51st Oza Match Game 4

[Black "Watanabe Akira, Challenger"]
[White "Habu Yoshiharu, Oza"]
[Event "51st Oza-sen, Game 4"]
[Date "October 7th 2003"]
1.P2g-2f     00:01:00  00:00:00
2.P3c-3d     00:01:00  00:02:00
3.P7g-7f     00:02:00  00:02:00
4.P4c-4d     00:02:00  00:02:00

A surprise after three games with the Yokofudori. Habu seems to be 
aiming at the Furibisha. A brave choice to pick a defensive strategy 
in a game that he can not afford to lose.

5.P2f-2e     00:04:00  00:02:00
6.B2b-3c     00:04:00  00:03:00
7.S3i-4h     00:06:00  00:03:00
8.P9c-9d     00:06:00  00:04:00
9.K5i-6h     00:09:00  00:04:00
10.G6a-5b!?  00:09:00  00:09:00

After seeing 9.K6h, Habu changed his mind and decided to play Yagura 
instead. This is even braver, because at professional level the white 
results with double Yagura have not been very good. Watanabe was 
surprised too: "It really woke me up".

11.G4i-5h    00:27:00  00:09:00
12.G5b-4c    00:27:00  00:16:00
13.S7i-7h    00:29:00  00:16:00
14.G4a-3b    00:29:00  00:36:00
15.P5g-5f    00:34:00  00:36:00
16.S3a-2b    00:34:00  00:40:00
17.S7h-7g    00:35:00  00:40:00
18.K5a-4a    00:35:00  00:42:00
19.K6h-7h    00:37:00  00:42:00
20.B3c-5a    00:37:00  00:43:00
21.B8h-7i    00:39:00  00:43:00
22.S2b-3c    00:39:00  00:43:00
23.P3g-3f    00:41:00  00:43:00
24.P7c-7d    00:41:00  00:48:00
25.P6g-6f    00:45:00  00:48:00
26.B5a-7c    00:45:00  00:54:00
27.S4h-3g    00:49:00  00:54:00
28.S7a-6b    00:49:00  00:56:00
29.G5h-6g    00:58:00  00:56:00
30.K4a-3a    00:58:00  01:05:00
31.K7h-8h    00:59:00  01:05:00
32.P5c-5d    00:59:00  01:11:00
33.G6i-7h    01:00:00  01:11:00
34.S6b-5c    01:00:00  01:12:00
35.S7g-8f!   01:34:00  01:12:00

Diagram 1

In combination with the next move, this is very well judged. In general 
it is a bad idea to move the castle pieces, but this is an exception. 
The first threat is S8e to attack the head of the bishop.

36.P8c-8d    01:34:00  01:39:00
37.N8i-7g!   01:52:00  01:39:00

The threat of a fork on 6e is very nasty. The simple defense is P6d, but 
this closes the vital bishop diagonal and puts bishop and silver in a 
very awkward position. Black has won the opening.

38.B7c-5a    01:52:00  01:50:00
39.B7i-4f    02:01:00  01:50:00
40.N8a-7c    02:01:00  02:14:00
41.N7g-6e    02:18:00  02:14:00
42.S5c-6d    02:18:00  02:20:00
43.N6ex7c+   02:18:00  02:20:00
44.S6dx7c    02:18:00  02:20:00
45.P3f-3e    02:38:00  02:20:00
46.P3dx3e    02:38:00  02:33:00
47.B4fx3e    02:38:00  02:33:00
48.S7c-6d    02:38:00  02:34:00
49.P6f-6e    03:02:00  02:34:00
50.P8d-8e    03:02:00  02:41:00
51.S8f-7g    03:02:00  02:41:00
52.S6d-5c    03:02:00  02:41:00
53.B3e-4f    03:02:00  02:41:00
54.R8b-8a    03:02:00  02:41:00
55.S3g-3f    03:03:00  02:41:00
56.B5a-8d    03:03:00  02:54:00
57.S7g-6f    03:13:00  02:54:00
58.S3c-3d    03:13:00  03:00:00

Diagram 2

A desperate attempt to generate some play. White threatens P3e next, 
but Watanabe is not very concerned.

59.N2i-3g    03:38:00  03:00:00

The textbook Yagura formation. White can try to counter it, but this 
has a high chance of backfiring.

60.P*3e      03:38:00  03:55:00

After 55 minutes, Habu decides to take the plunge. He did not trust 
his own attack, but he saw no alternative.

61.S3fx3e    03:38:00  03:55:00
62.S3dx3e    03:38:00  03:55:00
63.B4fx3e    03:38:00  03:55:00
64.N*8f      03:38:00  03:55:00
65.G7h-7g    03:52:00  03:55:00
66.S*3f      03:52:00  03:57:00
67.B3e-2f!   03:54:00  03:57:00

Diagram 3

Gentle defense. Not only defends the knight on 3g, but also opens the 
square 3e for a knight drop. If black now can get rid of the knight on 
8f, he will win easily.

68.P6c-6d    03:54:00  03:57:00
69.P7f-7e    04:02:00  03:57:00
70.P7dx7e    04:02:00  03:58:00
71.P8gx8f    04:12:00  03:58:00
72.P6dx6e    04:12:00  03:58:00
73.S6fx6e    04:12:00  03:58:00
74.P7e-7f    04:12:00  03:58:00
75.S6ex7f    04:12:00  03:58:00
76.B8d-3i+   04:12:00  03:58:00
77.R2h-7h    04:12:00  03:58:00
78.P8ex8f    04:12:00  04:02:00
79.P*8b      04:14:00  04:02:00
80.R8ax8b    04:14:00  04:03:00
81.P*8c      04:14:00  04:03:00
82.R8bx8c    04:14:00  04:03:00
83.N*7e      04:14:00  04:03:00
84.R8c-8a    04:14:00  04:14:00
85.S*7b      04:14:00  04:14:00
86.P*6f      04:14:00  04:14:00
87.G6g-6h    04:14:00  04:14:00
88.R8a-8b    04:14:00  04:17:00

Diagram 4

No choice. 88.R4a fails to Gx8f and 88.R8d to 89.P*8e R7d S6c= R7a P*7c 
and white can not take this pawn with Rx7c because of N*6e.

89.S7b-8c=?  04:20:00  04:17:00

Now the game suddenly ends in sennichite. Habu thought he would lose 
after 90.N8c+ P*7e +Nx8b Px7f Gx8f S*6g P*3c. Watanabe did not like 
this and decided to try his luck in the replay.

90.R8b-8a    04:20:00  04:18:00
91.S8c-7b=   04:23:00  04:18:00
92.R8a-8b    04:23:00  04:19:00
93.S7b-8c=   04:23:00  04:19:00
94.R8b-8a    04:23:00  04:19:00
95.S8c-7b=   04:23:00  04:19:00
96.R8a-8b    04:23:00  04:19:00
97.S7b-8c=   04:23:00  04:19:00
98.R8b-8a    04:23:00  04:19:00
99.S8c-7b=   04:23:00  04:19:00
Sennichite   04:23:00  04:19:00

Sennichite Diagram