Sente: Challenger Koji Tanigawa
   Gote: Osho Yoshiharu Habu
  Event: 46th Osho Match, Game 1
  Dates: 1997 January 9th and 10th
   Site: Kanagawa, Japan 
Opening: Aigakari
 
 1 P2f  P8d    2 P2e   P8e    3 G7h  G3b   4 S3h!? S7b!?  5 P9f  P9d
 6 P2d  P2d    7 R2d   P2c    8 R2h  P8f   9 P8f   R8f   10 P8g  R8d
11 P4f  S8c!? 12 P7f   S7d   13 S4g  S6e  14 G7g   P3d   15 P6f  S7d
16 S7h  S4b   17 S5f   K4a   18 S4e  S3c  19 B9g   P6d!  20 P7e  S6c
21 B8h  G5b   22 G7f   P5d   23 S5f  P5e  24 S56g  S5d   25 G5h  P4d
26 K6h  G54c  27 P8f   B3a   28 S8g  B4b  29 K7h   K3a   30 P3f  R8b
31 B7g  S2b   32 K8h   P2d   33 G6h  S2c  34 G7h   K2b   35 B5i  P1d
36 P1f  R7b   37 P8e   P6e   38 P6e  P7d  39 P7d   P7e   40 G6f  S6c
41 G5e  S7d   42 P4e   B3c   43 B7g  S8e  44 P8f   S7f   45 B6f  P5d
46 P4d  G5c   47 G5f   G4d   48 P2e  P2e  49 P7c   R7c   50 S67f P7f
51 S6d  S5e!? 52 S7c=? S6f   53 G6f  N7c  54 P2d   B2d   55 R4a  B5g+
56 G7f  B5e   57 S6f   B6f   58 G6f  +B6f 59 B7g   +B7g  60 N7g  G*4b!
61 R9a+ N6e   62 P2d   N7g+  63 G7g  S2d  64 P2c   K2c!  65 +R2a S2b
66 R6h  G3a   67 B5a   Gd4c! 68 R6c+ N5c     0-1
diagram After Habu's 51 ... S5e!?

Help Tanigawa find the best move.

Notes:
[Source: Shukan Shogi 97-jan-15]
4 S3h!? A very unusual move.
Tanigawa has played this only once before, against Daisuke Nakagawa (6-dan).
4 P2d is normal.
4 ... S7b!? The obvious 4 ... P8f was played in Tanigawa-Nakagawa, which Tanigawa won.
Habu sidesteps Tanigawa's preparation.
11 ... S8c!? Another unusual development.
Habu brings the silver out from behind the rook.
18 S4e Tanigawa seals an aggressive move.
19 ... P6d! 19 ... G5b 20 P7e S8c [20 ... S8e 21 P8f S9f 22 B8h is out.] loses too much time.
20 P7e If sente snatches the pawn with 20 B6d, gote can play 20 ... G5b,
planning to chase the Bishop back and later attack with ... P9e.
In addition, the 8h square is left weak.
30 ... R8b 30 ... P7d is not playable:
31 P8e R8b 32 P7d S6c 33 G7e R7b 34 G8d S7d [Otherwise 35 P7c+ N7c 36 P7d] P7c.
Both sides continue to improve their position.
37 ... P6e At last the battle begins in earnest.
44 P8f Unpleasant but unavoidable.
Tanigawa would like to be able to play 44 P4d, but then
Habu would have 44 ... P8f! 45 P4c+ P8g+ 46 G8g G4c 47 P4d P8f! (again!) winning.
47 ... G4d The dancing gold picks up the pawn and prepares a countermovement down the long diagonal.
Habu aims at a trade of silvers followed by ... S5e.
51 ... S5e!? Looks strong, but Habu suggested in the post-mortem that perhaps 51 ... R7b was correct.
52 S7c=? Perhaps the losing move.
Best is 52 P2d [52 G5e G5e 53 S5e P5e also favors gote.]
52 ... S2d [Forced. Gote's bishop can not leave the long diagonal.]
53 S7c= S6f 54 G6f G44c 55 G76g N7c 56 S7f and the bulwark is extremely difficult to break.
For example, 56 ... S5e 57 S7g S6f 58 S6f G5e 59 S*7g etc.
60 ... G*4b! Habu returns to the defence at precisely the right moment.
Decisive.

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97 July 3

Patrick Davin
davin [at] shogi [dot] net