or the two White stones on the right.]
)
)
)
)